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

Vulnerability from cvelistv5 – Published: 2025-01-19 10:17 – Updated: 2025-11-03 20:58
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 ?
No CVSS data available.
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)
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    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)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: auth_enable: avoid using current-\u003ensproxy\n\nAs mentioned in a previous commit of this series, using the \u0027net\u0027\nstructure via \u0027current\u0027 is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader\u0027s/writer\u0027s netns vs only\n  from the opener\u0027s netns.\n\n- current-\u003ensproxy can be NULL in some cases, resulting in an \u0027Oops\u0027\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe \u0027net\u0027 structure can be obtained from the table-\u003edata using\ncontainer_of().\n\nNote that table-\u003edata could also be used directly, but that would\nincrease the size of this fix, while \u0027sctp.ctl_sock\u0027 still needs to be\nretrieved from \u0027net\u0027 structure."
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          "url": "https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695"
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      "title": "sctp: sysctl: auth_enable: avoid using current-\u003ensproxy",
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  • 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.
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