CVE-2026-46330Revert "net/smc: Introduce TCP ULP support"
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d7cd421da9da2cc7b4d25b8537f66db5c8331c40 before dc24e03be0e4bb2aad1a9b272c4f86de3b11969a; from d7cd421da9da2cc7b4d25b8537f66db5c8331c40 before 6c505d95c69e27dbf28fea29dc84d2498d69515c; from d7cd421da9da2cc7b4d25b8537f66db5c8331c40 before df31a6b0a3057e66994ad6ccf5d95b9b9514f033 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.17 before 6.19.4 | NVD |
References
- https://git.kernel.org/stable/c/dc24e03be0e4bb2aad1a9b272c4f86de3b11969a
- https://git.kernel.org/stable/c/6c505d95c69e27dbf28fea29dc84d2498d69515cpatch
- https://git.kernel.org/stable/c/df31a6b0a3057e66994ad6ccf5d95b9b9514f033patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.