CVE-2026-64436

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64436", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.787Z", "datePublished": "2026-07-25T08:51:10.370Z", "dateUpdated": "2026-10-19T20:38:28.893Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:55:37.549Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: af_key: initialize alg_key_len for IPComp states\n\npfkey_msg2xfrm_state() handles the IPComp (SADB_X_SATYPE_IPCOMP) case by\nallocating x->calg and copying only the algorithm name:\n\n\tx->calg = kmalloc_obj(*x->calg);\n\tif (!x->calg) {\n\t\terr = -ENOMEM;\n\t\tgoto out;\n\t}\n\tstrcpy(x->calg->alg_name, a->name);\n\tx->props.calgo = sa->sadb_sa_encrypt;\n\nUnlike the authentication (x->aalg) and encryption (x->ealg) branches of\nthe same function, the compression branch never initializes\ncalg->alg_key_len. IPComp carries no key and the allocation only\nreserves sizeof(struct xfrm_algo) (i.e. no room for a key), so the field\nis left containing uninitialized slab data.\n\ncalg->alg_key_len is later used as a length by xfrm_algo_clone() when an\nIPComp state is cloned during XFRM_MSG_MIGRATE:\n\n\txfrm_state_migrate()\n\t xfrm_state_clone_and_setup()\n\t x->calg = xfrm_algo_clone(orig->calg);\n\t kmemdup(orig, xfrm_alg_len(orig));\n\nwhere xfrm_alg_len() returns sizeof(*alg) + (alg_key_len + 7) / 8. With\na non-zero garbage alg_key_len, kmemdup() reads past the end of the\n68-byte calg object. Adding an IPComp SA via PF_KEY and then migrating\nit triggers (net-next, KASAN, init_on_alloc=0):\n\n BUG: KASAN: slab-out-of-bounds in kmemdup_noprof+0x44/0x60\n Read of size 4164 at addr ff11000025a74980 by task diag2/9287\n CPU: 3 UID: 0 PID: 9287 Comm: diag2 7.1.0-rc6-g903db046d557 #1\n Call Trace:\n <TASK>\n dump_stack_lvl+0x10e/0x1f0\n print_report+0xf7/0x600\n kasan_report+0xe4/0x120\n kasan_check_range+0x105/0x1b0\n __asan_memcpy+0x23/0x60\n kmemdup_noprof+0x44/0x60\n xfrm_state_migrate+0x70a/0x1da0\n xfrm_migrate+0x753/0x18a0\n xfrm_do_migrate+0xb47/0xf10\n xfrm_user_rcv_msg+0x411/0xb50\n netlink_rcv_skb+0x158/0x420\n xfrm_netlink_rcv+0x71/0x90\n netlink_unicast+0x584/0x850\n netlink_sendmsg+0x8b0/0xdc0\n ____sys_sendmsg+0x9f7/0xb90\n ___sys_sendmsg+0x134/0x1d0\n __sys_sendmsg+0x16d/0x220\n do_syscall_64+0x116/0x7d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n </TASK>\n\n Allocated by task 9287:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n pfkey_add+0x2652/0x2ea0\n pfkey_process+0x6d0/0x830\n pfkey_sendmsg+0x42c/0x850\n __sys_sendto+0x461/0x4b0\n __x64_sys_sendto+0xe0/0x1c0\n do_syscall_64+0x116/0x7d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n The buggy address belongs to the object at ff11000025a74980\n which belongs to the cache kmalloc-96 of size 96\n The buggy address is located 0 bytes inside of\n allocated 68-byte region [ff11000025a74980, ff11000025a749c4)\n\nDepending on the uninitialized value the same field can instead request\nan oversized kmemdup() allocation and make the migration clone fail.\n\nThe XFRM netlink path is not affected: verify_one_alg() rejects an\nXFRMA_ALG_COMP attribute shorter than xfrm_alg_len(), so a calg added via\nXFRM_MSG_NEWSA is always self-consistent.\n\nInitialize calg->alg_key_len to 0, matching the aalg/ealg branches."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local PF_KEY and XFRM netlink messages; received IPComp network packets cannot create or migrate the vulnerable state.\nAC:L - The attacker can deterministically prime the same kmalloc-96 cache and control the stale length before triggering migration. No race or victim-controlled condition is required.\nPR:L - Both paths require CAP_NET_ADMIN relative to the network namespace's owning user namespace. An unprivileged user can obtain this capability in a newly created user and network namespace.\nUI:N - No victim action is required after the attacker gains local execution and submits the crafted state and migration messages.\nS:U - The vulnerability affects the host kernel within its existing security authority and does not cross a VM, IOMMU, or equivalent scope boundary.\nC:H - The controlled length causes a potentially large out-of-bounds read across adjacent kernel heap objects, which can capture sensitive kernel memory and is not tightly bounded.\nI:N - kmemdup allocates a destination matching the computed length, and the vulnerable operation only over-reads the source. No out-of-bounds write or control-flow modification path was identified.\nA:H - The over-read can trigger a kernel fault or panic under memory-safety enforcement. Controlled oversized clone allocations can also be repeated across states to exhaust kernel memory."