Revert "net/smc: Introduce TCP ULP support"

Answer in brief

CVE-2026-46330 records a High severity (CVSS 7.8) vulnerability in Revert "net/smc: Introduce TCP ULP support". The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 9, 2026Updated Aug 5, 2026Source checked Sep 19, 2026First seen by HOL Jul 7, 2026Material review Aug 5, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=d7cd421da9da2cc7b4d25b8537f66db5c8331c40 <6c505d95c69e27dbf28fea29dc84d2498d69515c \|\| >=d7cd421da9da2cc7b4d25b8537f66db5c8331c40 <df31a6b0a3057e66994ad6ccf5d95b9b9514f033	6c505d95c69e27dbf28fea29dc84d2498d69515c, df31a6b0a3057e66994ad6ccf5d95b9b9514f033
Linux/Linuxgeneric	5.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 6c505d95c69e27dbf28fea29dc84d2498d69515c if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 7, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.