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CVE-2026-74567 (GCVE-0-2026-74567)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:28 – Updated: 2026-08-19 16:39
VLAI
Title
keys: fix out-of-bounds read in keyring_get_key_chunk()
Summary
In the Linux kernel, the following vulnerability has been resolved: keys: fix out-of-bounds read in keyring_get_key_chunk() For description-level chunks keyring_get_key_chunk() advances the read pointer by level * sizeof(long) past the inline prefix but only bounds-checks the prefix, so a long enough key description is read past its kmemdup(desc, desc_len + 1) allocation. Compute the full byte offset and bounds-check the description against it before reading. The walk only reaches a description-level chunk when two keys collide through the hash, x, type and domain_tag chunks, so this is reached from an unprivileged add_key(2) with a crafted pair of same-type keys whose index hashes collide; KASAN reports a slab-out-of-bounds read.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b (git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 79916f40d4ab1b4ae694d8c024fd179454bfe46e (git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < e5b01998cef8d7f613200230ccaadebe5de9135c (git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < d1933e03e8c74a018550c31a393b79c4d95bff40 (git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 3a744838453fb9309ce5a5526d3252e211d60152 (git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < e9417d21a22ad2ec398e78fcf084b717ce92cf2f (git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 8dba33c1e779d0fb9a2acb31e354cf0fc0229111 (git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 63918731f9ae25b5deb022f118e941e6dddfcef4 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: fix out-of-bounds read in keyring_get_key_chunk()\n\nFor description-level chunks keyring_get_key_chunk() advances the read\npointer by level * sizeof(long) past the inline prefix but only\nbounds-checks the prefix, so a long enough key description is read past\nits kmemdup(desc, desc_len + 1) allocation.  Compute the full byte\noffset and bounds-check the description against it before reading.\n\nThe walk only reaches a description-level chunk when two keys collide\nthrough the hash, x, type and domain_tag chunks, so this is reached from\nan unprivileged add_key(2) with a crafted pair of same-type keys whose\nindex hashes collide; KASAN reports a slab-out-of-bounds read."
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            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - The flaw is reached only through local key-management syscalls (add_key, keyctl link/search) that walk the keyring assoc_array in security/keys/keyring.c; the keys subsystem has no network-facing handler or remote packet path.\nAC:L - An attacker fully controls both key descriptions and can offline-compute a same-type pair whose index collides through hash, x, type and domain_tag yet differs later, deterministically forcing description-level chunks without races or uncontrollable layout.\nPR:L - The fix commit and add_key path confirm any unprivileged local user can add crafted keys to their own session/user keyring (lookup_user_key with KEY_NEED_WRITE); no real-root capability or init-namespace privilege is required.\nUI:N - Exploitation is self-contained: the attacker issues add_key twice with crafted colliding descriptions into a writable keyring they own; no action by another user or administrator is required.\nS:U - The out-of-bounds slab read and any disclosed data remain within the host kernel\u0027s security authority; this is standard local kernel memory access, not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - keyring_get_key_chunk() reads up to a word past the kmemdup(desc,desc_len+1) allocation when the offset includes level*sizeof(long), yielding an adjacent-heap read primitive that can disclose kernel pointers and other sensitive slab contents.\nI:N - This is a read-only out-of-bounds access with no kernel memory write, type confusion, or control-flow hijack; the bug discloses data but does not directly modify kernel or victim integrity.\nA:H - KASAN reports slab-out-of-bounds on trigger, and reading beyond the description allocation can fault at slab/page boundaries; the add_key insertion path is trivially repeatable for denial-of-service."
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      "date": "2026-09-10",
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      "cve": "CVE-2026-74567",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "keys: fix out-of-bounds read in keyring_get_key_chunk()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74567.json",
      "version": "2"
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Compute the full byte\\noffset and bounds-check the description against it before reading.\\n\\nThe walk only reaches a description-level chunk when two keys collide\\nthrough the hash, x, type and domain_tag chunks, so this is reached from\\nan unprivileged add_key(2) with a crafted pair of same-type keys whose\\nindex hashes collide; KASAN reports a slab-out-of-bounds read.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"security/keys/keyring.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f771fde82051976a6fc0fd570f8b86de4a92124b\",\"lessThan\":\"4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f771fde82051976a6fc0fd570f8b86de4a92124b\",\"lessThan\":\"79916f40d4ab1b4ae694d8c024fd179454bfe46e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f771fde82051976a6fc0fd570f8b86de4a92124b\",\"lessThan\":\"e5b01998cef8d7f613200230ccaadebe5de9135c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f771fde82051976a6fc0fd570f8b86de4a92124b\",\"lessThan\":\"d1933e03e8c74a018550c31a393b79c4d95bff40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f771fde82051976a6fc0fd570f8b86de4a92124b\",\"lessThan\":\"3a744838453fb9309ce5a5526d3252e211d60152\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f771fde82051976a6fc0fd570f8b86de4a92124b\",\"lessThan\":\"e9417d21a22ad2ec398e78fcf084b717ce92cf2f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f771fde82051976a6fc0fd570f8b86de4a92124b\",\"lessThan\":\"8dba33c1e779d0fb9a2acb31e354cf0fc0229111\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f771fde82051976a6fc0fd570f8b86de4a92124b\",\"lessThan\":\"63918731f9ae25b5deb022f118e941e6dddfcef4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"security/keys/keyring.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"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:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3a744838453fb9309ce5a5526d3252e211d60152\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/63918731f9ae25b5deb022f118e941e6dddfcef4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79916f40d4ab1b4ae694d8c024fd179454bfe46e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8dba33c1e779d0fb9a2acb31e354cf0fc0229111\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1933e03e8c74a018550c31a393b79c4d95bff40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e5b01998cef8d7f613200230ccaadebe5de9135c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e9417d21a22ad2ec398e78fcf084b717ce92cf2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T09:45:21+00:00",
      "cve": "CVE-2026-74567",
      "id": "CVE-2026-74567",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: keys: fix out-of-bounds read in keyring_get_key_chunk()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74567.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-09T00:00:07Z",
      "cve": "CVE-2026-74567",
      "id": "CVE-2026-74567",
      "initial_release_date": "2026-08-15T23:50:01Z",
      "product_status:first_fixed": "83",
      "product_status:known_affected": "252",
      "product_status:known_not_affected": "93",
      "product_status:recommended": "11",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74567",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74567.json",
      "version": "5"
    }
  }
}



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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.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.