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/key/af_key.c"], "versions": [{"version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "58e82fc3dedb57b1432292504415b224fd2d6acb", "status": "affected", "versionType": "git"}, {"version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "01b9115b55018123ef2449ac4951f89147a8428e", "status": "affected", "versionType": "git"}, {"version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "3f63d1752d90c0e28be931a48ab5d89bc97d637d", "status": "affected", "versionType": "git"}, {"version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "273c06b81d2e902b21acc801ae18c8276c8a9b69", "status": "affected", "versionType": "git"}, {"version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "6de2a650917bedaaefd65b17cede83c5e2c1dedd", "status": "affected", "versionType": "git"}, {"version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "e8417353cbd078d10531ba3928e609c84ab09e6b", "status": "affected", "versionType": "git"}, {"version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e", "status": "affected", "versionType": "git"}, {"version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "d129c3177d7b1138fd5066fcc63a698b3ba415b0", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/key/af_key.c"], "versions": [{"version": "2.6.21", "status": "affected"}, {"version": "0", "lessThan": "2.6.21", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/58e82fc3dedb57b1432292504415b224fd2d6acb"}, {"url": "https://git.kernel.org/stable/c/01b9115b55018123ef2449ac4951f89147a8428e"}, {"url": "https://git.kernel.org/stable/c/3f63d1752d90c0e28be931a48ab5d89bc97d637d"}, {"url": "https://git.kernel.org/stable/c/273c06b81d2e902b21acc801ae18c8276c8a9b69"}, {"url": "https://git.kernel.org/stable/c/6de2a650917bedaaefd65b17cede83c5e2c1dedd"}, {"url": "https://git.kernel.org/stable/c/e8417353cbd078d10531ba3928e609c84ab09e6b"}, {"url": "https://git.kernel.org/stable/c/cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e"}, {"url": "https://git.kernel.org/stable/c/d129c3177d7b1138fd5066fcc63a698b3ba415b0"}], "title": "net: af_key: initialize alg_key_len for IPComp states", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64436", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:40:40.992032Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-119", "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:38:28.893Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64436", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:40:40.992032Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-119", "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:40:41.570Z"}}], "cna": {"title": "net: af_key: initialize alg_key_len for IPComp states", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.1, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local PF_KEY and XFRM netlink messages; received IPComp network packets cannot create or migrate the vulnerable state.\nAC:L - The attacker can deterministically prime the same kmalloc-96 cache and control the stale length before triggering migration. No race or victim-controlled condition is required.\nPR:L - Both paths require CAP_NET_ADMIN relative to the network namespace's owning user namespace. An unprivileged user can obtain this capability in a newly created user and network namespace.\nUI:N - No victim action is required after the attacker gains local execution and submits the crafted state and migration messages.\nS:U - The vulnerability affects the host kernel within its existing security authority and does not cross a VM, IOMMU, or equivalent scope boundary.\nC:H - The controlled length causes a potentially large out-of-bounds read across adjacent kernel heap objects, which can capture sensitive kernel memory and is not tightly bounded.\nI:N - kmemdup allocates a destination matching the computed length, and the vulnerable operation only over-reads the source. No out-of-bounds write or control-flow modification path was identified.\nA:H - The over-read can trigger a kernel fault or panic under memory-safety enforcement. Controlled oversized clone allocations can also be repeated across states to exhaust kernel memory."