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libceph: Fix slab-out-of-bounds access in auth message processing

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: libceph: Fix slab-out-of-bounds access in auth message processing If a (potentially corrupted) message of type CEPH_MSG_AUTH_REPLY contains a positive value in its result field, it is treated as an error code by ceph_handle_auth_reply() and returned to handle_auth_reply(). Thereafter, an attempt is made to send the preallocated message of type CEPH_MSG_AUTH, where the returned value is interpreted as the size of the front segment to send. If the result value in the message is greater than the size of the memory buffer allocated for the front segment, an out-of-bounds access occurs, and the content of the memory region beyond this buffer is sent out. This patch fixes the issue by treating only negative values in the result field as errors. Positive values are therefore treated as success in the same way as a zero value. Additionally, a BUG_ON is added to __send_prepared_auth_request() comparing the len parameter to front_alloc_len to prevent sending the message if it exceeds the bounds of the allocation and to make it easier to catch any logic flaws leading to this.

Announced Source revision 1
Original source ↗

CVE-2026-46119

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-2026-46119

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": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc",
        "lessThan": "c2374b92c729d0388a538b3cde7b3e3b5e55ef39",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc",
        "lessThan": "38fdf04c602d52c42c67fc1617211492753b7e8b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc",
        "lessThan": "2ae0afd98432536562fa8261538ae795446f0589",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc",
        "lessThan": "408e85ee708b6aa03eeb0220ffa0915f4d407181",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc",
        "lessThan": "b7df9fbd4869fdfe09a3f501ffd228486521e062",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc",
        "lessThan": "8517b6c8d2c759918ba0058cb6c7e14d59643202",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc",
        "lessThan": "1c439de70b1c3eb3c6bffa8245c16b9fc318f114",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ceph/auth.c",
      "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": "2.6.34"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.34",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.88",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.30",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ceph/auth.c",
      "net/ceph/mon_client.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46119

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40125 · Revision 1
Added to Heist Feed
Publisher date
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