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CVE Record

CVE-2025-68771: ocfs2: fix kernel BUG in ocfs2_find_victim_chain

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue affects OCFS2, a clustered filesystem. A corrupted or inconsistent allocation chain state can trigger a kernel BUG and panic the machine. The practical business concern is availability: systems using OCFS2 could crash instead of logging a filesystem error.

Executive priority

Treat as a targeted availability risk. Patch OCFS2-dependent systems ahead of routine cycles, especially clustered storage or production hosts where a kernel panic would cause downtime.

Technical view

ocfs2_find_victim_chain() could hit BUG_ON(!cl->cl_next_free_rec) when cl_next_free_rec is 0. The fix adds validation in ocfs2_claim_suballoc_bits() for zero or out-of-range cl_next_free_rec and routes the condition through ocfs2_error() rather than panicking.

Likely exposure

Exposure appears limited to Linux systems using OCFS2 or handling OCFS2 filesystems. The source lists multiple Linux kernel lines as affected, but does not provide CPEs, CVSS, or distribution-specific package status.

Exploitation context

The source says syzbot reported the kernel BUG. It does not state active exploitation, public exploit availability, remote reachability, or attacker prerequisites. KEV status is false in the provided bundle.

Researcher notes

The key behavioral change is replacing a BUG-triggered panic path with explicit allocation-chain validation and ocfs2_error(). Evidence is incomplete for exploitability, trigger source, and distribution impact, so avoid broad Linux-wide claims.

Mitigation direction

  • Prioritize kernel updates for systems using OCFS2.
  • Apply vendor or stable-kernel updates containing the referenced fixes.
  • Check distribution advisories for exact package versions.
  • Disable or avoid OCFS2 where it is not operationally required.

Validation and detection

  • Inventory hosts with OCFS2 mounted or enabled.
  • Compare running kernel versions against vendor fixed releases.
  • Review kernel logs for OCFS2 panic or ocfs2_find_victim_chain traces.
  • Confirm updated kernels include the referenced stable commits.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
8Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

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  3. CVE updatedCVE Program

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxccd979bdbce9fba8412beb3f1de68a9d0171b12c, ccd979bdbce9fba8412beb3f1de68a9d0171b12c, ccd979bdbce9fba8412beb3f1de68a9d0171b12c, ccd979bdbce9fba8412beb3f1de68a9d0171b12c, ccd979bdbce9fba8412beb3f1de68a9d0171b12c, ccd979bdbce9fba8412beb3f1de68a9d0171b12c, ccd979bdbce9fba8412beb3f1de68a9d0171b12cunaffected
LinuxLinux2.6.16, 0, 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.3, 6.19affected
Weakness

CWE details

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