CVE-2021-20317

NameCVE-2021-20317
DescriptionA flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user privileges to cause a denial of service, slowing and eventually stopping the system while running OSP.
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-2843-1, ELA-535-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie, jessie (lts)3.16.84-1vulnerable
stretch4.9.228-1vulnerable
stretch (security)4.9.290-1fixed
buster4.19.208-1vulnerable
buster (security)4.19.194-3vulnerable
bullseye5.10.84-1fixed
bullseye (security)5.10.92-1fixed
sid, bookworm5.15.15-1fixed
linux-4.9 (PTS)jessie, jessie (lts)4.9.290-1~deb8u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcejessie(unfixed)end-of-life
linuxsourcestretch4.9.290-1DLA-2843-1
linuxsource(unstable)5.4.6-1
linux-4.9sourcejessie4.9.290-1~deb8u1ELA-535-1

Notes

https://git.kernel.org/linus/511885d7061eda3eb1faf3f57dcc936ff75863f1 (5.4-rc1)

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