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NVD / CVE Program· CNA Linux

CVE-2026-80644: ocfs2: don't BUG_ON an invalid journal dinode

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 12c32a7350b670aaaaf2e01583d8648ec0c9755c, 3852478d34c7baa490ba9c7374ee901a56eea577, 5b33f99f3e48465bd93219495381a5aef4fa967f.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 12c32a7350b670aaaaf2e01583d8648ec0c9755c, 3852478d34c7baa490ba9c7374ee901a56eea577, 5b33f99f3e48465bd93219495381a5aef4fa967f or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ocfs2: don't BUG_ON an invalid journal dinode [BUG] A fuzzed OCFS2 image can corrupt the current slot journal dinode while mount is still in progress. The mount path first reports the invalid journal block and then crashes in shutdown: kernel BUG at fs/ocfs2/journal.c:1034! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI RIP: 0010:ocfs2_journal_toggle_dirty+0x2d6/0x340 fs/ocfs2/journal.c:1034 Call Trace: ocfs2_journal_shutdown+0x414/0xc30 fs/ocfs2/journal.c:1116 ocfs2_mount_volume fs/ocfs2/super.c:1785 [inline] ocfs2_fill_super+0x30a9/0x3cd0 fs/ocfs2/super.c:1083 get_tree_bdev_flags+0x38b/0x640 fs/super.c:1698 get_tree_bdev+0x24/0x40 fs/super.c:1721 ocfs2_get_tree+0x21/0x30 fs/ocfs2/super.c:1184 vfs_get_tree+0x9a/0x370 fs/super.c:1758 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3642 [inline] do_new_mount fs/namespace.c:3718 [inline] path_mount+0x5b8/0x1ea0 fs/namespace.c:4028 do_mount fs/namespace.c:4041 [inline] __do_sys_mount fs/namespace.c:4229 [inline] __se_sys_mount fs/namespace.c:4206 [inline] __x64_sys_mount+0x282/0x320 fs/namespace.c:4206 ... [CAUSE] ocfs2_journal_toggle_dirty() used to return -EIO when journal->j_bh no longer contained a valid dinode, because the startup and shutdown paths already handled that failure. Commit 10995aa2451a ("ocfs2: Morph the haphazard OCFS2_IS_VALID_DINODE() checks.") changed the check to a BUG_ON() under the assumption that the journal dinode had already been validated. That turns an unexpected invalid journal dinode during mount teardown into a kernel crash instead of a normal mount failure. [FIX] Replace the BUG_ON() with WARN_ON() and return -EIO. This keeps the invariant warning for debugging, but restores the original behavior of failing startup or shutdown cleanly instead of panicking the kernel.

—No exploit Fix available
Published
Aug 28, 2026
Updated
Aug 28, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

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—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.29affected
    • 10995aa2451afa20b721cc7de856cae1a13dba57 and later · before bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0affected · git
    • 10995aa2451afa20b721cc7de856cae1a13dba57 and later · before 86509c5296fe46ad6bcdd83931a53c2c6b7913a8affected · git
    • 10995aa2451afa20b721cc7de856cae1a13dba57 and later · before 12c32a7350b670aaaaf2e01583d8648ec0c9755caffected · git
    • 10995aa2451afa20b721cc7de856cae1a13dba57 and later · before b460f8d01a12061853d02c8fb693fb42450acd7daffected · git
    • 10995aa2451afa20b721cc7de856cae1a13dba57 and later · before a06eec15596e5801bad59ad16cd2bf4f0fa839a1affected · git
    • 10995aa2451afa20b721cc7de856cae1a13dba57 and later · before 3852478d34c7baa490ba9c7374ee901a56eea577affected · git
    • 10995aa2451afa20b721cc7de856cae1a13dba57 and later · before 5b33f99f3e48465bd93219495381a5aef4fa967faffected · git
    • 10995aa2451afa20b721cc7de856cae1a13dba57 and later · before c0438198c28b1d22c272751af5e717c11d9fa8ddaffected · git
    • before 2.6.29not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80641Aug 28, 2026 · wifi: wlcore: enable the right set of ciphers
    0Monitor
  • ← EarlierCVE-2026-80642Aug 28, 2026 · liveupdate: Reference count incoming FLB data
    0Monitor
  • Later →CVE-2026-80645Aug 28, 2026 · rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux12c32a7350b670aaaaf2e01583d8648ec0c9755cVendor (CNA)
Linux Linux3852478d34c7baa490ba9c7374ee901a56eea577Vendor (CNA)
Linux Linux5b33f99f3e48465bd93219495381a5aef4fa967fVendor (CNA)
Linux Linux86509c5296fe46ad6bcdd83931a53c2c6b7913a8Vendor (CNA)
Linux Linuxa06eec15596e5801bad59ad16cd2bf4f0fa839a1Vendor (CNA)
Linux Linuxb460f8d01a12061853d02c8fb693fb42450acd7dVendor (CNA)
Linux Linuxbf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0Vendor (CNA)
Linux Linuxc0438198c28b1d22c272751af5e717c11d9fa8ddVendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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