5.5

CVE-2025-21641

mptcp: sysctl: blackhole timeout: avoid using current->nsproxy

In the Linux kernel, the following vulnerability has been resolved:

mptcp: sysctl: blackhole timeout: avoid using current->nsproxy

As mentioned in the previous commit, 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 'pernet' structure can be obtained from the table->data using
container_of().
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.12 < 6.12.10
Linux ≫ Linux Kernel Version 6.13 Update rc1
Linux ≫ Linux Kernel Version 6.13 Update rc2
Linux ≫ Linux Kernel Version 6.13 Update rc3
Linux ≫ Linux Kernel Version 6.13 Update rc4
Linux ≫ Linux Kernel Version 6.13 Update rc5
Linux ≫ Linux Kernel Version 6.13 Update rc6
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.18% 0.073
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA-ADP 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7
Patch
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https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289
Patch
Mailing List