CVE-2025-68796f2fs: fix to avoid updating zero-sized extent in extent cache
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 20 days later
· 20 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 6e9619499f53b22ead972e476c0e8341c997d929 – < 9c07bd262c13ca922adad6e7613d48505f97f548
- affected 6e9619499f53b22ead972e476c0e8341c997d929 – < 72c58a82e6fb7b327e8701f5786c70c3edc56188
- affected 6e9619499f53b22ead972e476c0e8341c997d929 – < e50b81c50fcbe63f50405bb40f262162ff32af88
- affected 6e9619499f53b22ead972e476c0e8341c997d929 – < efe3371001f50a2d6f746b50bdc6f9f26b2089ec
- affected 6e9619499f53b22ead972e476c0e8341c997d929 – < 4f244c64efe628d277b916f47071adf480eb8646
- affected 6e9619499f53b22ead972e476c0e8341c997d929 – < bac23833220a1f8fe8dfab7e16efa20ff64d7589
- affected 6e9619499f53b22ead972e476c0e8341c997d929 – < 7c37c79510329cd951a4dedf3f7bf7e2b18dccec
- affected 4.7
- unaffected < 4.7
- unaffected 5.10.248 – ≤ 5.10.*
- unaffected 5.15.198 – ≤ 5.15.*
- unaffected 6.1.160 – ≤ 6.1.*
- unaffected 6.6.120 – ≤ 6.6.*
- unaffected 6.12.64 – ≤ 6.12.*
- unaffected 6.18.3 – ≤ 6.18.*
- unaffected 6.19 – ≤ *
References
References7
- https://git.kernel.org/stable/c/9c07bd262c13ca922adad6e7613d48505f97f548 (opens in a new tab)
- https://git.kernel.org/stable/c/72c58a82e6fb7b327e8701f5786c70c3edc56188 (opens in a new tab)
- https://git.kernel.org/stable/c/e50b81c50fcbe63f50405bb40f262162ff32af88 (opens in a new tab)
- https://git.kernel.org/stable/c/efe3371001f50a2d6f746b50bdc6f9f26b2089ec (opens in a new tab)
- https://git.kernel.org/stable/c/4f244c64efe628d277b916f47071adf480eb8646 (opens in a new tab)
- https://git.kernel.org/stable/c/bac23833220a1f8fe8dfab7e16efa20ff64d7589 (opens in a new tab)
- https://git.kernel.org/stable/c/7c37c79510329cd951a4dedf3f7bf7e2b18dccec (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-2284 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-68796)Record last updated .