md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.18.14, 6.19.4
- 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: md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout When llbitmap_suspend_timeout() times out waiting for percpu_ref to become zero, it returns -ETIMEDOUT without resurrecting the percpu_ref. The caller (md_llbitmap_daemon_fn) then continues to the next page without calling llbitmap_resume(), leaving the percpu_ref in a killed state permanently. Fix this by resurrecting the percpu_ref before returning the error, ensuring the page control structure remains usable for subsequent operations.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 5ab829f1971dc99f2aac10846c378e67fc875abc · fixed in 095417d6b669c2dec39a5842ccb94df915f97f54; From 5ab829f1971dc99f2aac10846c378e67fc875abc · fixed in 2446d099350185caeed19ab2c0270451a97296fb; From 5ab829f1971dc99f2aac10846c378e67fc875abc · fixed in d119bd2e1643cc023210ff3c6f0657e4f914e71d
- Linux Linux
6.18
- KernelLinux
From 6.18.0 · fixed in 6.18.14; From 6.19.0 · fixed in 6.19.4