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CVE-2026-80809· NVD / CVE Program· CNA Linux

ocfs2: fix missing metadata reservation for large xattrs

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: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 04ba24bce61c917b5b3009f0db470cbb72e26a0d, 0cdc7dde00ec63ac714271fa8b2918d630b8da1a, 2.6.35.

Low priority for now. Upgrade to Linux Linux 04ba24bce61c917b5b3009f0db470cbb72e26a0d, 0cdc7dde00ec63ac714271fa8b2918d630b8da1a, 2.6.35 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: fix missing metadata reservation for large xattrs [BUG] lsetxattr() panics the kernel when setting a large xattr value on a fragmented filesystem where the file already has an external xattr block. [CAUSE] ocfs2_calc_xattr_set_need() never reserves metadata blocks for a new xattr value's extent tree when the file already has an external xattr block. The not_found path leaves meta_add at zero, so meta_ac is NULL when ocfs2_xattr_extend_allocation() runs. A new value root has room for a single extent record. On a fragmented filesystem, the allocator cannot satisfy the xattr value in one contiguous run, so each non-contiguous run requires its own extent record. When the value root's extent list is full and meta_ac is NULL, ocfs2_add_clusters_in_btree() returns RESTART_META, and ocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META). [FIX] The case where no xattr block exists yet already calls ocfs2_extend_meta_needed(&def_xv.xv.xr_list) to reserve value tree metadata. Add the same reservation to the case where an xattr block already exists, making the two cases consistent. Replace the BUG_ON with a -ENOSPC return so that if RESTART_META is returned despite the reservation, the error propagates to userspace instead of panicking the kernel.

—No exploit Fix available
Published
Sep 4, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 8th 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 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

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

    • 92f61d8a31e270f9391e7bcc0ac638bd4262a8e0, 2.6.35affected
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before 743ac908282ac97ef6e73ac3a92df2cc8ecb7479affected · git
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before 04ba24bce61c917b5b3009f0db470cbb72e26a0daffected · git
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before b4663405ae29d36011cd712d243456f3f9ab700daffected · git
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before 6a009f1e61b11d9e23d3c5aa1dacfb010945da45affected · git
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ecaffected · git
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before 6176313622e34fa3e2b66b9d0682d1e1c6b365c5affected · git
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before a3ccb57086dd7652d5ecb826486144198a98a8e9affected · git
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before 50f0cbec45b0f3fd7e1263d01916518dbf31eb3faffected · git
    • a78f9f4668949a6588b8872f162e86685c63d023 and later · before 0cdc7dde00ec63ac714271fa8b2918d630b8da1aaffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.107-16.12.107-1
Debian:14linuxbefore 7.1.12-17.1.12-1

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
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  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80807Sep 4, 2026 · nilfs2: reject invalid block index in GC ioctl
    0Monitor
  • ← EarlierCVE-2026-80808Sep 4, 2026 · ext4: stop retrying saturated xattr cache entries
    0Monitor
  • Later →CVE-2026-80810Sep 4, 2026 · io_uring/rsrc: fix folio size overflow in io_vec_fill_bvec()
    0Monitor

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 Linux04ba24bce61c917b5b3009f0db470cbb72e26a0dVendor (CNA)
Linux Linux0cdc7dde00ec63ac714271fa8b2918d630b8da1aVendor (CNA)
Linux Linux2.6.35Vendor (CNA)
Linux Linux50f0cbec45b0f3fd7e1263d01916518dbf31eb3fVendor (CNA)
Linux Linux6176313622e34fa3e2b66b9d0682d1e1c6b365c5Vendor (CNA)
Linux Linux6a009f1e61b11d9e23d3c5aa1dacfb010945da45Vendor (CNA)
Linux Linux743ac908282ac97ef6e73ac3a92df2cc8ecb7479Vendor (CNA)
Linux Linuxa3ccb57086dd7652d5ecb826486144198a98a8e9Vendor (CNA)
Linux Linuxb4663405ae29d36011cd712d243456f3f9ab700dVendor (CNA)
Linux Linuxb9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ecVendor (CNA)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · 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

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

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.

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Bug bounty scope

No known public program.

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

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 (8 more)

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

All records