xfrm: prevent policy_hthresh.work from racing with netns teardown
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.12.80, 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: xfrm: prevent policy_hthresh.work from racing with netns teardown A XFRM_MSG_NEWSPDINFO request can queue the per-net work item policy_hthresh.work onto the system workqueue. The queued callback, xfrm_hash_rebuild(), retrieves the enclosing struct net via container_of(). If the net namespace is torn down before that work runs, the associated struct net may already have been freed, and xfrm_hash_rebuild() may then dereference stale memory. xfrm_policy_fini() already flushes policy_hash_work during teardown, but it does not synchronize policy_hthresh.work. Synchronize policy_hthresh.work in xfrm_policy_fini() as well, so the queued work cannot outlive the net namespace teardown and access a freed struct net.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 880a6fab8f6ba5b5abe59ea68533202ddea1012c · fixed in 56ea2257b83ee29a543f158159e3d1abc1e3e4fe; From 880a6fab8f6ba5b5abe59ea68533202ddea1012c · fixed in 8854e9367465d784046362698731c1111e3b39b8; From 880a6fab8f6ba5b5abe59ea68533202ddea1012c · fixed in 4e2e77843fef473ef47e322d52436d8308582a96; From 880a6fab8f6ba5b5abe59ea68533202ddea1012c · fixed in 29fe3a61bcdce398ee3955101c39f89c01a8a77e
- Linux Linux
3.18
- KernelLinux
From 3.18.0 · fixed in 6.12.80; From 6.13.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11