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)
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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)
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              "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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        "id": "CVE-2026-74567",
        "lastModified": "2026-08-19T17:21:11.563",
        "metrics": {
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                "attackVector": "LOCAL",
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                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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        "published": "2026-08-15T13:18:02.227",
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        "vulnStatus": "Received"
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      "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": "2026-09-18T00:26:23Z",
      "cve": "CVE-2026-74567",
      "id": "CVE-2026-74567",
      "initial_release_date": "2026-08-15T23:50:01Z",
      "product_status:known_affected": "626",
      "product_status:known_not_affected": "93",
      "product_status:recommended": "107",
      "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": "11"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.