CVE-2021-26931

NameCVE-2021-26931
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2586-1, DLA-2610-1
NVD severitylow

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1vulnerable
stretch (security)4.9.272-2fixed
buster4.19.194-1fixed
buster (security)4.19.194-3fixed
bullseye5.10.46-4fixed
bullseye (security)5.10.46-5fixed
bookworm5.14.6-2fixed
sid5.14.6-3fixed
linux-4.19 (PTS)stretch (security)4.19.194-3~deb9u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch4.9.258-1DLA-2586-1
linuxsourcebuster4.19.177-1
linuxsource(unstable)5.10.19-1
linux-4.19sourcestretch4.19.181-1~deb9u1DLA-2610-1

Notes

https://xenbits.xen.org/xsa/advisory-362.html

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