FKIE_CVE-2025-38112

Vulnerability from fkie_nvd - Published: 2025-07-03 09:15 - Updated: 2025-12-17 18:13
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526daPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.16
debian debian_linux 11.0
To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Fix TOCTOU issue in sk_is_readable()\n\nsk-\u003esk_prot-\u003esock_is_readable is a valid function pointer when sk resides\nin a sockmap. After the last sk_psock_put() (which usually happens when\nsocket is removed from sockmap), sk-\u003esk_prot gets restored and\nsk-\u003esk_prot-\u003esock_is_readable becomes NULL.\n\nThis makes sk_is_readable() racy, if the value of sk-\u003esk_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."
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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