CVE-2026-74689
CVE CVE-2026-74689EUVD EUVD-2026-64376Published 2026-08-22T15:32:54.000ZLast changed 2026-08-25T05:41:33.000ZCVSS 7.1
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 0; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2c5988c7349c0b64a7e0441bfc6e1dca54f7116a; patch: 7.1.9; patch: 6.6.152; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35f258fee9ed358c6d0f57f91c30bf029c3724af; patch: 6.18.45; patch: 7.2; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6eb6af88710977eb529b558a07294874d8c40c4d; patch: 6.1.183; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9f77c1ab382188f5b51982fab6d913443b6dc59f; patch: 6.12.104; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b3bcd5d65ac03c15787b2a5b36c718e26a689336; 2.6.12
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.