CVE-2026-64543

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64543", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.795Z", "datePublished": "2026-07-27T20:10:35.565Z", "dateUpdated": "2026-10-19T20:48:39.735Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:28.342Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix use-after-free of the discoverer in tipc_disc_rcv()\n\nbearer_disable() frees b->disc with tipc_disc_delete()'s plain kfree(),\nbut tipc_disc_rcv() still dereferences b->disc in RX softirq under\nrcu_read_lock() (tipc_udp_recv -> tipc_rcv -> tipc_disc_rcv).\n\nL2 bearers are safe thanks to the synchronize_net() in\ntipc_disable_l2_media(), but the UDP bearer defers that call to the\ncleanup_bearer() workqueue, so the discoverer is freed with no grace\nperiod:\n\n BUG: KASAN: slab-use-after-free in tipc_disc_rcv (net/tipc/discover.c:149)\n Read of size 8 at addr ffff88802348b728 by task poc_tipc/184\n <IRQ>\n tipc_disc_rcv (net/tipc/discover.c:149)\n tipc_rcv (net/tipc/node.c:2126)\n tipc_udp_recv (net/tipc/udp_media.c:391)\n udp_rcv (net/ipv4/udp.c:2643)\n ip_local_deliver_finish (net/ipv4/ip_input.c:241)\n </IRQ>\n Freed by task 181:\n kfree (mm/slub.c:6565)\n bearer_disable (net/tipc/bearer.c:418)\n tipc_nl_bearer_disable (net/tipc/bearer.c:1001)\n\nThe bearer is freed with kfree_rcu(); free the discoverer the same way.\nAdd an rcu_head to struct tipc_discoverer and free it and its skb from an\nRCU callback.\n\nBecause the RCU callback (tipc_disc_free_rcu) lives in module text, a\ncall_rcu() that is still pending when the tipc module is unloaded would\ninvoke a freed function. Add an rcu_barrier() to tipc_exit() after the\nbearer subsystem has been torn down, so all pending discoverer callbacks\nhave run before the module text goes away.\n\nReachable from an unprivileged user namespace: the TIPCv2 genl family is\nnetnsok and its bearer commands have no GENL_ADMIN_PERM. Needs CONFIG_TIPC\nand CONFIG_TIPC_MEDIA_UDP."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The free side is only reachable through the local TIPCv2 generic-netlink `BEARER_DISABLE` command (or netns teardown); a remote peer can supply the discovery packet that performs the use-after-free access but cannot itself cause `bearer_disable()` to run, so the complete attack requires local access.\nAC:L - The attacker controls both sides of the race \u2014 one thread floods TIPC discovery packets at the bearer's UDP port while another disables the bearer \u2014 and `bearer_disable()` clears `b->up` and then `kfree()`s the discoverer with no synchronization whatsoever, leaving a wide window that a multi-CPU packet flood hits reliably (a working PoC exists).\nPR:L - `tipc_genl_family` is `.netnsok = true` and the bearer enable/disable ops carry no `GENL_ADMIN_PERM` or other capability check, so an unprivileged user can do everything inside `unshare -Urn` after autoloading tipc via `socket(AF_TIPC, ...)`.\nUI:N - The attacking process performs both the bearer disable and the packet injection itself; no victim action or cooperating user is involved.\nS:U - The corruption stays within the kernel's own security authority \u2014 no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `d->net` is read from the freed slab object and dereferenced as a `struct net *`; after reclaiming the kmalloc-192 allocation with sprayed data the attacker gains a controlled-pointer dereference chain usable for arbitrary kernel memory disclosure.\nI:H - `msg_set_prevnode(buf_msg(d->skb), sugg_addr)` writes a wire-controlled 32-bit value through the dangling `d->skb` pointer, and `tipc_disc_add_dest()` takes a spinlock and increments a counter in freed memory \u2014 together a controlled-address/controlled-value write suitable for control-flow hijacking.