CVE-2026-52958 (GCVE-0-2026-52958)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-06-28 06:37
VLAI
Title
libceph: Fix potential out-of-bounds access in osdmap_decode()
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in osdmap_decode() When decoding osd_state and osd_weight from an incoming osdmap in osdmap_decode(), both are decoded for each osd, i.e., map->max_osd times. The ceph_decode_need() check only accounts for sizeof(*map->osd_weight) once. This can potentially result in an out-of-bounds memory access if the incoming message is corrupted such that the max_osd value exceeds the actual content of the osdmap message. This patch fixes the issue by changing the corresponding part in the ceph_decode_need() check to account for map->max_osd*sizeof(*map->osd_weight).
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dcbc919a5dc8c2629684a113a90c0b6fe10c3462 , < 36a79759a288961b1ff28a68ec2d1f56f6848098 (git)
Affected: dcbc919a5dc8c2629684a113a90c0b6fe10c3462 , < 3f2575bb7f955d42569d96c3e04fa958a0dcf4b4 (git)
Affected: dcbc919a5dc8c2629684a113a90c0b6fe10c3462 , < 8713bbc4b2b9ad78f803978e54b7e49dd21bd9be (git)
Affected: dcbc919a5dc8c2629684a113a90c0b6fe10c3462 , < 0d2dd7e6bb74fd7712aa73457a4a821906c6863a (git)
Affected: dcbc919a5dc8c2629684a113a90c0b6fe10c3462 , < e7187f33c02488697ec0d01d82bf7a3f8deaba8f (git)
Affected: dcbc919a5dc8c2629684a113a90c0b6fe10c3462 , < 48df98d12b15360cd56af5c1f460307b340c1197 (git)
Affected: dcbc919a5dc8c2629684a113a90c0b6fe10c3462 , < ee933694645dac062d65fc2743f92bc06fa0db6b (git)
Affected: dcbc919a5dc8c2629684a113a90c0b6fe10c3462 , < 35d0ed82d03e5ee77ea4f31f20e29562a7721649 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52958",
    "datePublished": "2026-06-24T16:28:39.723Z",
    "dateReserved": "2026-06-09T07:44:35.373Z",
    "dateUpdated": "2026-06-28T06:37:19.643Z",
    "state": "PUBLISHED"
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This can potentially result in an\\nout-of-bounds memory access if the incoming message is corrupted such\\nthat the max_osd value exceeds the actual content of the osdmap message.\\n\\nThis patch fixes the issue by changing the corresponding part in the\\nceph_decode_need() check to account for\\nmap-\u003emax_osd*sizeof(*map-\u003eosd_weight).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ceph/osdmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"dcbc919a5dc8c2629684a113a90c0b6fe10c3462\",\"lessThan\":\"36a79759a288961b1ff28a68ec2d1f56f6848098\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dcbc919a5dc8c2629684a113a90c0b6fe10c3462\",\"lessThan\":\"3f2575bb7f955d42569d96c3e04fa958a0dcf4b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dcbc919a5dc8c2629684a113a90c0b6fe10c3462\",\"lessThan\":\"8713bbc4b2b9ad78f803978e54b7e49dd21bd9be\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dcbc919a5dc8c2629684a113a90c0b6fe10c3462\",\"lessThan\":\"0d2dd7e6bb74fd7712aa73457a4a821906c6863a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dcbc919a5dc8c2629684a113a90c0b6fe10c3462\",\"lessThan\":\"e7187f33c02488697ec0d01d82bf7a3f8deaba8f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dcbc919a5dc8c2629684a113a90c0b6fe10c3462\",\"lessThan\":\"48df98d12b15360cd56af5c1f460307b340c1197\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dcbc919a5dc8c2629684a113a90c0b6fe10c3462\",\"lessThan\":\"ee933694645dac062d65fc2743f92bc06fa0db6b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dcbc919a5dc8c2629684a113a90c0b6fe10c3462\",\"lessThan\":\"35d0ed82d03e5ee77ea4f31f20e29562a7721649\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ceph/osdmap.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\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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:N/A:H\",\"baseScore\":9.1,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0d2dd7e6bb74fd7712aa73457a4a821906c6863a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/35d0ed82d03e5ee77ea4f31f20e29562a7721649\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/36a79759a288961b1ff28a68ec2d1f56f6848098\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3f2575bb7f955d42569d96c3e04fa958a0dcf4b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48df98d12b15360cd56af5c1f460307b340c1197\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8713bbc4b2b9ad78f803978e54b7e49dd21bd9be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e7187f33c02488697ec0d01d82bf7a3f8deaba8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee933694645dac062d65fc2743f92bc06fa0db6b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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

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.