CVE-2025-68771— ocfs2: fix kernel BUG in ocfs2_find_victim_chain
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I. Basic Information for CVE-2025-68771
Vulnerability Information
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Vulnerability Title
ocfs2: fix kernel BUG in ocfs2_find_victim_chain
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix kernel BUG in ocfs2_find_victim_chain syzbot reported a kernel BUG in ocfs2_find_victim_chain() because the `cl_next_free_rec` field of the allocation chain list (next free slot in the chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec) condition in ocfs2_find_victim_chain() and panicking the kernel. To fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(), just before calling ocfs2_find_victim_chain(), the code block in it being executed when either of the following conditions is true: 1. `cl_next_free_rec` is equal to 0, indicating that there are no free chains in the allocation chain list 2. `cl_next_free_rec` is greater than `cl_count` (the total number of chains in the allocation chain list) Either of them being true is indicative of the fact that there are no chains left for usage. This is addressed using ocfs2_error(), which prints the error log for debugging purposes, rather than panicking the kernel.
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ocfs2_find_victim_chain()中cl_next_free_rec字段为0或大于cl_count，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-2025-68771
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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
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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-2025-68771
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