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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.16% probability · 6th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.