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bpf: avoid holding freeze_mutex during mmap operation

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: avoid holding freeze_mutex during mmap operation We use map->freeze_mutex to prevent races between map_freeze() and memory mapping BPF map contents with writable permissions. The way we naively do this means we'll hold freeze_mutex for entire duration of all the mm and VMA manipulations, which is completely unnecessary. This can potentially also lead to deadlocks, as reported by syzbot in [0]. So, instead, hold freeze_mutex only during writeability checks, bump (proactively) "write active" count for the map, unlock the mutex and proceed with mmap logic. And only if something went wrong during mmap logic, then undo that "write active" counter increment. [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/

Announced Source revision 1
Original source ↗

CVE-2025-21853

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-2025-21853

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": "fc9702273e2edb90400a34b3be76f7b08fa3344b",
        "lessThan": "2ce31c97c219b4fe797749f950274f246eb88c49",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fc9702273e2edb90400a34b3be76f7b08fa3344b",
        "lessThan": "0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fc9702273e2edb90400a34b3be76f7b08fa3344b",
        "lessThan": "4759acbd44d24a69b7b14848012ec4201d6c5501",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fc9702273e2edb90400a34b3be76f7b08fa3344b",
        "lessThan": "29cfda62ab4d92ab94123813db49ab76c1e61b29",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fc9702273e2edb90400a34b3be76f7b08fa3344b",
        "lessThan": "d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fc9702273e2edb90400a34b3be76f7b08fa3344b",
        "lessThan": "271e49f8a58edba65bc2b1250a0abaa98c4bfdbe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fc9702273e2edb90400a34b3be76f7b08fa3344b",
        "lessThan": "bc27c52eea189e8f7492d40739b7746d67b65beb",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/bpf/syscall.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.237",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.181",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.135",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.17",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.13.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.13.*"
      },
      {
        "status": "unaffected",
        "version": "6.14",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/bpf/syscall.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-21853

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26958 · Revision 1
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Publisher date
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