CVE-2019-19241

NameCVE-2019-19241
DescriptionIn the Linux kernel before 5.4.2, the io_uring feature leads to requests that inadvertently have UID 0 and full capabilities, aka CID-181e448d8709. This is related to fs/io-wq.c, fs/io_uring.c, and net/socket.c. For example, an attacker can bypass intended restrictions on adding an IPv4 address to the loopback interface. This occurs because IORING_OP_SENDMSG operations, although requested in the context of an unprivileged user, are sometimes performed by a kernel worker thread without considering that context.
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)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1fixed
jessie (security)3.16.81-1fixed
stretch4.9.210-1fixed
stretch (security)4.9.189-3+deb9u2fixed
buster4.19.98-1fixed
buster (security)4.19.67-2+deb10u2fixed
bullseye5.4.19-1fixed
sid5.5.13-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)5.3.15-1
linuxsourcebuster(not affected)
linuxsourcejessie(not affected)
linuxsourcestretch(not affected)

Notes

[buster] - linux <not-affected> (Vulnerable code introduced later)
[stretch] - linux <not-affected> (Vulnerable code introduced later)
[jessie] - linux <not-affected> (Vulnerable code introduced later)
https://bugs.chromium.org/p/project-zero/issues/detail?id=1975
https://git.kernel.org/linus/181e448d8709e517c9c7b523fcd209f24eb38ca7
https://git.kernel.org/linus/d69e07793f891524c6bbf1e75b9ae69db4450953

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