Answer in brief
CVE-2026-74689 records a High severity (CVSS 7.1) vulnerability in net/atm: fix slab-out-of-bounds read in vcc_setsockopt(). 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 | 2.6.12 | Not reported |
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b3bcd5d65ac03c15787b2a5b36c718e26a689336 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35f258fee9ed358c6d0f57f91c30bf029c3724af || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6eb6af88710977eb529b558a07294874d8c40c4d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9f77c1ab382188f5b51982fab6d913443b6dc59f || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2c5988c7349c0b64a7e0441bfc6e1dca54f7116a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3 | b3bcd5d65ac03c15787b2a5b36c718e26a689336, 35f258fee9ed358c6d0f57f91c30bf029c3724af, 6eb6af88710977eb529b558a07294874d8c40c4d, 9f77c1ab382188f5b51982fab6d913443b6dc59f, 2c5988c7349c0b64a7e0441bfc6e1dca54f7116a, d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3 |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
In the Linux kernel, the following vulnerability has been resolved: net/atm: fix slab-out-of-bounds read in vcc_setsockopt() vcc_setsockopt() contained an ineffective optlen check: if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) return -EINVAL; If __SO_LEVEL_MATCH(optname, level) evaluated to false (e.g. if the caller passed a mismatched level), the length check optlen != __SO_SIZE(optname) was short-circuited and bypassed. Execution then fell through to switch(optname), calling copy_from_sockptr() assuming optval contained sufficient space. Furthermore, even if level matched, a cgroup BPF setsockopt filter could shrink optlen after entry. Because copy_from_sockptr() on kernel pointers uses memcpy(), this leads to a KASAN slab-out-of-bounds read when optlen is smaller than the expected structure size. Fix this by using copy_safe_from_sockptr(), which unconditionally validates that optlen is at least the expected size before copying. Also change the local 'value' variable type from 'unsigned long' to 'int' so that SO_SETCLP matches its sizeof(int) ABI encoding on 64-bit systems.
Quoted source text, attributed separately from HOL analysis.