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libceph: Use u32 for non-negative values in ceph_monmap_decode()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: libceph: Use u32 for non-negative values in ceph_monmap_decode() This patch fixes unnecessary implicit conversions that change signedness of blob_len and num_mon in ceph_monmap_decode(). Currently blob_len and num_mon are (signed) int variables. They are used to hold values that are always non-negative and get assigned in ceph_decode_32_safe(), which is meant to assign u32 values. Both variables are subsequently used as unsigned values, and the value of num_mon is further assigned to monmap->num_mon, which is of type u32. Therefore, both variables should be of type u32. This is especially relevant for num_mon. If the value read from the incoming message is very large, it is interpreted as a negative value, and the check for num_mon > CEPH_MAX_MON does not catch it. This leads to the attempt to allocate a very large chunk of memory for monmap, which will most likely fail. In this case, an unnecessary attempt to allocate memory is performed, and -ENOMEM is returned instead of -EINVAL.

Announced Source revision 1
Original source ↗

CVE-2026-43405

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-43405

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
        "lessThan": "ee5588e2bc41acb73f6676c0520420c107cd0140",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
        "lessThan": "86f7060cd638d6eb042e8ed780fb83a59ca0dcb3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
        "lessThan": "5f2806684b05bd24d05c091083b8e2517ba8ffac",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
        "lessThan": "b268984ae88cb0dcd7a8e8263962c748448e26e8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
        "lessThan": "ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
        "lessThan": "08bc6173fd611ad5a40f472bf5f15b92aea0fe40",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
        "lessThan": "770444611f047dbfd4517ec0bc1b179d40c2f346",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ceph/mon_client.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.19",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ceph/mon_client.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43405

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40072 · Revision 1
Added to Heist Feed
Publisher date
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