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md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime After commit ec6bb299c7c3 ("md/md-bitmap: add 'sync_size' into struct md_bitmap_stats"), following panic is reported: Oops: general protection fault, probably for non-canonical address RIP: 0010:bitmap_get_stats+0x2b/0xa0 Call Trace: md_seq_show+0x2d2/0x5b0 seq_read_iter+0x2b9/0x470 seq_read+0x12f/0x180 proc_reg_read+0x57/0xb0 vfs_read+0xf6/0x380 ksys_read+0x6c/0xf0 do_syscall_64+0x82/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e Root cause is that bitmap_get_stats() can be called at anytime if mddev is still there, even if bitmap is destroyed, or not fully initialized. Deferenceing bitmap in this case can crash the kernel. Meanwhile, the above commit start to deferencing bitmap->storage, make the problem easier to trigger. Fix the problem by protecting bitmap_get_stats() with bitmap_info.mutex.

Announced Source revision 1
Original source ↗

CVE-2025-21712

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-2025-21712

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": "32a7627cf3a35396a8e834faf34e38ae9f3b1309",
        "lessThan": "eb2f9d98cd3e94a79fbf8fb90637c5b12e805428",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a7627cf3a35396a8e834faf34e38ae9f3b1309",
        "lessThan": "032fa54f486eac5507976e7e31f079a767bc13a8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a7627cf3a35396a8e834faf34e38ae9f3b1309",
        "lessThan": "52848a095b55a302af92f52ca0de5b3112059bb8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a7627cf3a35396a8e834faf34e38ae9f3b1309",
        "lessThan": "237e19519c8ff6949f0ef57c4a0243f5b2b0fa18",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a7627cf3a35396a8e834faf34e38ae9f3b1309",
        "lessThan": "4e9316eee3885bfb311b4759513f2ccf37891c09",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "32a7627cf3a35396a8e834faf34e38ae9f3b1309",
        "lessThan": "8d28d0ddb986f56920ac97ae704cc3340a699a30",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/md/md-bitmap.c",
      "drivers/md/md.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.13",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.13.2",
        "versionType": "semver",
        "lessThanOrEqual": "6.13.*"
      },
      {
        "status": "unaffected",
        "version": "6.14",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/md/md-bitmap.c",
      "drivers/md/md.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-21712

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30429 · Revision 1
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Publisher date
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