CVE-2023-52810 fs/jfs: Add check for negative db_l2nbperpage

2024-05-2115:31:19

Linux

github.com

linux kernel

vulnerability

fs/jfs

l2nbperpage

shift exponent

ubsan

syzbot

negative value

AI Score

6.9

Confidence

Low

EPSS

Percentile

13.0%

SSVC

Exploitation

none

Automatable

Technical Impact

total

JSON

In the Linux kernel, the following vulnerability has been resolved:

fs/jfs: Add check for negative db_l2nbperpage

l2nbperpage is log2(number of blks per page), and the minimum legal
value should be 0, not negative.

In the case of l2nbperpage being negative, an error will occur
when subsequently used as shift exponent.

Syzbot reported this bug:

UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:799:12
shift exponent -16777216 is negative

ADP Affected

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