net/atm: fix slab-out-of-bounds read in vcc_setsockopt()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in b3bcd5d65ac03c15787b2a5b36c718e26a689336; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 35f258fee9ed358c6d0f57f91c30bf029c3724af; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 6eb6af88710977eb529b558a07294874d8c40c4d; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 9f77c1ab382188f5b51982fab6d913443b6dc59f; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 2c5988c7349c0b64a7e0441bfc6e1dca54f7116a; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3
- Linux Linux
2.6.12
- KernelLinux
From 2.6.12 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.152; From 6.7.0 · fixed in 6.12.104; From 6.13.0 · fixed in 6.18.45; From 6.19.0 · fixed in 7.1.9