CVE-2021-26931
Description
An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-26931
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-26931.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 5.10.18.hardened1-1 | |
| sles | affected | | |
| debian | bookworm | fixed | 5.10.19-1 |
| debian | bullseye | fixed | 5.10.19-1 |
| debian | forky | fixed | 5.10.19-1 |
| debian | sid | fixed | 5.10.19-1 |
| debian | trixie | fixed | 5.10.19-1 |
References
Verify integrity in audit chain (admin only). AS-IS.