CVE-2026-64575

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64575", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.797Z", "datePublished": "2026-08-05T08:09:31.923Z", "dateUpdated": "2026-10-19T20:48:42.635Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:54.764Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: tcp: fix double sock release on batch realloc\n\nbpf_iter_tcp_batch() releases the current batch via\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\nreturns ERR_PTR() before resume runs, leaving cur_sk < end_sk over\nslots that now hold cookies rather than sock pointers.\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\ndereferences a cookie as a struct sock.\n\nEmpty the batch on the failure path so stop() does not release it\nagain. The sockets were already freed by the first\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\nthe bucket from the start instead of skipping it. The sibling\nGFP_NOWAIT failure path still holds real socket references and is left\nfor stop() to release.\n\n BUG: KASAN: null-ptr-deref in __sock_gen_cookie\n Read of size 8 at addr 0000000000000059 by task exploit\n ...\n __sock_gen_cookie (net/core/sock_diag.c:28)\n bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\n bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\n bpf_seq_read (kernel/bpf/bpf_iter.c:205)\n vfs_read (fs/read_write.c:572)\n ksys_read (fs/read_write.c:716)\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n Kernel panic - not syncing: Fatal exception"}], "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 - Reached only through local bpf() syscalls that load a BPF_TRACE_ITER TCP program, create an iterator fd, and read it; bpf_seq_read drives bpf_iter_tcp_batch/stop. Per guidance BPF subsystem bugs are Local, not network-reachable.\nAC:L - The attacker controls both prerequisites: creating more than INIT_BATCH_SZ TCP sockets in one hash bucket to force bpf_iter_tcp_put_batch-then-realloc, and inducing GFP_USER -ENOMEM (memory pressure/cgroup limits) so the failure path runs without races outside their control.\nPR:L - Loading BPF_PROG_TYPE_TRACING/BPF_TRACE_ITER requires CAP_BPF and CAP_PERFMON, which BPF tokens can delegate into a non-init user namespace; consistent with other BPF iterator CVEs this is Low rather than full init-namespace root.\nUI:N - The attacker loads their own TCP iterator program and triggers the bug by reading their iterator fd; no victim action such as mounting, opening a file, or interacting with the attacker is required.\nS:U - Impact is kernel memory corruption and panic within the same host kernel security authority; this is a standard local kernel bug, not a VM/hypervisor escape or IOMMU boundary bypass.\nC:H - stop() re-enters bpf_iter_tcp_put_batch and treats stored socket cookies as struct sock pointers, so sock_gen_cookie performs an out-of-bounds/wild kernel read; type-confused pointer dereference supports high confidentiality impact under the higher-severity rule.\nI:H - The same type confusion reaches sock_gen_put, which decrements sk_refcnt and may free through the forged pointer, yielding kernel memory corruption and a plausible control-flow/integrity primitive beyond a clean crash.\nA:H - The reported path is a KASAN null-ptr-deref in __sock_gen_cookie during bpf_iter_tcp_seq_stop that ends in kernel panic; the attacker can repeat the iterator read to deny host availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_ipv4.c"], "versions": [{"version": "9794ac757a650dd594391192183c9caf939f8223", "lessThan": "c842882e4c5d2818b858d6baf3fd10958c93f729", "status": "affected", "versionType": "git"}, {"version": "1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4", "lessThan": "7a6a6d2a127866935f87b55b557bc89693065462", "status": "affected", "versionType": "git"}, {"version": "36f955807ee4ede07e9410772f792e4cb4ec807b", "lessThan": "f0c1810320b0dac228103fad7311e89532134d83", "status": "affected", "versionType": "git"}, {"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "lessThan": "9f27c4f0ae35b5390ce4f7a54d3501144e41a54d", "status": "affected", "versionType": "git"}, {"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "lessThan": "8a726e9585ffe7bfbfad2b5279277a00973970f3", "status": "affected", "versionType": "git"}, {"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "lessThan": "980a813452754f8001704744e92f7aa697c53dd3", "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/ipv4/tcp_ipv4.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "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": "6.17", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c842882e4c5d2818b858d6baf3fd10958c93f729"}, {"url": "https://git.kernel.org/stable/c/7a6a6d2a127866935f87b55b557bc89693065462"}, {"url": "https://git.kernel.org/stable/c/f0c1810320b0dac228103fad7311e89532134d83"}, {"url": "https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d"}, {"url": "https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3"}, {"url": "https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3"}], "title": "bpf: tcp: fix double sock release on batch realloc", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64575", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:43:09.032103Z"}}}], "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": "2026-10-19T20:48:42.635Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64575", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.797Z", "datePublished": "2026-08-05T08:09:31.923Z", "dateUpdated": "2026-10-19T20:48:42.635Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:54.764Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: tcp: fix double sock release on batch realloc\n\nbpf_iter_tcp_batch() releases the current batch via\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\nreturns ERR_PTR() before resume runs, leaving cur_sk < end_sk over\nslots that now hold cookies rather than sock pointers.