CVE-2022-49769

Advisory lineage Upstream: 0 Downstream: 9
Analyzed
Published: 01 May 2025, 14:09
Last modified:11 May 2026, 19:06

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.04% LOW
0% probability +0.02%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

01 May 2025, 14:09
Published
Vulnerability first disclosed
11 May 2026, 19:06
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: Check sb_bsize_shift after reading superblock Fuzzers like to scribble over sb_bsize_shift but in reality it's very unlikely that this field would be corrupted on its own. Nevertheless it should be checked to avoid the possibility of messy mount errors due to bad calculations. It's always a fixed value based on the block size so we can just check that it's the expected value. Tested with: mkfs.gfs2 -O -p lock_nolock /dev/vdb for i in 0 -1 64 65 32 33; do gfs2_edit -p sb field sb_bsize_shift $i /dev/vdb mount /dev/vdb /mnt/test && umount /mnt/test done Before this patch we get a withdraw after [ 76.413681] gfs2: fsid=loop0.0: fatal: invalid metadata block [ 76.413681] bh = 19 (type: exp=5, found=4) [ 76.413681] function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 492 and with UBSAN configured we also get complaints like [ 76.373395] UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:295:19 [ 76.373815] shift exponent 4294967287 is too large for 64-bit type 'long unsigned int' After the patch, these complaints don't appear, mount fails immediately and we get an explanation in dmesg.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.04%• Percentile: 12%

Affected Systems

  • linux•linux

    ≥ b3b94faa5fe5968827ba0640ee9fba4b3e7f736e, < d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87 | ≥ b3b94faa5fe5968827ba0640ee9fba4b3e7f736e, < 1ad197097343568066a8ffaa27ee7d0ae6d9f476 | ≥ b3b94faa5fe5968827ba0640ee9fba4b3e7f736e, < 15c83fa0fd659dd9fbdc940a560b61236e876a80 | ≥ b3b94faa5fe5968827ba0640ee9fba4b3e7f736e, < 8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2 | ≥ b3b94faa5fe5968827ba0640ee9fba4b3e7f736e, < 5fa30be7ba81191b0a0c7239a89befc0c94286d5 | ≥ b3b94faa5fe5968827ba0640ee9fba4b3e7f736e, < 28275a7c84d21c55ab3282d897f284d8d527173c | ≥ b3b94faa5fe5968827ba0640ee9fba4b3e7f736e, < 16670534c7cff1acd918a6a5ec751b14e7436b76 | ≥ b3b94faa5fe5968827ba0640ee9fba4b3e7f736e, < 670f8ce56dd0632dc29a0322e188cc73ce3c6b92 | 2.6.19

  • linux•linux_kernel

    < 4.9.334 | ≥ 4.10, < 4.14.300 | ≥ 4.15, < 4.19.267 | ≥ 4.20, < 5.4.225 | ≥ 5.5, < 5.10.156 | ≥ 5.11, < 5.15.80 | ≥ 5.16, < 6.0.10

References (8)