Description
In the Linux kernel, the following vulnerability has been resolved:
erofs: handle NONHEAD !delta[1] lclusters gracefully
syzbot reported a WARNING in iomap_iter_done: iomap_fiemap+0x73b/0x9b0 fs/iomap/fiemap.c:80 ioctl_fiemap fs/ioctl.c:220 [inline]
Generally, NONHEAD lclusters won't have delta[1]==0, except for crafted images and filesystems created by pre-1.0 mkfs versions.
Previously, it would immediately bail out if delta[1]==0, which led to inadequate decompressed lengths (thus FIEMAP is impacted). Treat it as delta[1]=1 to work around these legacy mkfs versions.
`lclusterbits > 14` is illegal for compact indexes, error out too.
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HAffected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= d95ae5e25326092d61613acf98280270dde22778, < 75a0a6dde803e7a3af700da8da9a361b49f69eba; >= d95ae5e25326092d61613acf98280270dde22778, < f466641debcbea8bdf78d1b63a6270aadf9301bf; >= d95ae5e25326092d61613acf98280270dde22778, < 480c6c7b55aeacac800bc2a0d321ff53273045e5; >= d95ae5e25326092d61613acf98280270dde22778, < daaf68fef4b2ff97928227630021d37b27a96655; >= d95ae5e25326092d61613acf98280270dde22778, < 0bc8061ffc733a0a246b8689b2d32a3e9204f43c; 96a85becb811ca2ce21a21721f1544d342ae431e; 8c723eef989bc419585237daa467b787ddca5415; >= 5.4.251, < 5.5; >= 5.10.188, < 5.11 |
| Linux | Linux | 5.15 |
References
- https://git.kernel.org/stable/c/0bc8061ffc733a0a246b8689b2d32a3e9204f43cPatch
- https://git.kernel.org/stable/c/480c6c7b55aeacac800bc2a0d321ff53273045e5Patch
- https://git.kernel.org/stable/c/75a0a6dde803e7a3af700da8da9a361b49f69ebaPatch
- https://git.kernel.org/stable/c/daaf68fef4b2ff97928227630021d37b27a96655Patch
- https://git.kernel.org/stable/c/f466641debcbea8bdf78d1b63a6270aadf9301bfPatch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
Timeline
- Published
- Dec 27, 2024
- Last modified
- Jun 17, 2026
- NVD status
- Modified