\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\ndereferences a cookie as a struct sock.\n\nEmpty the batch on the failure path so stop() does not release it\nagain. The sockets were already freed by the first\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\nthe bucket from the start instead of skipping it. The sibling\nGFP_NOWAIT failure path still holds real socket references and is left\nfor stop() to release.\n\n BUG: KASAN: null-ptr-deref in __sock_gen_cookie\n Read of size 8 at addr 0000000000000059 by task exploit\n ...\n __sock_gen_cookie (net/core/sock_diag.c:28)\n bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\n bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\n bpf_seq_read (kernel/bpf/bpf_iter.c:205)\n vfs_read (fs/read_write.c:572)\n ksys_read (fs/read_write.c:716)\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n Kernel panic - not syncing: Fatal exception"}], "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 - Reached only through local bpf() syscalls that load a BPF_TRACE_ITER TCP program, create an iterator fd, and read it; bpf_seq_read drives bpf_iter_tcp_batch/stop. Per guidance BPF subsystem bugs are Local, not network-reachable.\nAC:L - The attacker controls both prerequisites: creating more than INIT_BATCH_SZ TCP sockets in one hash bucket to force bpf_iter_tcp_put_batch-then-realloc, and inducing GFP_USER -ENOMEM (memory pressure/cgroup limits) so the failure path runs without races outside their control.\nPR:L - Loading BPF_PROG_TYPE_TRACING/BPF_TRACE_ITER requires CAP_BPF and CAP_PERFMON, which BPF tokens can delegate into a non-init user namespace; consistent with other BPF iterator CVEs this is Low rather than full init-namespace root.\nUI:N - The attacker loads their own TCP iterator program and triggers the bug by reading their iterator fd; no victim action such as mounting, opening a file, or interacting with the attacker is required.\nS:U - Impact is kernel memory corruption and panic within the same host kernel security authority; this is a standard local kernel bug, not a VM/hypervisor escape or IOMMU boundary bypass.\nC:H - stop() re-enters bpf_iter_tcp_put_batch and treats stored socket cookies as struct sock pointers, so sock_gen_cookie performs an out-of-bounds/wild kernel read; type-confused pointer dereference supports high confidentiality impact under the higher-severity rule.\nI:H - The same type confusion reaches sock_gen_put, which decrements sk_refcnt and may free through the forged pointer, yielding kernel memory corruption and a plausible control-flow/integrity primitive beyond a clean crash.\nA:H - The reported path is a KASAN null-ptr-deref in __sock_gen_cookie during bpf_iter_tcp_seq_stop that ends in kernel panic; the attacker can repeat the iterator read to deny host availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_ipv4.c"], "versions": [{"version": "9794ac757a650dd594391192183c9caf939f8223", "lessThan": "c842882e4c5d2818b858d6baf3fd10958c93f729", "status": "affected", "versionType": "git"}, {"version": "1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4", "lessThan": "7a6a6d2a127866935f87b55b557bc89693065462", "status": "affected", "versionType": "git"}, {"version": "36f955807ee4ede07e9410772f792e4cb4ec807b", "lessThan": "f0c1810320b0dac228103fad7311e89532134d83", "status": "affected", "versionType": "git"}, {"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "lessThan": "9f27c4f0ae35b5390ce4f7a54d3501144e41a54d", "status": "affected", "versionType": "git"}, {"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "lessThan": "8a726e9585ffe7bfbfad2b5279277a00973970f3", "status": "affected", "versionType": "git"}, {"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "lessThan": "980a813452754f8001704744e92f7aa697c53dd3", "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/ipv4/tcp_ipv4.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "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": "6.17", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c842882e4c5d2818b858d6baf3fd10958c93f729"}, {"url": "https://git.kernel.org/stable/c/7a6a6d2a127866935f87b55b557bc89693065462"}, {"url": "https://git.kernel.org/stable/c/f0c1810320b0dac228103fad7311e89532134d83"}, {"url": "https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d"}, {"url": "https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3"}, {"url": "https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3"}], "title": "bpf: tcp: fix double sock release on batch realloc", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64575", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:43:09.032103Z"}}}], "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": "2026-10-16T15:43:09.675Z"}}]}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/tcp_ipv4.