Title: Linux, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:

Revertir  net/smc: Introduce TCP ULP support 

Esto revierte el commit d7cd421da9da2cc7b4d25b8537f66db5c8331c40.

Según lo informado por Al Viro, el soporte TCP ULP para SMC está fundamentalmente roto. La implementación intenta convertir un socket TCP activo en un socket SMC modificando in situ la 'struct file', dentry e inode subyacentes, lo que viola las invariantes centrales de VFS que asumen que estas estructuras son inmutables para un archivo abierto, creando un riesgo de errores de uso después de liberar (use after free) e inestabilidad general del sistema.

Dada la gravedad de este defecto de diseño y el hecho de que existen alternativas más limpias (p. ej., LD_PRELOAD, BPF) para la transparencia de aplicaciones heredadas, el curso de acción correcto es eliminar esta característica por completo.

CWE-416

OR
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.17 up to (excluding) 6.19.4

kernel.org: https://git.kernel.org/stable/c/6c505d95c69e27dbf28fea29dc84d2498d69515c Types: Patch

kernel.org: https://git.kernel.org/stable/c/df31a6b0a3057e66994ad6ccf5d95b9b9514f033 Types: Patch

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/smc/af_smc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"d7cd421da9da2cc7b4d25b8537f66db5c8331c40","lessThan":"6c505d95c69e27dbf28fea29dc84d2498d69515c","versionType":"git","status":"affected"},{"version":"d7cd421da9da2cc7b4d25b8537f66db5c8331c40","lessThan":"df31a6b0a3057e66994ad6ccf5d95b9b9514f033","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/smc/af_smc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"5.17","status":"affected"},{"version":"0","lessThan":"5.17","versionType":"semver","status":"unaffected"},{"version":"6.19.4","lessThanOrEqual":"6.19.*","versionType":"semver","status":"unaffected"},{"version":"7.0","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Revert "net/smc: Introduce TCP ULP support"

This reverts commit d7cd421da9da2cc7b4d25b8537f66db5c8331c40.

As reported by Al Viro, the TCP ULP support for SMC is fundamentally
broken. The implementation attempts to convert an active TCP socket
into an SMC socket by modifying the underlying `struct file`, dentry,
and inode in-place, which violates core VFS invariants that assume
these structures are immutable for an open file, creating a risk of
use after free errors and general system instability.

Given the severity of this design flaw and the fact that cleaner
alternatives (e.g., LD_PRELOAD, BPF) exist for legacy application
transparency, the correct course of action is to remove this feature
entirely.

https://git.kernel.org/stable/c/6c505d95c69e27dbf28fea29dc84d2498d69515c

https://git.kernel.org/stable/c/df31a6b0a3057e66994ad6ccf5d95b9b9514f033