CVE-2026-98872
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.
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Affected products
1Patches
Vulnerability mechanics
References
7- git.kernel.org/stable/c/1284d687d46953fff9c0d969df108114611aca8bnvd
- git.kernel.org/stable/c/405f13d7b270913e06e8e2b4de568985f94ef7d6nvd
- git.kernel.org/stable/c/500e9d5bf9eff2096a21b7ac25a0a06ca46ab821nvd
- git.kernel.org/stable/c/704d48d81dc41470e108811c32c577ada66192d4nvd
- git.kernel.org/stable/c/7ada9807e37103b41f586d34e3075e1209182b65nvd
- git.kernel.org/stable/c/f1f2d54a576f0e4133b979e545abcfefd439c300nvd
- git.kernel.org/stable/c/fe40a19d571cbb584eea46038ee919d8712b2d2cnvd
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