CVE-2024-35791
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region() Do the cache flush of converted pages in svm_register_enc_region() before dropping kvm->lock to fix use-after-free issues where region and/or its array of pages could be freed by a different task, e.g. if userspace has __unregister_enc_region_locked() already queued up for the region. Note, the "obvious" alternative of using local variables doesn't fully resolve the bug, as region->pages is also dynamically allocated. I.e. the region structure itself would be fine, but region->pages could be freed. Flushing multiple pages under kvm->lock is unfortunate, but the entire flow is a rare slow path, and the manual flush is only needed on CPUs that lack coherency for encrypted memory.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| rhel | 9 | fixed | |
| sles | affected | | |
| rocky | 9 | fixed | |
| debian | bookworm | fixed | 6.1.85-1 |
| debian | bullseye | fixed | 5.10.216-1 |
| debian | forky | fixed | 6.7.12-1 |
| debian | sid | fixed | 6.7.12-1 |
| debian | trixie | fixed | 6.7.12-1 |
| almalinux | 9 | fixed | kernel-headers-5.14.0-427.35.1.el9_4.aarch64.rpm |
References
- https://access.redhat.com/errata/RHSA-2024:6567
- https://www.suse.com/security/cve/CVE-2024-35791.html
- https://errata.rockylinux.org/RXSA-2024:6567
- https://errata.rockylinux.org/RLSA-2024:6567
- https://security-tracker.debian.org/tracker/CVE-2024-35791
- https://bugzilla.redhat.com/2265797
- https://bugzilla.redhat.com/2269434
- https://bugzilla.redhat.com/2269436
- https://bugzilla.redhat.com/2273141
- https://bugzilla.redhat.com/2275678
- https://bugzilla.redhat.com/2278206
- https://bugzilla.redhat.com/2281052
- https://bugzilla.redhat.com/2281151
- https://bugzilla.redhat.com/2281727
- https://bugzilla.redhat.com/2281968
- https://bugzilla.redhat.com/2282709
- https://bugzilla.redhat.com/2284271
- https://bugzilla.redhat.com/2284402
- https://bugzilla.redhat.com/2293273
- https://bugzilla.redhat.com/2293276
- https://bugzilla.redhat.com/2293440
- https://bugzilla.redhat.com/2297511
- https://bugzilla.redhat.com/2297520
- https://bugzilla.redhat.com/2300409
- https://bugzilla.redhat.com/2300414
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.