Answer in brief
CVE-2026-64522 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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
Aug 5, 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.
Answer in brief
CVE-2026-64522 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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
Aug 5, 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.