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mm/secretmem: properly account locked pages

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: mm/secretmem: properly account locked pages secretmem accounts folios by treating memory as if it were mlock()'d and thus limited by the RLIMIT_MEMLOCK limit. However the folios are unevictable and remain so until the inode is evicted, eliminating usual mlock() semantics - mapping folios then unmapping them does not clear their unevictable state, since it depends on AS_UNEVICTABLE, not PG_mlocked. A user can therefore easily work around the RLIMIT_MEMLOCK limit - simply map then unmap and VmLck no longer counts the secretmem range. Worse, folios are not accounted in the process's RSS, meaning the OOM killer won't know to kill the process. Repeatedly mapping/unmapping (or forking) can then result in the consumption of all available system memory with unevictable folios and cause system instability. A secretmem fd can be passed between processes and over fork so a per-process limit simply does not make sense, so follow the precedent set by io_uring, perf, skbuff, iommufd and xdp by tracking the number of locked pages in user_struct->locked_vm. Since the scope tracked is actually inode lifetime, the RLIMIT_MEMLOCK applies per-user not per-process, so it doesn't make sense to bypass for users with CAP_IPC_LOCK, therefore remove this bypass. There is simply no reason to carry on marking the mapping as mlock()'d since it's misleading and the lifecycle is now correctly handled, so remove this too. Note that secretme

Announced Source revision 1
Original source ↗

CVE-2026-93243

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-2026-93243

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "51fba083e454f901947d6a335eeff671171d4714",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "a41c95ac90f285cbe473b9606428b14518896ea4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "853043cb129473ff2fa0090602be944d96b9d5c9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "3b4f72bdddff69819d665395376329ef21f37a06",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "97d34aa65c29cca85e3e9050f4c936389b38a054",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/linux/sched/user.h",
      "mm/secretmem.c",
      "tools/testing/selftests/mm/memfd_secret.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/linux/sched/user.h",
      "mm/secretmem.c",
      "tools/testing/selftests/mm/memfd_secret.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93243

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#48741 · Revision 1
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Publisher date
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