Skip to content
Heist/ feed
High

sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: cookie_hmac_alg: 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.sctp_hmac_alg' is used.

Announced Source revision 1
Original source ↗

CVE-2025-21640

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-2025-21640

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": "3c68198e75111a905ac2412be12bf7b29099729b",
        "lessThan": "5599b212d2f4466e1832a94e9932684aaa364587",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3c68198e75111a905ac2412be12bf7b29099729b",
        "lessThan": "03ca51faba2b017bf6c90e139434c4117d0afcdc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3c68198e75111a905ac2412be12bf7b29099729b",
        "lessThan": "86ddf8118123cb58a0fb8724cad6979c4069065b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3c68198e75111a905ac2412be12bf7b29099729b",
        "lessThan": "3cd0659deb9c03535fd61839e91d4d4d3e51ac71",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3c68198e75111a905ac2412be12bf7b29099729b",
        "lessThan": "ad673e514b2793b8d5902f6ba6ab7e890dea23d5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3c68198e75111a905ac2412be12bf7b29099729b",
        "lessThan": "f0bb3935470684306e4e04793a20ac4c4b08de0b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3c68198e75111a905ac2412be12bf7b29099729b",
        "lessThan": "ea62dd1383913b5999f3d16ae99d411f41b528d4",
        "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": "3.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.292",
        "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-2025-21640

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30424 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement