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NVD / CVE Program· CNA Linux

CVE-2026-90262: btrfs: retry verity reads for not-uptodate Merkle folios

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 12b6d1a1715cbced2e445ca353f9c9987b8636e2, 81241f734f0f662378f5ffc53882b012923e6fe5, 8cc569696dac51fc62bb39b3b8f530582b916d29.

Low priority for now. Upgrade to Linux Linux 12b6d1a1715cbced2e445ca353f9c9987b8636e2, 81241f734f0f662378f5ffc53882b012923e6fe5, 8cc569696dac51fc62bb39b3b8f530582b916d29 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: btrfs: retry verity reads for not-uptodate Merkle folios btrfs_read_merkle_tree_page() can find a folio in the mapping that is not uptodate. After taking the folio lock, the current code treats that state as a read error and returns -EIO. That can make a previous transient read failure sticky. If the failed read left a not-uptodate folio in the mapping, later callers find that folio and fail instead of retrying the read. Keep the existing page-cache insertion and locking order, but retry the Merkle item read when a not-uptodate folio is found in the mapping. Also unlock the folio when read_key_bytes() fails so that a later caller can lock it and retry the read.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 9th 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?

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

    • 6.6affected
    • 06ed09351b67eb1114ae106a87a0ee3ea9adb3db and later · before 90e9eae1b5907fa36620ffb7f4f1a4afa9333427affected · git
    • 06ed09351b67eb1114ae106a87a0ee3ea9adb3db and later · before c1fa005cdf3b7ff14cdfd7d512830088a3fc256baffected · git
    • 06ed09351b67eb1114ae106a87a0ee3ea9adb3db and later · before 12b6d1a1715cbced2e445ca353f9c9987b8636e2affected · git
    • 06ed09351b67eb1114ae106a87a0ee3ea9adb3db and later · before 81241f734f0f662378f5ffc53882b012923e6fe5affected · git
    • 06ed09351b67eb1114ae106a87a0ee3ea9adb3db and later · before 8cc569696dac51fc62bb39b3b8f530582b916d29affected · git
    • before 6.6not affected · semver
    • 6.6.157 and later · up to and including 6.6.*not affected · semver
    • 6.12.110 and later · up to and including 6.12.*not affected · semver
    • 6.18.52 and later · up to and including 6.18.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1
openSUSE:Tumbleweedkernel-sourcebefore 7.2.8-1.17.2.8-1.1

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-2026-90260Sep 17, 2026 · btrfs: zoned: don't clobber the extent buffer when zeroing it out
    28Monitor
  • ← EarlierCVE-2026-90261Sep 17, 2026 · btrfs: zoned: flush active metadata block group at btree_writepages() start
    0Monitor
  • Later →CVE-2026-90263Sep 17, 2026 · btrfs: check if root is readonly when setting posix acl
    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 Linux12b6d1a1715cbced2e445ca353f9c9987b8636e2Vendor (CNA)
Linux Linux81241f734f0f662378f5ffc53882b012923e6fe5Vendor (CNA)
Linux Linux8cc569696dac51fc62bb39b3b8f530582b916d29Vendor (CNA)
Linux Linux90e9eae1b5907fa36620ffb7f4f1a4afa9333427Vendor (CNA)
Linux Linuxc1fa005cdf3b7ff14cdfd7d512830088a3fc256bVendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.2.8-1.1 · openSUSE:TumbleweedPackage 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.

—

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 (4 more)

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

All records