CVE-2026-74662 (GCVE-0-2026-74662)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-27 12:39
VLAI
Title
inet: frags: publish queues before arming timer
Summary
In the Linux kernel, the following vulnerability has been resolved: inet: frags: publish queues before arming timer inet_frag_create() arms the fragment queue timer before inserting the queue into the fqdir rhashtable. If the namespace fragment timeout is zero or negative, the timer can run before the queue is published. The timer callback then marks the queue complete, tries to remove a node that is not in the hash table yet, and drops the anticipated hash reference. Creation can subsequently publish the completed queue without restoring that reference, leaving a stale hash node after the caller drops the remaining reference. Publish the queue first and arm the timer while holding the queue lock. This makes timer expiry wait until the queue is visible in the hash table, so inet_frag_kill() can remove the node and balance the hash reference.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 648700f76b03b7e8149d13cc2bdb3355035258a9 , < f4e4dab62181b7fe7c011bed6fbef9fc3d48c769 (git)
Affected: 648700f76b03b7e8149d13cc2bdb3355035258a9 , < 4ed0681dc2c1e0538b79d2fc56190ffcb369dacd (git)
Affected: 648700f76b03b7e8149d13cc2bdb3355035258a9 , < 08a04d7bfb9c103432561aff8a62b6872e694a6a (git)
Affected: 648700f76b03b7e8149d13cc2bdb3355035258a9 , < d3ffb89b2944672cf7bdd8e9ee577d2043b4a956 (git)
Affected: 648700f76b03b7e8149d13cc2bdb3355035258a9 , < 39c6c4b267b65f00e0b0335a2ae00cbe9e3174f0 (git)
Affected: 648700f76b03b7e8149d13cc2bdb3355035258a9 , < 9f904dd3e455750e5d4ec9b2f134835811b85a2f (git)
Affected: 648700f76b03b7e8149d13cc2bdb3355035258a9 , < 928128865e43b197e30688dc1bc991592c97edcf (git)
Affected: 648700f76b03b7e8149d13cc2bdb3355035258a9 , < 653d7ddf6cba867777a3d14c4f83ace008c5ad13 (git)
Affected: 493107105843f299662b3b664a83804645564f12 (git)
Affected: 4.4.174 , < 4.5 (semver)
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Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ninet: frags: publish queues before arming timer\n\ninet_frag_create() arms the fragment queue timer before inserting the\nqueue into the fqdir rhashtable. If the namespace fragment timeout is\nzero or negative, the timer can run before the queue is published.\n\nThe timer callback then marks the queue complete, tries to remove a node\nthat is not in the hash table yet, and drops the anticipated hash\nreference. Creation can subsequently publish the completed queue without\nrestoring that reference, leaving a stale hash node after the caller drops\nthe remaining reference.\n\nPublish the queue first and arm the timer while holding the queue lock.\nThis makes timer expiry wait until the queue is visible in the hash table,\nso inet_frag_kill() can remove the node and balance the hash reference."
        }
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            "baseSeverity": "CRITICAL",
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            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:N - IPv4/IPv6 fragments reach inet_frag_create() via remote receive paths (ip_defrag, ipv6_frag_rcv, nf_conntrack reassembly) on any Internet-facing host performing normal fragment reassembly before transport delivery.\nAC:L - Requires per-netns fragment timeout \u22640 so the armed timer expires during queue creation; attacker-settable with CAP_NET_ADMIN in user/net namespaces, and the timer/hash race is fully attacker-controlled and repeatable via crafted fragments.\nPR:N - No authentication or capability check gates IPv4/IPv6 fragment receive/reassembly before inet_frag_find(); remote peers can deliver the triggering fragmented traffic pre-authentication to hosts processing fragments.\nUI:N - Exploitation needs only crafted fragmented packet delivery; no victim action such as opening files, clicking links, or mounting filesystems is required.\nS:U - Corruption is confined to the kernel network stack in the same security authority; this is standard kernel memory corruption/privilege escalation, not a VM escape or IOMMU boundary bypass.\nC:H - Incorrect refcounting leaves a stale rhashtable entry pointing at a freed inet_frag_queue; subsequent fragment lookups dereference freed slab memory, enabling kernel information disclosure primitives.\nI:H - Follow-on fragment handling on the stale queue writes through freed inet_frag_queue and skb linkage fields, yielding kernel heap corruption exploitable for arbitrary modification or code execution.\nA:H - Freed-queue dereferences during reassembly can kernel oops or panic; attackers can retrigger the condition repeatedly by sending additional fragmented datagrams matching the same fragment key."
            }
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        "dateUpdated": "2026-08-27T12:39:58.332Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-08-15T05:44:03.924Z",
    "dateUpdated": "2026-08-27T12:39:58.332Z",
    "state": "PUBLISHED"
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      "title": "inet: frags: publish queues before arming timer",
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Creation can subsequently publish the completed queue without\\nrestoring that reference, leaving a stale hash node after the caller drops\\nthe remaining reference.\\n\\nPublish the queue first and arm the timer while holding the queue lock.\\nThis makes timer expiry wait until the queue is visible in the hash table,\\nso inet_frag_kill() can remove the node and balance the hash reference.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/inet_fragment.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"648700f76b03b7e8149d13cc2bdb3355035258a9\",\"lessThan\":\"f4e4dab62181b7fe7c011bed6fbef9fc3d48c769\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"648700f76b03b7e8149d13cc2bdb3355035258a9\",\"lessThan\":\"4ed0681dc2c1e0538b79d2fc56190ffcb369dacd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"648700f76b03b7e8149d13cc2bdb3355035258a9\",\"lessThan\":\"08a04d7bfb9c103432561aff8a62b6872e694a6a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"648700f76b03b7e8149d13cc2bdb3355035258a9\",\"lessThan\":\"d3ffb89b2944672cf7bdd8e9ee577d2043b4a956\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"648700f76b03b7e8149d13cc2bdb3355035258a9\",\"lessThan\":\"39c6c4b267b65f00e0b0335a2ae00cbe9e3174f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"648700f76b03b7e8149d13cc2bdb3355035258a9\",\"lessThan\":\"9f904dd3e455750e5d4ec9b2f134835811b85a2f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"648700f76b03b7e8149d13cc2bdb3355035258a9\",\"lessThan\":\"928128865e43b197e30688dc1bc991592c97edcf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"648700f76b03b7e8149d13cc2bdb3355035258a9\",\"lessThan\":\"653d7ddf6cba867777a3d14c4f83ace008c5ad13\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"493107105843f299662b3b664a83804645564f12\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.4.174\",\"lessThan\":\"4.5\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/inet_fragment.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.267\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08a04d7bfb9c103432561aff8a62b6872e694a6a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/39c6c4b267b65f00e0b0335a2ae00cbe9e3174f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4ed0681dc2c1e0538b79d2fc56190ffcb369dacd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/653d7ddf6cba867777a3d14c4f83ace008c5ad13\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/928128865e43b197e30688dc1bc991592c97edcf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f904dd3e455750e5d4ec9b2f134835811b85a2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3ffb89b2944672cf7bdd8e9ee577d2043b4a956\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4e4dab62181b7fe7c011bed6fbef9fc3d48c769\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-25T06:06:50+00:00",
      "cve": "CVE-2026-74662",
      "id": "CVE-2026-74662",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "28",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: inet: frags: publish queues before arming timer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74662.json",
      "version": "3"
    }
  }
}



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  • 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.