\nA:H - The use-after-free reliably produces a KASAN slab-use-after-free in softirq context and, on production kernels, a corrupted-pointer dereference or spinlock manipulation on reclaimed memory leading to kernel panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tipc/core.c", "net/tipc/discover.c"], "versions": [{"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "380413cdfd29fb9fa486c82889132b680c4983c5", "status": "affected", "versionType": "git"}, {"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "f05b3f4c78370469286879c765f5a1dd39dbcd32", "status": "affected", "versionType": "git"}, {"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "4da2ac7749411971e1b222b992da5a172ce45f98", "status": "affected", "versionType": "git"}, {"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "5e215bf1c47fdddf8203a0fe80a0ed594065f101", "status": "affected", "versionType": "git"}, {"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "ec7d54d8cc1723921d671e3272b427c96366506f", "status": "affected", "versionType": "git"}, {"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2", "status": "affected", "versionType": "git"}, {"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "b65289e1c3f352a9f92c6e19713ddd647e033253", "status": "affected", "versionType": "git"}, {"version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "1579342d71133da7f00daa02c75cebec7372097b", "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/tipc/core.c", "net/tipc/discover.c"], "versions": [{"version": "4.17", "status": "affected"}, {"version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "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": "4.17", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/380413cdfd29fb9fa486c82889132b680c4983c5"}, {"url": "https://git.kernel.org/stable/c/f05b3f4c78370469286879c765f5a1dd39dbcd32"}, {"url": "https://git.kernel.org/stable/c/4da2ac7749411971e1b222b992da5a172ce45f98"}, {"url": "https://git.kernel.org/stable/c/5e215bf1c47fdddf8203a0fe80a0ed594065f101"}, {"url": "https://git.kernel.org/stable/c/ec7d54d8cc1723921d671e3272b427c96366506f"}, {"url": "https://git.kernel.org/stable/c/a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2"}, {"url": "https://git.kernel.org/stable/c/b65289e1c3f352a9f92c6e19713ddd647e033253"}, {"url": "https://git.kernel.org/stable/c/1579342d71133da7f00daa02c75cebec7372097b"}], "title": "tipc: fix use-after-free of the discoverer in tipc_disc_rcv()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64543", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:42:12.338756Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:48:39.735Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64543", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:42:12.338756Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:42:12.995Z"}}], "cna": {"title": "tipc: fix use-after-free of the discoverer in tipc_disc_rcv()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The free side is only reachable through the local TIPCv2 generic-netlink `BEARER_DISABLE` command (or netns teardown); a remote peer can supply the discovery packet that performs the use-after-free access but cannot itself cause `bearer_disable()` to run, so the complete attack requires local access.\nAC:L - The attacker controls both sides of the race \u2014 one thread floods TIPC discovery packets at the bearer's UDP port while another disables the bearer \u2014 and `bearer_disable()` clears `b->up` and then `kfree()`s the discoverer with no synchronization whatsoever, leaving a wide window that a multi-CPU packet flood hits reliably (a working PoC exists).\nPR:L - `tipc_genl_family` is `.netnsok = true` and the bearer enable/disable ops carry no `GENL_ADMIN_PERM` or other capability check, so an unprivileged user can do everything inside `unshare -Urn` after autoloading tipc via `socket(AF_TIPC, ...)`.\nUI:N - The attacking process performs both the bearer disable and the packet injection itself; no victim action or cooperating user is involved.\nS:U - The corruption stays within the kernel's own security authority \u2014 no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `d->net` is read from the freed slab object and dereferenced as a `struct net *`; after reclaiming the kmalloc-192 allocation with sprayed data the attacker gains a controlled-pointer dereference chain usable for arbitrary kernel memory disclosure.