s390/vfio_ccw: Limit the number of channel program segments
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.6.153, 6.12.105, 6.18.46, 7.1.10
- 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: total
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary (but not architectural) limit to the number of CCWs that can exist in a single channel program. The vfio-ccw logic breaks these channel programs into segments whenever it encounters a Transfer-In-Channel (TIC) CCW, and the combined number of segments count towards the global limit. Impose an equivalent limit to the number of segments until such logic can be made non-recursive.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in 15fb4559a7fdf0b8725e433a71cfd03a1313a48b; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in a1625f66eaa1200068a0e2c05bc90e65182fc4e3; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in 06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in 4ee94790490ae8dcc97df8597f07836c8a81bbcf; From 0a19e61e6d4c6192077ead760ba0a2d350987d4c · fixed in 5405c90d6a47b3014e74ee0618a162449abbbc93
- Linux Linux
4.12
- KernelLinux
From 4.12.0 · fixed in 6.6.153; From 6.7.0 · fixed in 6.12.105; From 6.13.0 · fixed in 6.18.46; From 6.19.0 · fixed in 7.1.10