CVE-2021-38300

NameCVE-2021-38300
Descriptionarch/mips/net/bpf_jit.c in the Linux kernel before 5.4.10 can generate undesirable machine code when transforming unprivileged cBPF programs, allowing execution of arbitrary code within the kernel context. This occurs because conditional branches can exceed the 128 KB limit of the MIPS architecture.
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-2941-1, DSA-5096-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)buster4.19.235-1fixed
buster (security)4.19.249-2fixed
bullseye5.10.106-1fixed
bullseye (security)5.10.120-1fixed
bookworm, sid5.18.5-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcebuster4.19.232-1DSA-5096-1
linuxsourcebullseye5.10.70-1
linuxsource(unstable)5.14.6-1
linux-4.19unknownstretch4.19.232-1~deb9u1DLA-2941-1

Notes

[stretch] - linux <ignored> (mips not supported in LTS)
https://www.openwall.com/lists/oss-security/2021/09/15/5
https://lore.kernel.org/bpf/20210915160437.4080-1-piotras@gmail.com/

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