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. 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 v3 4.7 MEDIUM

4.7^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.0 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91	Patch
https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da	Patch
https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230	Patch
https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d	Patch
https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15	Patch
https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336	Patch
https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310	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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.16:rc1::::::

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2025-07-03 09:15

Updated : 2025-12-17 18:13

NVD link : CVE-2025-38112

Mitre link : CVE-2025-38112

CVE.ORG link : CVE-2025-38112

JSON object : View

Products Affected

debian

debian_linux

linux

linux_kernel

CWE

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

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After the last sk_psock_put() (which usually happens when\nsocket is removed from sockmap), sk->sk_prot gets restored and\nsk->sk_prot->sock_is_readable becomes NULL.\n\nThis makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded\nafter the initial check. Which in turn may lead to a null pointer\ndereference.\n\nEnsure the function pointer does not turn NULL after the check."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: Se solucion\u00f3 el problema de TOCTOU en sk_is_readable(). sk->sk_prot->sock_is_readable es un puntero a funci\u00f3n v\u00e1lido cuando sk reside en un mapa de sockets. Tras el \u00faltimo sk_psock_put() (que suele ocurrir al eliminar un socket de un mapa de sockets), sk->sk_prot se restaura y sk->sk_prot->sock_is_readable se convierte en NULL. Esto hace que sk_is_readable() sea arriesgado si el valor de sk->sk_prot se recarga despu\u00e9s de la comprobaci\u00f3n inicial. Esto, a su vez, puede provocar una desreferencia de puntero nulo. Aseg\u00farese de que el puntero a funci\u00f3n no se convierta en NULL despu\u00e9s de la comprobaci\u00f3n."}], "lastModified": "2025-12-17T18:13:47.267", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "30CEFAA7-EE3A-415E-A006-A2F534E88EAC", "versionEndExcluding": "5.10.239", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D96F2C0D-0D4A-4658-AD34-D8A626EA422D", "versionEndExcluding": "5.15.186", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "459B4E94-FE0E-434D-B782-95E3A5FFC6B1", "versionEndExcluding": "6.1.142", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "304E3F01-7D7A-4908-994E-7F95C5C00B06", "versionEndExcluding": "6.6.94", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4FFA54AA-CDFE-4591-BD07-72813D0948F4", "versionEndExcluding": "6.12.34", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0541C761-BD5E-4C1A-8432-83B375D7EB92", "versionEndExcluding": "6.15.3", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}