4.7

CVE-2025-38112

net: Fix TOCTOU issue in sk_is_readable()

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

net: Fix TOCTOU issue in sk_is_readable()

sk->sk_prot->sock_is_readable is a valid function pointer when sk resides
in a sockmap. After the last sk_psock_put() (which usually happens when
socket is removed from sockmap), sk->sk_prot gets restored and
sk->sk_prot->sock_is_readable becomes NULL.

This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded
after the initial check. Which in turn may lead to a null pointer
dereference.

Ensure the function pointer does not turn NULL after the check.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.17 < 5.10.239
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.186
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.142
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.94
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.34
Linux ≫ Linux Kernel Version >= 6.13 < 6.15.3
Linux ≫ Linux Kernel Version6.16 Updaterc1
Debian ≫ Debian Linux Version11.0
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.12% 0.021
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 4.7 1 3.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336
Patch
https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d
Patch
https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15
Patch
https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310
Patch
https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da
Patch
https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91
Patch
https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Third Party Advisory