{ "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": "2026-08-19T16:29:04.594Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:29:04.594Z" }, "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": "e48f4c3e3df35b34be719d72d737bbeaca77cf0c", "status": "affected", "versionType": "git" }, { "version": "24969facd704a5f0dd8e08da86bf32a9ce972bee", "lessThan": "1cdeed9df1306f1a277e715600772640d63defa9", "status": "affected", "versionType": "git" }, { "version": "24969facd704a5f0dd8e08da86bf32a9ce972bee", "lessThan": "43a4d510523779891cf8eca7ffb4a086b0b5d8bf", "status": "affected", "versionType": "git" }, { "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": "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": "6.6.148", "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", "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": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.183" }, { "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" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e48f4c3e3df35b34be719d72d737bbeaca77cf0c" }, { "url": "https://git.kernel.org/stable/c/1cdeed9df1306f1a277e715600772640d63defa9" }, { "url": "https://git.kernel.org/stable/c/43a4d510523779891cf8eca7ffb4a086b0b5d8bf" }, { "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" } } } }