CVE-2025-21638 (GCVE-0-2025-21638)

Vulnerability from cvelistv5 – Published: 2025-01-19 10:17 – Updated: 2026-08-05 11:53
VLAI
Title
sctp: sysctl: auth_enable: avoid using current->nsproxy
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: auth_enable: 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, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b14878ccb7fac0242db82720b784ab62c467c0dc , < cf387cdebfaebae228dfba162f94c567a67610c3 (git)
Affected: b14878ccb7fac0242db82720b784ab62c467c0dc , < dc583e7e5f8515ca489c0df28e4362a70eade382 (git)
Affected: b14878ccb7fac0242db82720b784ab62c467c0dc , < bd2a2939423566c654545fa3e96a656662a0af9e (git)
Affected: b14878ccb7fac0242db82720b784ab62c467c0dc , < 1b67030d39f2b00f94ac1f0af11ba6657589e4d3 (git)
Affected: b14878ccb7fac0242db82720b784ab62c467c0dc , < 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 (git)
Affected: b14878ccb7fac0242db82720b784ab62c467c0dc , < c184bc621e3cef03ac9ba81a50dda2dae6a21d36 (git)
Affected: b14878ccb7fac0242db82720b784ab62c467c0dc , < 15649fd5415eda664ef35780c2013adeb5d9c695 (git)
Affected: e5eae4a0511241959498b180fa0df0d4f1b11b9c (git)
Affected: 88830f227a1f96e44d82ddfcb0cc81d517ec6dd8 (git)
Affected: 3938b0336a93fa5faa242dc9e5823ac69df9e066 (git)
Affected: 3.10.41 , < 3.11 (semver)
Affected: 3.12.21 , < 3.13 (semver)
Affected: 3.14.5 , < 3.15 (semver)
Create a notification for this product.
Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.4.292 , ≤ 5.4.* (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.177 , ≤ 5.15.* (semver)
Unaffected: 6.1.125 , ≤ 6.1.* (semver)
Unaffected: 6.6.72 , ≤ 6.6.* (semver)
Unaffected: 6.12.10 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Show details on NVD website
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La estructura \u0027net\u0027 se puede obtener de table-\u0026gt;data usando Container_of(). Tenga en cuenta que table-\u0026gt;data tambi\u00e9n se puede usar directamente, pero eso aumentar\u00eda el tama\u00f1o de esta correcci\u00f3n, mientras que \u0027sctp.ctl_sock\u0027 a\u00fan necesita ser recuperado de la estructura 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-30T10:13:53+00:00",
      "cve": "CVE-2025-21638",
      "id": "CVE-2025-21638",
      "initial_release_date": "2025-01-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: sysctl: auth_enable: avoid using current-\u003ensproxy",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21638.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-31T01:21:20Z",
      "cve": "CVE-2025-21638",
      "id": "CVE-2025-21638",
      "initial_release_date": "2025-01-20T03:47:45Z",
      "product_status:known_affected": "663",
      "product_status:known_not_affected": "42",
      "product_status:recommended": "403",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21638",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21638.json",
      "version": "61"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.