CVE-2025-38112
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.
Does this matter?
Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-367
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91Patch
- https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526daPatch
- https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230Patch
- https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20dPatch
- https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15Patch
- https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336Patch
- https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.