Answer in brief
CVE-2026-68293 records a High severity (CVSS 7.1) vulnerability in net/mlx5: Fix MCIA register buffer overflow on 32 dword reads. 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 7.1. 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 | >=271907ee2f29cd1078fd219f0778fd824fb1971c <5be4eebd5a3a198dab0adcd550e1cadca79bdfed || >=271907ee2f29cd1078fd219f0778fd824fb1971c <87b39a8c875ca744b7de69af0a8ef8874cffccf1 || >=271907ee2f29cd1078fd219f0778fd824fb1971c <88b2a16ddac3357e3f1d528e758b51e2c945d546 || >=271907ee2f29cd1078fd219f0778fd824fb1971c <11c057d23465c7a5817a7284c896d19d54c0b616 | 5be4eebd5a3a198dab0adcd550e1cadca79bdfed, 87b39a8c875ca744b7de69af0a8ef8874cffccf1, 88b2a16ddac3357e3f1d528e758b51e2c945d546, 11c057d23465c7a5817a7284c896d19d54c0b616 |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix MCIA register buffer overflow on 32 dword reads The MCIA register can return up to 32 dwords (128 bytes) when the device advertises the mcia_32dwords capability, but struct mlx5_ifc_mcia_reg_bits only defines dword_0..11, leaving room for just 12 dwords (48 bytes) of data. mlx5_query_mcia() clamps the read size to mlx5_mcia_max_bytes() and then memcpy()s that many bytes out of the register, potentially reading past the end of the 'out' buffer. On kernels built with FORTIFY_SOURCE this is caught as a buffer overflow while reading the module EEPROM via ethtool: detected buffer overflow in memcpy kernel BUG at lib/string_helpers.c:1048! RIP: 0010:fortify_panic+0x13/0x20 Call Trace: mlx5_query_mcia.isra.0+0x200/0x210 [mlx5_core] mlx5_query_module_eeprom_by_page+0x4a/0xa0 [mlx5_core] mlx5e_get_module_eeprom_by_page+0xbb/0x120 [mlx5_core] eeprom_prepare_data+0xf3/0x170 ethnl_default_doit+0xf1/0x3b0 Extend the mcia_reg layout to 32 dwords.
Quoted source text, attributed separately from HOL analysis.