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "58e82fc3dedb57b1432292504415b224fd2d6acb", "versionType": "git"}, {"status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "01b9115b55018123ef2449ac4951f89147a8428e", "versionType": "git"}, {"status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "3f63d1752d90c0e28be931a48ab5d89bc97d637d", "versionType": "git"}, {"status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "273c06b81d2e902b21acc801ae18c8276c8a9b69", "versionType": "git"}, {"status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "6de2a650917bedaaefd65b17cede83c5e2c1dedd", "versionType": "git"}, {"status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "e8417353cbd078d10531ba3928e609c84ab09e6b", "versionType": "git"}, {"status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e", "versionType": "git"}, {"status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "lessThan": "d129c3177d7b1138fd5066fcc63a698b3ba415b0", "versionType": "git"}], "programFiles": ["net/key/af_key.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.21"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.21", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.96", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.39", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.4", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/key/af_key.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/58e82fc3dedb57b1432292504415b224fd2d6acb"}, {"url": "https://git.kernel.org/stable/c/01b9115b55018123ef2449ac4951f89147a8428e"}, {"url": "https://git.kernel.org/stable/c/3f63d1752d90c0e28be931a48ab5d89bc97d637d"}, {"url": "https://git.kernel.org/stable/c/273c06b81d2e902b21acc801ae18c8276c8a9b69"}, {"url": "https://git.kernel.org/stable/c/6de2a650917bedaaefd65b17cede83c5e2c1dedd"}, {"url": "https://git.kernel.org/stable/c/e8417353cbd078d10531ba3928e609c84ab09e6b"}, {"url": "https://git.kernel.org/stable/c/cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e"}, {"url": "https://git.kernel.org/stable/c/d129c3177d7b1138fd5066fcc63a698b3ba415b0"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: af_key: initialize alg_key_len for IPComp states\n\npfkey_msg2xfrm_state() handles the IPComp (SADB_X_SATYPE_IPCOMP) case by\nallocating x->calg and copying only the algorithm name:\n\n\tx->calg = kmalloc_obj(*x->calg);\n\tif (!x->calg) {\n\t\terr = -ENOMEM;\n\t\tgoto out;\n\t}\n\tstrcpy(x->calg->alg_name, a->name);\n\tx->props.calgo = sa->sadb_sa_encrypt;\n\nUnlike the authentication (x->aalg) and encryption (x->ealg) branches of\nthe same function, the compression branch never initializes\ncalg->alg_key_len. IPComp carries no key and the allocation only\nreserves sizeof(struct xfrm_algo) (i.e. no room for a key), so the field\nis left containing uninitialized slab data.\n\ncalg->alg_key_len is later used as a length by xfrm_algo_clone() when an\nIPComp state is cloned during XFRM_MSG_MIGRATE:\n\n\txfrm_state_migrate()\n\t xfrm_state_clone_and_setup()\n\t x->calg = xfrm_algo_clone(orig->calg);\n\t kmemdup(orig, xfrm_alg_len(orig));\n\nwhere xfrm_alg_len() returns sizeof(*alg) + (alg_key_len + 7) / 8. With\na non-zero garbage alg_key_len, kmemdup() reads past the end of the\n68-byte calg object. Adding an IPComp SA via PF_KEY and then migrating\nit triggers (net-next, KASAN, init_on_alloc=0):\n\n BUG: KASAN: slab-out-of-bounds in kmemdup_noprof+0x44/0x60\n Read of size 4164 at addr ff11000025a74980 by task diag2/9287\n CPU: 3 UID: 0 PID: 9287 Comm: diag2 7.1.0-rc6-g903db046d557 #1\n Call Trace:\n <TASK>\n dump_stack_lvl+0x10e/0x1f0\n print_report+0xf7/0x600\n kasan_report+0xe4/0x120\n kasan_check_range+0x105/0x1b0\n __asan_memcpy+0x23/0x60\n kmemdup_noprof+0x44/0x60\n xfrm_state_migrate+0x70a/0x1da0\n xfrm_migrate+0x753/0x18a0\n xfrm_do_migrate+0xb47/0xf10\n xfrm_user_rcv_msg+0x411/0xb50\n netlink_rcv_skb+0x158/0x420\n xfrm_netlink_rcv+0x71/0x90\n netlink_unicast+0x584/0x850\n netlink_sendmsg+0x8b0/0xdc0\n ____sys_sendmsg+0x9f7/0xb90\n ___sys_sendmsg+0x134/0x1d0\n __sys_sendmsg+0x16d/0x220\n do_syscall_64+0x116/0x7d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n </TASK>\n\n Allocated by task 9287:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n pfkey_add+0x2652/0x2ea0\n pfkey_process+0x6d0/0x830\n pfkey_sendmsg+0x42c/0x850\n __sys_sendto+0x461/0x4b0\n __x64_sys_sendto+0xe0/0x1c0\n do_syscall_64+0x116/0x7d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n The buggy address belongs to the object at ff11000025a74980\n which belongs to the cache kmalloc-96 of size 96\n The buggy address is located 0 bytes inside of\n allocated 68-byte region [ff11000025a74980, ff11000025a749c4)\n\nDepending on the uninitialized value the same field can instead request\nan oversized kmemdup() allocation and make the migration clone fail.\n\nThe XFRM netlink path is not affected: verify_one_alg() rejects an\nXFRMA_ALG_COMP attribute shorter than xfrm_alg_len(), so a calg added via\nXFRM_MSG_NEWSA is always self-consistent.\n\nInitialize calg->alg_key_len to 0, matching the aalg/ealg branches."