CVE-2026-80809: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-80809DEBIAN-CVE-2026-80809
Published 04-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-80809 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.7% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
MGASA-2026-0506OPENSUSE-SU-2026:11773-1

Timeline

  1. 04-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.19% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.107-1 | < 7.1.12-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ a78f9f4668949a6588b8872f162e86685c63d023, < 743ac908282ac97ef6e73ac3a92df2cc8ecb7479 | ≥ a78f9f4668949a6588b8872f162e86685c63d023, < 04ba24bce61c917b5b3009f0db470cbb72e26a0d | ≥ a78f9f4668949a6588b8872f162e86685c63d023, < b4663405ae29d36011cd712d243456f3f9ab700d | ≥ a78f9f4668949a6588b8872f162e86685c63d023, < 6a009f1e61b11d9e23d3c5aa1dacfb010945da45 | ≥ a78f9f4668949a6588b8872f162e86685c63d023, < b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec | ≥ a78f9f4668949a6588b8872f162e86685c63d023, < 6176313622e34fa3e2b66b9d0682d1e1c6b365c5 | ≥ a78f9f4668949a6588b8872f162e86685c63d023, < a3ccb57086dd7652d5ecb826486144198a98a8e9 | ≥ a78f9f4668949a6588b8872f162e86685c63d023, < 50f0cbec45b0f3fd7e1263d01916518dbf31eb3f | ≥ a78f9f4668949a6588b8872f162e86685c63d023, < 0cdc7dde00ec63ac714271fa8b2918d630b8da1a | 92f61d8a31e270f9391e7bcc0ac638bd4262a8e0 | ≥ 2.6.34.2, < 2.6.35 | 2.6.35

3 vendors · 172 products

References

13 links
Show all 13 references