\nI:H - `msg_set_prevnode(buf_msg(d->skb), sugg_addr)` writes a wire-controlled 32-bit value through the dangling `d->skb` pointer, and `tipc_disc_add_dest()` takes a spinlock and increments a counter in freed memory \u2014 together a controlled-address/controlled-value write suitable for control-flow hijacking.\nA:H - The use-after-free reliably produces a KASAN slab-use-after-free in softirq context and, on production kernels, a corrupted-pointer dereference or spinlock manipulation on reclaimed memory leading to kernel panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "380413cdfd29fb9fa486c82889132b680c4983c5", "versionType": "git"}, {"status": "affected", "version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "f05b3f4c78370469286879c765f5a1dd39dbcd32", "versionType": "git"}, {"status": "affected", "version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "4da2ac7749411971e1b222b992da5a172ce45f98", "versionType": "git"}, {"status": "affected", "version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "5e215bf1c47fdddf8203a0fe80a0ed594065f101", "versionType": "git"}, {"status": "affected", "version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "ec7d54d8cc1723921d671e3272b427c96366506f", "versionType": "git"}, {"status": "affected", "version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2", "versionType": "git"}, {"status": "affected", "version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "b65289e1c3f352a9f92c6e19713ddd647e033253", "versionType": "git"}, {"status": "affected", "version": "25b0b9c4e835ffaa65b61c3efe2e28acf84d0259", "lessThan": "1579342d71133da7f00daa02c75cebec7372097b", "versionType": "git"}], "programFiles": ["net/tipc/core.c", "net/tipc/discover.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"status": "unaffected", "version": "0", "lessThan": "4.17", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/tipc/core.c", "net/tipc/discover.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/380413cdfd29fb9fa486c82889132b680c4983c5"}, {"url": "https://git.kernel.org/stable/c/f05b3f4c78370469286879c765f5a1dd39dbcd32"}, {"url": "https://git.kernel.org/stable/c/4da2ac7749411971e1b222b992da5a172ce45f98"}, {"url": "https://git.kernel.org/stable/c/5e215bf1c47fdddf8203a0fe80a0ed594065f101"}, {"url": "https://git.kernel.org/stable/c/ec7d54d8cc1723921d671e3272b427c96366506f"}, {"url": "https://git.kernel.org/stable/c/a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2"}, {"url": "https://git.kernel.org/stable/c/b65289e1c3f352a9f92c6e19713ddd647e033253"}, {"url": "https://git.kernel.org/stable/c/1579342d71133da7f00daa02c75cebec7372097b"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix use-after-free of the discoverer in tipc_disc_rcv()\n\nbearer_disable() frees b->disc with tipc_disc_delete()'s plain kfree(),\nbut tipc_disc_rcv() still dereferences b->disc in RX softirq under\nrcu_read_lock() (tipc_udp_recv -> tipc_rcv -> tipc_disc_rcv).\n\nL2 bearers are safe thanks to the synchronize_net() in\ntipc_disable_l2_media(), but the UDP bearer defers that call to the\ncleanup_bearer() workqueue, so the discoverer is freed with no grace\nperiod:\n\n BUG: KASAN: slab-use-after-free in tipc_disc_rcv (net/tipc/discover.c:149)\n Read of size 8 at addr ffff88802348b728 by task poc_tipc/184\n <IRQ>\n tipc_disc_rcv (net/tipc/discover.c:149)\n tipc_rcv (net/tipc/node.c:2126)\n tipc_udp_recv (net/tipc/udp_media.c:391)\n udp_rcv (net/ipv4/udp.c:2643)\n ip_local_deliver_finish (net/ipv4/ip_input.c:241)\n </IRQ>\n Freed by task 181:\n kfree (mm/slub.c:6565)\n bearer_disable (net/tipc/bearer.c:418)\n tipc_nl_bearer_disable (net/tipc/bearer.c:1001)\n\nThe bearer is freed with kfree_rcu(); free the discoverer the same way.\nAdd an rcu_head to struct tipc_discoverer and free it and its skb from an\nRCU callback.\n\nBecause the RCU callback (tipc_disc_free_rcu) lives in module text, a\ncall_rcu() that is still pending when the tipc module is unloaded would\ninvoke a freed function. Add an rcu_barrier() to tipc_exit() after the\nbearer subsystem has been torn down, so all pending discoverer callbacks\nhave run before the module text goes away.\n\nReachable from an unprivileged user namespace: the TIPCv2 genl family is\nnetnsok and its bearer commands have no GENL_ADMIN_PERM. Needs CONFIG_TIPC\nand CONFIG_TIPC_MEDIA_UDP."