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "2.6.21"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "2.6.21"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "2.6.21"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "2.6.21"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.96", "versionStartIncluding": "2.6.21"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.39", "versionStartIncluding": "2.6.21"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.4", "versionStartIncluding": "2.6.21"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "2.6.21"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:55:37.549Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64436", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:38:28.893Z", "dateReserved": "2026-07-19T15:36:31.787Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-25T08:51:10.370Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/key/af_key.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "58e82fc3dedb57b1432292504415b224fd2d6acb", "status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "versionType": "git"}, {"lessThan": "01b9115b55018123ef2449ac4951f89147a8428e", "status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "versionType": "git"}, {"lessThan": "3f63d1752d90c0e28be931a48ab5d89bc97d637d", "status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "versionType": "git"}, {"lessThan": "273c06b81d2e902b21acc801ae18c8276c8a9b69", "status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "versionType": "git"}, {"lessThan": "6de2a650917bedaaefd65b17cede83c5e2c1dedd", "status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "versionType": "git"}, {"lessThan": "e8417353cbd078d10531ba3928e609c84ab09e6b", "status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "versionType": "git"}, {"lessThan": "cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e", "status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "versionType": "git"}, {"lessThan": "d129c3177d7b1138fd5066fcc63a698b3ba415b0", "status": "affected", "version": "80c9abaabf4283f7cf4a0b3597cd302506635b7f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/key/af_key.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.21"}, {"lessThan": "2.6.21", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.96", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.39", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B206899A-54DE-4797-A993-B62C1B128204", "versionEndExcluding": "5.10.261", "versionStartIncluding": "2.6.21", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8E99FB01-CD93-41AF-A653-3F450652B9A6", "versionEndExcluding": "5.15.212", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "092233C7-F4E0-40C8-BD4D-A28FE50DFE20", "versionEndExcluding": "6.1.178", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7046B092-F810-4440-ACE6-60218518EECE", "versionEndExcluding": "6.6.145", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "38A8100E-2B1A-462F-AEE9-8901B870FEF2", "versionEndExcluding": "6.12.96", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "914AE4BC-3D59-4C5A-9DB5-9CE327B429F7", "versionEndExcluding": "6.18.39", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42", "versionEndExcluding": "7.1.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: af_key: initialize alg_key_len for IPComp states\n\npfkey_msg2xfrm_state() handles the IPComp (SADB_X_SATYPE_IPCOMP) case by\nallocating x->calg and copying only the algorithm name:\n\n\tx->calg = kmalloc_obj(*x->calg);\n\tif (!x->calg) {\n\t\terr = -ENOMEM;\n\t\tgoto out;\n\t}\n\tstrcpy(x->calg->alg_name, a->name);\n\tx->props.calgo = sa->sadb_sa_encrypt;\n\nUnlike the authentication (x->aalg) and encryption (x->ealg) branches of\nthe same function, the compression branch never initializes\ncalg->alg_key_len. IPComp carries no key and the allocation only\nreserves sizeof(struct xfrm_algo) (i.e. no room for a key), so the field\nis left containing uninitialized slab data.