Answer in brief
CVE-2026-45865 records a Medium severity (CVSS 5.5) vulnerability in mctp i2c: initialise event handler read bytes. 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 5.5. 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 | >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <93e01e837e105299f1c259ef71f6e1ec4fe806e3 || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <11f83253244060b5de5eac787f61ae3f3e559d01 || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <fa9861e5c8af7651dddfa8d490aaada17ae33b6c || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <6ff2ebfef75fbc57d937d8fbe738b967edf2d331 || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <1eeedb310229bfee9dd4d992e5bba33fe1378a8f || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <2a14e91b6d76639dac70ea170f4384c1ee3cb48d | 93e01e837e105299f1c259ef71f6e1ec4fe806e3, 11f83253244060b5de5eac787f61ae3f3e559d01, fa9861e5c8af7651dddfa8d490aaada17ae33b6c, 6ff2ebfef75fbc57d937d8fbe738b967edf2d331, 1eeedb310229bfee9dd4d992e5bba33fe1378a8f, 2a14e91b6d76639dac70ea170f4384c1ee3cb48d |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
In the Linux kernel, the following vulnerability has been resolved: mctp i2c: initialise event handler read bytes Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads will return "val" from the i2c bus driver. For i2c-aspeed and i2c-npcm7xx that is a stack uninitialised u8. Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c instance, now it returns all 0xff.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-45865 records a Medium severity (CVSS 5.5) vulnerability in mctp i2c: initialise event handler read bytes. 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 5.5. 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 | >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <93e01e837e105299f1c259ef71f6e1ec4fe806e3 || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <11f83253244060b5de5eac787f61ae3f3e559d01 || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <fa9861e5c8af7651dddfa8d490aaada17ae33b6c || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <6ff2ebfef75fbc57d937d8fbe738b967edf2d331 || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <1eeedb310229bfee9dd4d992e5bba33fe1378a8f || >=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <2a14e91b6d76639dac70ea170f4384c1ee3cb48d | 93e01e837e105299f1c259ef71f6e1ec4fe806e3, 11f83253244060b5de5eac787f61ae3f3e559d01, fa9861e5c8af7651dddfa8d490aaada17ae33b6c, 6ff2ebfef75fbc57d937d8fbe738b967edf2d331, 1eeedb310229bfee9dd4d992e5bba33fe1378a8f, 2a14e91b6d76639dac70ea170f4384c1ee3cb48d |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
In the Linux kernel, the following vulnerability has been resolved: mctp i2c: initialise event handler read bytes Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads will return "val" from the i2c bus driver. For i2c-aspeed and i2c-npcm7xx that is a stack uninitialised u8. Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c instance, now it returns all 0xff.
Quoted source text, attributed separately from HOL analysis.