CVE-2022-50567
Published Oct 22, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: fs: jfs: fix shift-out-of-bounds in dbAllocAG Syzbot found a crash : UBSAN: shift-out-of-bounds in dbAllocAG. The underlying bug is the missing check of bmp->db_agl2size. The field can be greater than 64 and trigger the shift-out-of-bounds. Fix this bug by adding a check of bmp->db_agl2size in dbMount since this field is used in many following functions. The upper bound for this field is L2MAXL2SIZE - L2MAXAG, thanks for the help of Dave Kleikamp. Note that, for maintenance, I reorganized error handling code of dbMount.
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References
Other References
https://git.kernel.org/stable/c/0536f76a2bca83d1a3740517ba22cc93a44b3099
https://git.kernel.org/stable/c/2c575c8905f7a8b32d5611b91856b69bac2a5bf1
https://git.kernel.org/stable/c/3115313cf03113e87c87adee18ee49a20bbdb9ba
https://git.kernel.org/stable/c/359616ce587e524107730504891afa4b1a8be58c
https://git.kernel.org/stable/c/3e997e4ce8ae7ab89d72334120f6aee49c5bbdbd
https://git.kernel.org/stable/c/67973caae78e21ee46a7281aaa8ca364eb9c444f
https://git.kernel.org/stable/c/898f706695682b9954f280d95e49fa86ffa55d08
https://git.kernel.org/stable/c/d3b486946a4e62c7ef6023f7d9c1d049051384ba
https://git.kernel.org/stable/c/eea87acb6027be3dd4d3c57186bb22800d57fdda
Frequently Asked Questions
What is CVE-2022-50567? +
In the Linux kernel, the following vulnerability has been resolved:
fs: jfs: fix shift-out-of-bounds in dbAllocAG
Syzbot found a crash : UBSAN: shift-out-of-bounds in dbAllocAG. The
underlying bug is the missing check of bmp->db_agl2size. The field can
be greater than 64 and trigger the shift-out-of-bounds.
Fix this bug by adding a check of bmp->db_agl2size in dbMount since this
field is used in many following functions. The upper bound for this
field is L2MAXL2SIZE - L2MAXAG, thanks for the help of Dave Kleikamp.
Note that, for maintenance, I reorganized error handling code of dbMount.
How do I check if I'm vulnerable to CVE-2022-50567? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.