CVE-2026-46330 is a vulnerability in Linux Kernel
Published on June 9, 2026
Revert "net/smc: Introduce TCP ULP support"
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.
Products Associated with CVE-2026-46330
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Affected Versions
Linux:- Version d7cd421da9da2cc7b4d25b8537f66db5c8331c40 and below 6c505d95c69e27dbf28fea29dc84d2498d69515c is affected.
- Version d7cd421da9da2cc7b4d25b8537f66db5c8331c40 and below df31a6b0a3057e66994ad6ccf5d95b9b9514f033 is affected.
- Version 5.17 is affected.
- Before 5.17 is unaffected.
- Version 6.19.4, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.