CVE-2025-68796— f2fs: fix to avoid updating zero-sized extent in extent cache
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I. Basic Information for CVE-2025-68796
Vulnerability Information
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Vulnerability Title
f2fs: fix to avoid updating zero-sized extent in extent cache
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于f2fs更新零大小范围到extent cache，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-68796
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Same Patch Batch · Linux · 2026-01-13 · 93 CVEs total
| CVE-2025-71089 | 7.8 HIGH | iommu: disable SVA when CONFIG_X86 is set |
| CVE-2025-71069 | f2fs: invalidate dentry cache on failed whiteout creation | |
| CVE-2025-71068 | svcrdma: bound check rq_pages index in inline path | |
| CVE-2025-71065 | f2fs: fix to avoid potential deadlock | |
| CVE-2025-68821 | fuse: fix readahead reclaim deadlock | |
| CVE-2025-68820 | ext4: xattr: fix null pointer deref in ext4_raw_inode() | |
| CVE-2025-68819 | media: dvb-usb: dtv5100: fix out-of-bounds in dtv5100_i2c_msg() | |
| CVE-2025-68818 | scsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path" | |
| CVE-2025-68817 | ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency | |
| CVE-2025-68823 | ublk: fix deadlock when reading partition table | |
| CVE-2025-71067 | ntfs: set dummy blocksize to read boot_block when mounting | |
| CVE-2025-71071 | iommu/mediatek: fix use-after-free on probe deferral | |
| CVE-2025-71070 | ublk: clean up user copy references on ublk server exit | |
| CVE-2025-71072 | shmem: fix recovery on rename failures | |
| CVE-2025-71073 | Input: lkkbd - disable pending work before freeing device | |
| CVE-2025-71074 | functionfs: fix the open/removal races | |
| CVE-2025-71075 | scsi: aic94xx: fix use-after-free in device removal path | |
| CVE-2025-71077 | tpm: Cap the number of PCR banks | |
| CVE-2025-71076 | drm/xe/oa: Limit num_syncs to prevent oversized allocations | |
| CVE-2025-71078 | powerpc/64s/slb: Fix SLB multihit issue during SLB preload |
Showing top 20 of 93 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-68796
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