Answer in brief
CVE-2026-74689 records a Unknown severity 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.
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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b3bcd5d65ac03c15787b2a5b36c718e26a689336 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35f258fee9ed358c6d0f57f91c30bf029c3724af || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6eb6af88710977eb529b558a07294874d8c40c4d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9f77c1ab382188f5b51982fab6d913443b6dc59f || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2c5988c7349c0b64a7e0441bfc6e1dca54f7116a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3 | b3bcd5d65ac03c15787b2a5b36c718e26a689336, 35f258fee9ed358c6d0f57f91c30bf029c3724af, 6eb6af88710977eb529b558a07294874d8c40c4d, 9f77c1ab382188f5b51982fab6d913443b6dc59f, 2c5988c7349c0b64a7e0441bfc6e1dca54f7116a, d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 22, 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.