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🛡️ CVE-2025-68796 — kernel

⚪ Unknown ✅ No Known Exploit NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

f2fs: fix to avoid updating zero-sized extent in extent cache

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

f2fs: fix to avoid updating zero-sized extent in extent cache

As syzbot reported:

F2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0, extent [0, 0, 0], age [0, 0]

------------[ cut here ]------------

kernel BUG at fs/f2fs/extent_cache.c:678!

Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI

CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014

RIP: 0010:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678

Call Trace:

<TASK>

f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085

f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]

f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737

f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030

vfs_fallocate+0x669/0x7e0 fs/open.c:342

ioctl_preallocate fs/ioctl.c:289 [inline]

file_ioctl+0x611/0x780 fs/ioctl.c:-1

do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576

__do_sys_ioctl fs/ioctl.c:595 [inline]

__se_sys_ioctl+0x82/0x170 fs/ioctl.c:583

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

RIP: 0033:0x7f07bc58eec9

In error path of f2fs_zero_range(), it may add a zero-sized extent

into extent cache, it should be avoided.

Affected software

CVE-2025-68796 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 6.18.3)
  • unknown

Timeline and source

Published on 13 January 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-68796 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-01-13
Updated 2026-08-20
Modified 2026-08-12
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel 6.13.0 6.18.3
unknown — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.