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:28.342Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64543", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:48:39.735Z", "dateReserved": "2026-07-19T15:36:31.795Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-27T20:10:35.565Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"versionEndExcluding": "6.18.40", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FE149C35-43CC-473B-86E3-978E6A9CBC55", "versionEndExcluding": "7.1.5", "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\ntipc: fix use-after-free of the discoverer in tipc_disc_rcv()\n\nbearer_disable() frees b->disc with tipc_disc_delete()'s plain kfree(),\nbut tipc_disc_rcv() still dereferences b->disc in RX softirq under\nrcu_read_lock() (tipc_udp_recv -> tipc_rcv -> tipc_disc_rcv).\n\nL2 bearers are safe thanks to the synchronize_net() in\ntipc_disable_l2_media(), but the UDP bearer defers that call to the\ncleanup_bearer() workqueue, so the discoverer is freed with no grace\nperiod:\n\n BUG: KASAN: slab-use-after-free in tipc_disc_rcv (net/tipc/discover.c:149)\n Read of size 8 at addr ffff88802348b728 by task poc_tipc/184\n <IRQ>\n tipc_disc_rcv (net/tipc/discover.c:149)\n tipc_rcv (net/tipc/node.c:2126)\n tipc_udp_recv (net/tipc/udp_media.c:391)\n udp_rcv (net/ipv4/udp.c:2643)\n ip_local_deliver_finish (net/ipv4/ip_input.c:241)\n </IRQ>\n Freed by task 181:\n kfree (mm/slub.c:6565)\n bearer_disable (net/tipc/bearer.c:418)\n tipc_nl_bearer_disable (net/tipc/bearer.c:1001)\n\nThe bearer is freed with kfree_rcu(); free the discoverer the same way.\nAdd an rcu_head to struct tipc_discoverer and free it and its skb from an\nRCU callback.\n\nBecause the RCU callback (tipc_disc_free_rcu) lives in module text, a\ncall_rcu() that is still pending when the tipc module is unloaded would\ninvoke a freed function. Add an rcu_barrier() to tipc_exit() after the\nbearer subsystem has been torn down, so all pending discoverer callbacks\nhave run before the module text goes away.\n\nReachable from an unprivileged user namespace: the TIPCv2 genl family is\nnetnsok and its bearer commands have no GENL_ADMIN_PERM. Needs CONFIG_TIPC\nand CONFIG_TIPC_MEDIA_UDP."}], "id": "CVE-2026-64543", "lastModified": "2026-11-13T18:26:15.660", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64543", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:42:12.338756Z", "version": "2.0.3"}}]}, "published": "2026-07-27T21:17:06.850", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1579342d71133da7f00daa02c75cebec7372097b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/380413cdfd29fb9fa486c82889132b680c4983c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4da2ac7749411971e1b222b992da5a172ce45f98"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e215bf1c47fdddf8203a0fe80a0ed594065f101"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b65289e1c3f352a9f92c6e19713ddd647e033253"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec7d54d8cc1723921d671e3272b427c96366506f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f05b3f4c78370469286879c765f5a1dd39dbcd32"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: tipc: fix use-after-free of the discoverer in tipc_disc_rcv()", "id": "2507768", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507768"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's Transparent Inter-Process Communication (TIPC) module. A use-after-free vulnerability exists in the `tipc_disc_rcv()` function, where the `discoverer` object can be prematurely freed while still being referenced. An unprivileged local user can exploit this flaw by interacting with the TIPCv2 generic netlink family, potentially causing a system crash and leading to a denial of service."], "name": "CVE-2026-64543", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64543\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64543\nhttps://lore.kernel.org/linux-cve-announce/2026072736-CVE-2026-64543-1934@gregkh/T"], "threat_severity": "Moderate"}

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