CVE-2022-50567

fs: jfs: fix shift-out-of-bounds in dbAllocAG

State: Published
Severity: 7.8 High
Published: Oct 22, 2025
Updated: Aug 5, 2026
Reserved: Oct 22, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d3b486946a4e62c7ef6023f7d9c1d049051384baAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3115313cf03113e87c87adee18ee49a20bbdb9baAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before eea87acb6027be3dd4d3c57186bb22800d57fddaAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 359616ce587e524107730504891afa4b1a8be58cAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3e997e4ce8ae7ab89d72334120f6aee49c5bbdbdAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0536f76a2bca83d1a3740517ba22cc93a44b3099Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2c575c8905f7a8b32d5611b91856b69bac2a5bf1Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 67973caae78e21ee46a7281aaa8ca364eb9c444fAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 898f706695682b9954f280d95e49fa86ffa55d08Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 4.9.337 through 4.9.Not affected 4.14.303 through 4.14.Not affected 4.19.270 through 4.19.Not affected 5.4.229 through 5.4.Not affected 5.10.163 through 5.10.Not affected 5.15.86 through 5.15.Not affected 6.0.16 through 6.0.Not affected 6.1.2 through 6.1.Not affected 6.2 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d3b486946a4e62c7ef6023f7d9c1d049051384baAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3115313cf03113e87c87adee18ee49a20bbdb9baAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before eea87acb6027be3dd4d3c57186bb22800d57fddaAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 359616ce587e524107730504891afa4b1a8be58cAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3e997e4ce8ae7ab89d72334120f6aee49c5bbdbdAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0536f76a2bca83d1a3740517ba22cc93a44b3099Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2c575c8905f7a8b32d5611b91856b69bac2a5bf1Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 67973caae78e21ee46a7281aaa8ca364eb9c444fAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 898f706695682b9954f280d95e49fa86ffa55d08Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
4.9.337 through 4.9.*Not affected
4.14.303 through 4.14.*Not affected
4.19.270 through 4.19.*Not affected
5.4.229 through 5.4.*Not affected
5.10.163 through 5.10.*Not affected
5.15.86 through 5.15.*Not affected
6.0.16 through 6.0.*Not affected
6.1.2 through 6.1.*Not affected
6.2 and laterNot affected

References

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