VulnerabilityPublished 3 Jul 2025Updated 5 Nov 2026

CVE-2025-38112: Linux kernel · net: Fix TOCTOU issue in sk_is_readable()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ff55c85a923e043d59d26b20a673a1b4a219c310 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in ff55c85a923e043d59d26b20a673a1b4a219c310, c2b26638476baee154920bb587fc94ff1bf04336, 8926a7ef1977a832dd6bf702f1a99303dbf15b15 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8934ce2fd08171e8605f7fada91ee7619fe17ab8, < ff55c85a923e043d59d26b20a673a1b4a219c310	Fixed in ff55c85a923e043d59d26b20a673a1b4a219c310
LinuxLinux	Affected ≥ 8934ce2fd08171e8605f7fada91ee7619fe17ab8, < c2b26638476baee154920bb587fc94ff1bf04336	Fixed in c2b26638476baee154920bb587fc94ff1bf04336
LinuxLinux	Affected ≥ 8934ce2fd08171e8605f7fada91ee7619fe17ab8, < 8926a7ef1977a832dd6bf702f1a99303dbf15b15	Fixed in 8926a7ef1977a832dd6bf702f1a99303dbf15b15
LinuxLinux	Affected ≥ 8934ce2fd08171e8605f7fada91ee7619fe17ab8, < 2660a544fdc0940bba15f70508a46cf9a6491230	Fixed in 2660a544fdc0940bba15f70508a46cf9a6491230
LinuxLinux	Affected ≥ 8934ce2fd08171e8605f7fada91ee7619fe17ab8, < 6fa68d7eab34d448a61aa24ea31e68b3231ed20d	Fixed in 6fa68d7eab34d448a61aa24ea31e68b3231ed20d
LinuxLinux	Affected ≥ 8934ce2fd08171e8605f7fada91ee7619fe17ab8, < 1e0de7582ceccbdbb227d4e0ddf65732f92526da	Fixed in 1e0de7582ceccbdbb227d4e0ddf65732f92526da

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.

References

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