Answer in brief
CVE-2026-64522 records a High severity (CVSS 8.8) vulnerability in net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA. 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.
CVSS is 8.8. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 <b5bd4249e430f5963d559708ee96a671716d2400 || >=22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 <ecafd8284e527666e83261e6e57a7c7341d591cb || >=22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 <abe003b33223ff33552f291644bf35d9c2f992fb || 993c4ba71596c30418ba5a0ddcf4f9c2f431466a || >=6.17.4 <6.18 | b5bd4249e430f5963d559708ee96a671716d2400, ecafd8284e527666e83261e6e57a7c7341d591cb, abe003b33223ff33552f291644bf35d9c2f992fb, 6.18 |
| Linux/Linuxgeneric | 6.18 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA mlx5e_xfrm_add_state() handles acquire-flow temporary SAs by allocating software state and skipping hardware offload setup. That path jumps to the common success label before taking the eswitch mode block. After tunnel-mode validation was moved earlier, the common success label unconditionally calls mlx5_eswitch_unblock_mode(). For acquire SAs, this decrements esw->offloads.num_block_mode without a matching increment. Return directly after installing the acquire SA offload handle, so only the paths that successfully called mlx5_eswitch_block_mode() call the matching unblock.
Quoted source text, attributed separately from HOL analysis.