CVE-2026-98872

freevxfs: don't BUG() on unknown typed-extent type

State: Published
Severity: Not scored
Published: Oct 23, 2026
Updated: Oct 26, 2026
Reserved: Sep 25, 2026

Description

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

freevxfs: don't BUG() on unknown typed-extent type

vxfs_bmap_typed() handles four typed-extent types and calls BUG() in its default case, so an on-disk typed extent with any other type value crashes the kernel. It is reachable from ioctl(FIBMAP) on a regular file:

kernel BUG at fs/freevxfs/vxfs_bmap.c:230! RIP: vxfs_bmap_typed fs/freevxfs/vxfs_bmap.c:230 [inline] vxfs_bmap1+0x128a/0x12d0 fs/freevxfs/vxfs_bmap.c:257

Replace the BUG() with WARN_ON_ONCE() and return 0 -- the value vxfs_bmap_typed() already returns on failure (and from the DEV4 case above); vxfs_getblk() maps 0 to -EIO, so the ioctl fails cleanly.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before fe40a19d571cbb584eea46038ee919d8712b2d2cAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 500e9d5bf9eff2096a21b7ac25a0a06ca46ab821Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before f1f2d54a576f0e4133b979e545abcfefd439c300Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7ada9807e37103b41f586d34e3075e1209182b65Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 1284d687d46953fff9c0d969df108114611aca8bAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 405f13d7b270913e06e8e2b4de568985f94ef7d6Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 704d48d81dc41470e108811c32c577ada66192d4Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before fe40a19d571cbb584eea46038ee919d8712b2d2cAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 500e9d5bf9eff2096a21b7ac25a0a06ca46ab821Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before f1f2d54a576f0e4133b979e545abcfefd439c300Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7ada9807e37103b41f586d34e3075e1209182b65Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 1284d687d46953fff9c0d969df108114611aca8bAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 405f13d7b270913e06e8e2b4de568985f94ef7d6Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 704d48d81dc41470e108811c32c577ada66192d4Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2 and laterNot affected

References

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