{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64579", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.798Z", "datePublished": "2026-08-05T08:09:34.346Z", "dateUpdated": "2026-08-05T08:09:34.346Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:09:34.346Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert\n\nxfrm_hash_rebuild()'s first loop preallocates the bins/chains the reinsert\nloop needs, so the reinsert (after hlist_del_rcu()) cannot allocate or\nfail. But its guard is inverted: it skips policies with prefixlen <\nthreshold and preallocates for the rest.\n\nprefixlen < threshold is exactly when policy_hash_bysel() returns NULL and\nthe reinsert takes the allocating xfrm_policy_inexact_insert() path. So the\nloop preallocates for the exact policies (which never allocate) and skips\nthe inexact ones, whose bin/node is then allocated GFP_ATOMIC during\nreinsert. On failure the error path only WARN_ONCE()s and continues,\nleaving a poisoned bydst node; the next rebuild's hlist_del_rcu()\ndereferences LIST_POISON2 and takes a GPF. Reachable under memory pressure,\ndeterministic via failslab.\n\nInvert the guard so preallocation covers exactly the reinserted policies;\nthe reinsert then allocates nothing and cannot fail.\n\nCrash:\n Oops: general protection fault, probably for non-canonical address\n 0xfbd59c0000000024: 0000 [#1] SMP KASAN NOPTI\n KASAN: maybe wild-memory-access in range [0xdead...]\n ...\n Workqueue: events xfrm_hash_rebuild\n RIP: 0010:xfrm_hash_rebuild+0x5b3/0x1190\n RAX: dead000000000122 (LIST_POISON2 + offset)\n ...\n Call Trace:\n hlist_del_rcu (include/linux/rculist.h:599)\n xfrm_hash_rebuild (net/xfrm/xfrm_policy.c:1365)\n process_one_work (kernel/workqueue.c:3322)\n worker_thread (kernel/workqueue.c:3486)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:158)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n ...\n Kernel panic - not syncing: Fatal exception in interrupt"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_policy.c"], "versions": [{"version": "24969facd704a5f0dd8e08da86bf32a9ce972bee", "lessThan": "d9d9cc21cc90014724a14c447e3d587be9447107", "status": "affected", "versionType": "git"}, {"version": "24969facd704a5f0dd8e08da86bf32a9ce972bee", "lessThan": "94c00391a5117530188334f740ce26d3f1256190", "status": "affected", "versionType": "git"}, {"version": "24969facd704a5f0dd8e08da86bf32a9ce972bee", "lessThan": "7acc5ed2f33608a3d83b64f50a5766843b6e2485", "status": "affected", "versionType": "git"}, {"version": "24969facd704a5f0dd8e08da86bf32a9ce972bee", "lessThan": "6aa3796d18a9fda953ad76a62b57bf6c145cb9ef", "status": "affected", "versionType": "git"}, {"version": "24969facd704a5f0dd8e08da86bf32a9ce972bee", "lessThan": "f38f8cce2f7e79775b3db7e8a5eacda04ac908e4", "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/xfrm/xfrm_policy.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "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-rc4", "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": "5.0", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2-rc4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d9d9cc21cc90014724a14c447e3d587be9447107"}, {"url": "https://git.kernel.org/stable/c/94c00391a5117530188334f740ce26d3f1256190"}, {"url": "https://git.kernel.org/stable/c/7acc5ed2f33608a3d83b64f50a5766843b6e2485"}, {"url": "https://git.kernel.org/stable/c/6aa3796d18a9fda953ad76a62b57bf6c145cb9ef"}, {"url": "https://git.kernel.org/stable/c/f38f8cce2f7e79775b3db7e8a5eacda04ac908e4"}], "title": "xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[24969facd704a5f0dd8e08da86bf32a9ce972bee,d9d9cc21cc90014724a14c447e3d587be9447107)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[24969facd704a5f0dd8e08da86bf32a9ce972bee,94c00391a5117530188334f740ce26d3f1256190)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[24969facd704a5f0dd8e08da86bf32a9ce972bee,7acc5ed2f33608a3d83b64f50a5766843b6e2485)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[24969facd704a5f0dd8e08da86bf32a9ce972bee,6aa3796d18a9fda953ad76a62b57bf6c145cb9ef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[24969facd704a5f0dd8e08da86bf32a9ce972bee,f38f8cce2f7e79775b3db7e8a5eacda04ac908e4)"}}], "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": "generic", "value": "5.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"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": "generic", "value": "[7.2-rc4,*]"}}], "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": "2026-08-05T09:30:11.603536+00:00", "updated": "2026-08-05T10:00:03.407496+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476", "CWE-125"]}