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c842882e4c5d2818b858d6baf3fd10958c93f729", "status": "affected", "version": "9794ac757a650dd594391192183c9caf939f8223", "versionType": "git"}, {"lessThan": "7a6a6d2a127866935f87b55b557bc89693065462", "status": "affected", "version": "1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4", "versionType": "git"}, {"lessThan": "f0c1810320b0dac228103fad7311e89532134d83", "status": "affected", "version": "36f955807ee4ede07e9410772f792e4cb4ec807b", "versionType": "git"}, {"lessThan": "9f27c4f0ae35b5390ce4f7a54d3501144e41a54d", "status": "affected", "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "versionType": "git"}, {"lessThan": "8a726e9585ffe7bfbfad2b5279277a00973970f3", "status": "affected", "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "versionType": "git"}, {"lessThan": "980a813452754f8001704744e92f7aa697c53dd3", "status": "affected", "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/tcp_ipv4.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"lessThan": "6.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: tcp: fix double sock release on batch realloc\n\nbpf_iter_tcp_batch() releases the current batch via\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\nreturns ERR_PTR() before resume runs, leaving cur_sk < end_sk over\nslots that now hold cookies rather than sock pointers.\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\ndereferences a cookie as a struct sock.\n\nEmpty the batch on the failure path so stop() does not release it\nagain. The sockets were already freed by the first\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\nthe bucket from the start instead of skipping it. The sibling\nGFP_NOWAIT failure path still holds real socket references and is left\nfor stop() to release.\n\n BUG: KASAN: null-ptr-deref in __sock_gen_cookie\n Read of size 8 at addr 0000000000000059 by task exploit\n ...\n __sock_gen_cookie (net/core/sock_diag.c:28)\n bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\n bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\n bpf_seq_read (kernel/bpf/bpf_iter.c:205)\n vfs_read (fs/read_write.c:572)\n ksys_read (fs/read_write.c:716)\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n Kernel panic - not syncing: Fatal exception"}], "id": "CVE-2026-64575", "lastModified": "2026-10-19T21:17:47.840", "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-2026-64575", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:43:09.032103Z", "version": "2.0.3"}}]}, "published": "2026-08-05T08:16:37.363", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a6a6d2a127866935f87b55b557bc89693065462"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c842882e4c5d2818b858d6baf3fd10958c93f729"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f0c1810320b0dac228103fad7311e89532134d83"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: bpf: tcp: fix double sock release on batch realloc", "id": "2511414", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511414"}, "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-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: tcp: fix double sock release on batch realloc\nbpf_iter_tcp_batch() releases the current batch via\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\nreturns ERR_PTR() before resume runs, leaving cur_sk < end_sk over\nslots that now hold cookies rather than sock pointers.\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\ndereferences a cookie as a struct sock.\nEmpty the batch on the failure path so stop() does not release it\nagain. The sockets were already freed by the first\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\nthe bucket from the start instead of skipping it. The sibling\nGFP_NOWAIT failure path still holds real socket references and is left\nfor stop() to release.\nBUG: KASAN: null-ptr-deref in __sock_gen_cookie\nRead of size 8 at addr 0000000000000059 by task exploit\n...\n__sock_gen_cookie (net/core/sock_diag.c:28)\nbpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\nbpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\nbpf_seq_read (kernel/bpf/bpf_iter.c:205)\nvfs_read (fs/read_write.c:572)\nksys_read (fs/read_write.c:716)\ndo_syscall_64\nentry_SYSCALL_64_after_hwframe\nKernel panic - not syncing: Fatal exception", "A flaw was found in the Linux kernel. A double release of socket resources can occur during batch reallocation in the BPF (Berkeley Packet Filter) TCP iterator. A local attacker could exploit this vulnerability to trigger a kernel panic. This leads to a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-64575", "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": "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64575\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64575\nhttps://lore.kernel.org/linux-cve-announce/2026080523-CVE-2026-64575-f476@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cdec67a489d4fdae3e83e04fca0419136a83c4c2,9f27c4f0ae35b5390ce4f7a54d3501144e41a54d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cdec67a489d4fdae3e83e04fca0419136a83c4c2,8a726e9585ffe7bfbfad2b5279277a00973970f3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cdec67a489d4fdae3e83e04fca0419136a83c4c2,980a813452754f8001704744e92f7aa697c53dd3)"}}], "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": "6.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc5,*]"}}], "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": "2026-08-05T09:30:11.603803+00:00", "updated": "2026-10-20T13:45:13.295293+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}