Name | CVE-2021-41073 |
Description | loop_rw_iter in fs/io_uring.c in the Linux kernel 5.10 through 5.14.6 allows local users to gain privileges by using IORING_OP_PROVIDE_BUFFERS to trigger a free of a kernel buffer, as demonstrated by using /proc/<pid>/maps for exploitation. |
Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more) |
References | DSA-4978-1 |
The table below lists information on source packages.
Source Package | Release | Version | Status |
---|---|---|---|
linux (PTS) | buster | 4.19.249-2 | fixed |
buster (security) | 4.19.269-1 | fixed | |
bullseye | 5.10.158-2 | fixed | |
bullseye (security) | 5.10.162-1 | fixed | |
bookworm | 6.1.15-1 | fixed | |
sid | 6.1.20-1 | fixed |
The information below is based on the following data on fixed versions.
Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
---|---|---|---|---|---|---|
linux | source | stretch | (not affected) | |||
linux | source | buster | (not affected) | |||
linux | source | bullseye | 5.10.46-5 | DSA-4978-1 | ||
linux | source | (unstable) | 5.14.6-2 |
[buster] - linux <not-affected> (Vulnerable code introduced later)
[stretch] - linux <not-affected> (Vulnerable code introduced later)
https://www.openwall.com/lists/oss-security/2021/09/18/2
https://www.graplsecurity.com/post/iou-ring-exploiting-the-linux-kernel
https://starlabs.sg/blog/2022/06/io_uring-new-code-new-bugs-and-a-new-exploit-technique/