CVE-2023-3389
Use after free in io_uring in the Linux Kernel
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.4, 5.10.185
- 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
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation. Racing a io_uring cancel poll request with a linked timeout can cause a UAF in a hrtimer. We recommend upgrading past commit ef7dfac51d8ed961b742218f526bd589f3900a59 (4716c73b188566865bdd79c3a6709696a224ac04 for 5.10 stable and 0e388fce7aec40992eadee654193cad345d62663 for 5.15 stable).
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- kernel
From 5.13 · fixed in 6.4; From 5.10.162 · fixed in 5.10.185
References 10
git.kernel.org
- pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-5.15.y&id=0e388fce7aec40992eadee654193cad345d62663
- pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-5.10.y&id=4716c73b188566865bdd79c3a6709696a224ac04
- pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ef7dfac51d8ed961b742218f526bd589f3900a59