\n\ncalg->alg_key_len is later used as a length by xfrm_algo_clone() when an\nIPComp state is cloned during XFRM_MSG_MIGRATE:\n\n\txfrm_state_migrate()\n\t xfrm_state_clone_and_setup()\n\t x->calg = xfrm_algo_clone(orig->calg);\n\t kmemdup(orig, xfrm_alg_len(orig));\n\nwhere xfrm_alg_len() returns sizeof(*alg) + (alg_key_len + 7) / 8. With\na non-zero garbage alg_key_len, kmemdup() reads past the end of the\n68-byte calg object. Adding an IPComp SA via PF_KEY and then migrating\nit triggers (net-next, KASAN, init_on_alloc=0):\n\n BUG: KASAN: slab-out-of-bounds in kmemdup_noprof+0x44/0x60\n Read of size 4164 at addr ff11000025a74980 by task diag2/9287\n CPU: 3 UID: 0 PID: 9287 Comm: diag2 7.1.0-rc6-g903db046d557 #1\n Call Trace:\n <TASK>\n dump_stack_lvl+0x10e/0x1f0\n print_report+0xf7/0x600\n kasan_report+0xe4/0x120\n kasan_check_range+0x105/0x1b0\n __asan_memcpy+0x23/0x60\n kmemdup_noprof+0x44/0x60\n xfrm_state_migrate+0x70a/0x1da0\n xfrm_migrate+0x753/0x18a0\n xfrm_do_migrate+0xb47/0xf10\n xfrm_user_rcv_msg+0x411/0xb50\n netlink_rcv_skb+0x158/0x420\n xfrm_netlink_rcv+0x71/0x90\n netlink_unicast+0x584/0x850\n netlink_sendmsg+0x8b0/0xdc0\n ____sys_sendmsg+0x9f7/0xb90\n ___sys_sendmsg+0x134/0x1d0\n __sys_sendmsg+0x16d/0x220\n do_syscall_64+0x116/0x7d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n </TASK>\n\n Allocated by task 9287:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n pfkey_add+0x2652/0x2ea0\n pfkey_process+0x6d0/0x830\n pfkey_sendmsg+0x42c/0x850\n __sys_sendto+0x461/0x4b0\n __x64_sys_sendto+0xe0/0x1c0\n do_syscall_64+0x116/0x7d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n The buggy address belongs to the object at ff11000025a74980\n which belongs to the cache kmalloc-96 of size 96\n The buggy address is located 0 bytes inside of\n allocated 68-byte region [ff11000025a74980, ff11000025a749c4)\n\nDepending on the uninitialized value the same field can instead request\nan oversized kmemdup() allocation and make the migration clone fail.\n\nThe XFRM netlink path is not affected: verify_one_alg() rejects an\nXFRMA_ALG_COMP attribute shorter than xfrm_alg_len(), so a calg added via\nXFRM_MSG_NEWSA is always self-consistent.\n\nInitialize calg->alg_key_len to 0, matching the aalg/ealg branches."}], "id": "CVE-2026-64436", "lastModified": "2026-10-19T21:17:38.040", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64436", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:40:40.992032Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:28.010", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01b9115b55018123ef2449ac4951f89147a8428e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/273c06b81d2e902b21acc801ae18c8276c8a9b69"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3f63d1752d90c0e28be931a48ab5d89bc97d637d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/58e82fc3dedb57b1432292504415b224fd2d6acb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6de2a650917bedaaefd65b17cede83c5e2c1dedd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d129c3177d7b1138fd5066fcc63a698b3ba415b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8417353cbd078d10531ba3928e609c84ab09e6b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-119"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net: af_key: initialize alg_key_len for IPComp states", "id": "2507181", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507181"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel. An uninitialized variable in the IPComp (IP Compression) state handling could allow a local attacker to trigger an out-of-bounds read during state migration. This vulnerability could lead to the disclosure of sensitive kernel memory or cause a denial of service by making the migration clone fail."], "name": "CVE-2026-64436", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64436\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64436\nhttps://lore.kernel.org/linux-cve-announce/2026072538-CVE-2026-64436-7414@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80c9abaabf4283f7cf4a0b3597cd302506635b7f,58e82fc3dedb57b1432292504415b224fd2d6acb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80c9abaabf4283f7cf4a0b3597cd302506635b7f,01b9115b55018123ef2449ac4951f89147a8428e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80c9abaabf4283f7cf4a0b3597cd302506635b7f,3f63d1752d90c0e28be931a48ab5d89bc97d637d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80c9abaabf4283f7cf4a0b3597cd302506635b7f,273c06b81d2e902b21acc801ae18c8276c8a9b69)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80c9abaabf4283f7cf4a0b3597cd302506635b7f,6de2a650917bedaaefd65b17cede83c5e2c1dedd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80c9abaabf4283f7cf4a0b3597cd302506635b7f,e8417353cbd078d10531ba3928e609c84ab09e6b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80c9abaabf4283f7cf4a0b3597cd302506635b7f,cea34abc94b0a81e3a8b5cfb41cf45af37c2c67e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80c9abaabf4283f7cf4a0b3597cd302506635b7f,d129c3177d7b1138fd5066fcc63a698b3ba415b0)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.21"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.21)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-25T18:15:03.375995+00:00", "updated": "2026-10-20T10:15:13.287490+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}