netfs: Fix read abandonment during retry
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.18.21, 6.19.11
- 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: netfs: Fix read abandonment during retry Under certain circumstances, all the remaining subrequests from a read request will get abandoned during retry. The abandonment process expects the 'subreq' variable to be set to the place to start abandonment from, but it doesn't always have a useful value (it will be uninitialised on the first pass through the loop and it may point to a deleted subrequest on later passes). Fix the first jump to "abandon:" to set subreq to the start of the first subrequest expected to need retry (which, in this abandonment case, turned out unexpectedly to no longer have NEED_RETRY set). Also clear the subreq pointer after discarding superfluous retryable subrequests to cause an oops if we do try to access it.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From ee4cdf7ba857a894ad1650d6ab77669cbbfa329e · fixed in 3e5fd8f53b575ff2188f82071da19c977ca56c41; From ee4cdf7ba857a894ad1650d6ab77669cbbfa329e · fixed in 8f2f2bd128a8d9edbc1e785760da54ada3df69b7; From ee4cdf7ba857a894ad1650d6ab77669cbbfa329e · fixed in 7e57523490cd2efb52b1ea97f2e0a74c0fb634cd
- Linux Linux
6.12
- KernelLinux
From 6.12.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11