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sctp: sysctl: rto_min/max: avoid using current->nsproxy

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: rto_min/max: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.rto_min/max' is used.

Announced Source revision 1
Original source ↗

CVE-2025-21639

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-2025-21639

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": "4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5",
        "lessThan": "c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5",
        "lessThan": "246428bfb9e7db15c5cd08e1d0eca41b65af2b06",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5",
        "lessThan": "0f78f09466744589e420935e646ae78212a38290",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5",
        "lessThan": "4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5",
        "lessThan": "dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5",
        "lessThan": "c87f1f6ade56c711f8736901e330685b453e420e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5",
        "lessThan": "9fc17b76fc70763780aa78b38fcf4742384044a5",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sctp/sysctl.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.290",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.234",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.177",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.125",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.72",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.13",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sctp/sysctl.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-21639

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26896 · Revision 1
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Publisher date
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