Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2025-21640

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.292, 5.10.234, 5.15.177, 6.1.125, 6.6.72, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 3c68198e75111a905ac2412be12bf7b29099729b · fixed in 5599b212d2f4466e1832a94e9932684aaa364587; From 3c68198e75111a905ac2412be12bf7b29099729b · fixed in 03ca51faba2b017bf6c90e139434c4117d0afcdc; From 3c68198e75111a905ac2412be12bf7b29099729b · fixed in 86ddf8118123cb58a0fb8724cad6979c4069065b; From 3c68198e75111a905ac2412be12bf7b29099729b · fixed in 3cd0659deb9c03535fd61839e91d4d4d3e51ac71; From 3c68198e75111a905ac2412be12bf7b29099729b · fixed in ad673e514b2793b8d5902f6ba6ab7e890dea23d5; From 3c68198e75111a905ac2412be12bf7b29099729b · fixed in f0bb3935470684306e4e04793a20ac4c4b08de0b; From 3c68198e75111a905ac2412be12bf7b29099729b · fixed in ea62dd1383913b5999f3d16ae99d411f41b528d4

  • Linux Linux

    3.8

  • KernelLinux

    From 3.8.0 · fixed in 5.4.292; From 5.5.0 · fixed in 5.10.234; From 5.11.0 · fixed in 5.15.177; From 5.16.0 · fixed in 6.1.125; From 6.2.0 · fixed in 6.6.72; From 6.7.0 · fixed in 6.12.10

References 7

git.kernel.org