netfs: Fix uninitialized return value in netfs_unbuffered_write()
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.18.53, 6.20, 7.2.7
- 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
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix uninitialized return value in netfs_unbuffered_write() If preparation of the first subrequest fails, netfs_unbuffered_write() exits its loop before ret is initialized. The empty-iterator check can do the same. For synchronous writes, netfs_unbuffered_write_iter_locked() may then return an unrelated error instead of wreq->error. This is reachable through CIFS if cifs_prepare_write() fails to reopen the file or obtain credits. Initialize ret to 0 so the caller returns wreq->error if no data was written, or the number of bytes already written otherwise. Found with Clang's -Wconditional-uninitialized.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 72d08d2839649d1c5efbe375751f4473fa4486af · fixed in 3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26; From a0b4c7a49137ed21279f354eb59f49ddae8dffc2 · fixed in 2e38d500471d097cda87d7d374bbc1b13493075d; From a0b4c7a49137ed21279f354eb59f49ddae8dffc2 · fixed in f18e8774f4d3137fa0a5fb8ffa83d59a719666d8; From 6.18.17 · fixed in 6.18.53; From 6.19.7 · fixed in 6.20
- Linux Linux
7.0
- KernelLinux
fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7