CVE-2026-64579 (GCVE-0-2026-64579)

Vulnerability from cvelistv5 – Published: 2026-08-05 08:09 – Updated: 2026-08-05 08:09
VLAI
Title
xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert xfrm_hash_rebuild()'s first loop preallocates the bins/chains the reinsert loop needs, so the reinsert (after hlist_del_rcu()) cannot allocate or fail. But its guard is inverted: it skips policies with prefixlen < threshold and preallocates for the rest. prefixlen < threshold is exactly when policy_hash_bysel() returns NULL and the reinsert takes the allocating xfrm_policy_inexact_insert() path. So the loop preallocates for the exact policies (which never allocate) and skips the inexact ones, whose bin/node is then allocated GFP_ATOMIC during reinsert. On failure the error path only WARN_ONCE()s and continues, leaving a poisoned bydst node; the next rebuild's hlist_del_rcu() dereferences LIST_POISON2 and takes a GPF. Reachable under memory pressure, deterministic via failslab. Invert the guard so preallocation covers exactly the reinserted policies; the reinsert then allocates nothing and cannot fail. Crash: Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000024: 0000 [#1] SMP KASAN NOPTI KASAN: maybe wild-memory-access in range [0xdead...] ... Workqueue: events xfrm_hash_rebuild RIP: 0010:xfrm_hash_rebuild+0x5b3/0x1190 RAX: dead000000000122 (LIST_POISON2 + offset) ... Call Trace: hlist_del_rcu (include/linux/rculist.h:599) xfrm_hash_rebuild (net/xfrm/xfrm_policy.c:1365) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) ... Kernel panic - not syncing: Fatal exception in interrupt
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 24969facd704a5f0dd8e08da86bf32a9ce972bee , < d9d9cc21cc90014724a14c447e3d587be9447107 (git)
Affected: 24969facd704a5f0dd8e08da86bf32a9ce972bee , < 94c00391a5117530188334f740ce26d3f1256190 (git)
Affected: 24969facd704a5f0dd8e08da86bf32a9ce972bee , < 7acc5ed2f33608a3d83b64f50a5766843b6e2485 (git)
Affected: 24969facd704a5f0dd8e08da86bf32a9ce972bee , < 6aa3796d18a9fda953ad76a62b57bf6c145cb9ef (git)
Affected: 24969facd704a5f0dd8e08da86bf32a9ce972bee , < f38f8cce2f7e79775b3db7e8a5eacda04ac908e4 (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc4 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_policy.c"
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
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              "version": "7.1.6",
              "versionType": "semver"
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              "version": "7.2-rc4",
              "versionType": "original_commit_for_fix"
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          "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()\u0027s 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 \u003c\nthreshold and preallocates for the rest.\n\nprefixlen \u003c 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\u0027s 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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:09:34.346Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d9d9cc21cc90014724a14c447e3d587be9447107"
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          "url": "https://git.kernel.org/stable/c/94c00391a5117530188334f740ce26d3f1256190"
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          "url": "https://git.kernel.org/stable/c/7acc5ed2f33608a3d83b64f50a5766843b6e2485"
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          "url": "https://git.kernel.org/stable/c/f38f8cce2f7e79775b3db7e8a5eacda04ac908e4"
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      ],
      "title": "xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64579",
    "datePublished": "2026-08-05T08:09:34.346Z",
    "dateReserved": "2026-07-19T15:36:31.798Z",
    "dateUpdated": "2026-08-05T08:09:34.346Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-08-06",
      "epss": "0.00156",
      "percentile": "0.05259"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64579\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-05T08:16:37.893\",\"lastModified\":\"2026-08-05T08:16:37.893\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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()\u0027s 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 \u003c\\nthreshold and preallocates for the rest.\\n\\nprefixlen \u003c 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\u0027s 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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xfrm/xfrm_policy.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"24969facd704a5f0dd8e08da86bf32a9ce972bee\",\"lessThan\":\"d9d9cc21cc90014724a14c447e3d587be9447107\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24969facd704a5f0dd8e08da86bf32a9ce972bee\",\"lessThan\":\"94c00391a5117530188334f740ce26d3f1256190\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24969facd704a5f0dd8e08da86bf32a9ce972bee\",\"lessThan\":\"7acc5ed2f33608a3d83b64f50a5766843b6e2485\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24969facd704a5f0dd8e08da86bf32a9ce972bee\",\"lessThan\":\"6aa3796d18a9fda953ad76a62b57bf6c145cb9ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24969facd704a5f0dd8e08da86bf32a9ce972bee\",\"lessThan\":\"f38f8cce2f7e79775b3db7e8a5eacda04ac908e4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xfrm/xfrm_policy.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc4\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6aa3796d18a9fda953ad76a62b57bf6c145cb9ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7acc5ed2f33608a3d83b64f50a5766843b6e2485\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/94c00391a5117530188334f740ce26d3f1256190\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d9d9cc21cc90014724a14c447e3d587be9447107\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f38f8cce2f7e79775b3db7e8a5eacda04ac908e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-06T10:06:22+00:00",
      "cve": "CVE-2026-64579",
      "id": "CVE-2026-64579",
      "initial_release_date": "2026-08-05T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64579.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:06:16Z",
      "cve": "CVE-2026-64579",
      "id": "CVE-2026-64579",
      "initial_release_date": "2026-08-06T01:06:16Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64579",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64579.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.