Unknown

CVE-2026-80809 — ocfs2: fix missing metadata reservation for large xattrs

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.

Published Sep 4, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 26, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ a78f9f4668949a6588b8872f162e86685c63d023 and < 743ac908282ac97ef6e73ac3a92df2cc8ecb7479≥ a78f9f4668949a6588b8872f162e86685c63d023 and < 04ba24bce61c917b5b3009f0db470cbb72e26a0d≥ a78f9f4668949a6588b8872f162e86685c63d023 and < b4663405ae29d36011cd712d243456f3f9ab700d≥ a78f9f4668949a6588b8872f162e86685c63d023 and < 6a009f1e61b11d9e23d3c5aa1dacfb010945da45≥ a78f9f4668949a6588b8872f162e86685c63d023 and < b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec≥ a78f9f4668949a6588b8872f162e86685c63d023 and < 6176313622e34fa3e2b66b9d0682d1e1c6b365c5≥ a78f9f4668949a6588b8872f162e86685c63d023 and < a3ccb57086dd7652d5ecb826486144198a98a8e9≥ a78f9f4668949a6588b8872f162e86685c63d023 and < 50f0cbec45b0f3fd7e1263d01916518dbf31eb3f and 4 more ≥ a78f9f4668949a6588b8872f162e86685c63d023 and < 0cdc7dde00ec63ac714271fa8b2918d630b8da1aversion 92f61d8a31e270f9391e7bcc0ac638bd4262a8e0≥ 2.6.34.2 and < 2.6.35version 2.6.35	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 26, 2026 · 11 reading(s) · max 0.20%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 4, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

11 on the record

git.kernel.org/stable/c/b4663405ae29d36011cd712d243456f3f9ab700d
NIST National Vulnerability Database
git.kernel.org/stable/c/50f0cbec45b0f3fd7e1263d01916518dbf31eb3f
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-80809
GitHub Security Advisories
git.kernel.org/stable/c/6a009f1e61b11d9e23d3c5aa1dacfb010945da45
NIST National Vulnerability Database
git.kernel.org/stable/c/6176313622e34fa3e2b66b9d0682d1e1c6b365c5
NIST National Vulnerability Database
git.kernel.org/stable/c/b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec
NIST National Vulnerability Database
git.kernel.org/stable/c/0cdc7dde00ec63ac714271fa8b2918d630b8da1a
NIST National Vulnerability Database
git.kernel.org/stable/c/743ac908282ac97ef6e73ac3a92df2cc8ecb7479
NIST National Vulnerability Database
git.kernel.org/stable/c/04ba24bce61c917b5b3009f0db470cbb72e26a0d
NIST National Vulnerability Database
github.com/advisories/GHSA-4q7v-w8cm-5gq2
GitHub Security Advisories
git.kernel.org/stable/c/a3ccb57086dd7652d5ecb826486144198a98a8e9
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99092 riscv: patch: fix handling of bpf-jit execmem addresses 14h
Unknown CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting 14h
Unknown CVE-2026-99095 drm/vc4: drain the hangcheck timer and works on V3D unbind 14h
Unknown CVE-2026-99096 io_uring/register: don't exempt disabled rings from task restrictions 14h
Unknown CVE-2026-99097 tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper() 14h
Unknown CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size 14h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-80809 is "ocfs2: fix missing metadata reservation for large xattrs", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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