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NVD / CVE Program· CNA Linux

CVE-2026-89525: udf: reject VAT indexes equal to the entry count

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: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4, 1bd7947f1463c21edafa256d0fbec5b99215e2b6, 8a8c1c42a34349a0626d910abbad5a29136446b7.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4, 1bd7947f1463c21edafa256d0fbec5b99215e2b6, 8a8c1c42a34349a0626d910abbad5a29136446b7 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: udf: reject VAT indexes equal to the entry count UDF 1.50 virtual partition mapping uses the VAT as an array of physical block mappings. s_num_entries stores the number of entries in that array, not the highest valid index. The valid VAT indexes are therefore below s_num_entries. udf_get_pblock_virt15() currently rejects only indexes greater than s_num_entries. A crafted image can request index s_num_entries, pass the bounds check, and make the kernel read one entry past the allocated VAT table. Change the check to reject block >= s_num_entries, so the count is handled as an exclusive upper bound. A crafted UDF image reproduced this on origin/master commit 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 with a KASAN slab-out-of-bounds report in udf_get_pblock_virt15(). Trail of Bits has a reproducer that triggers kernel panic demonstrating the bug, and can share it if needed.

—No exploit Fix available
Published
Sep 11, 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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f64e01a90326bb85a3cc8aa0199931dc2f15b589affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8a8c1c42a34349a0626d910abbad5a29136446b7affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before b77b83f5529a26d084d64ece98abd6f0cc86e053affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9193368408d792cec2057628d87862140fb1ce1caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before b95c33a4e743874f1b0a45bf2aaa4da553552bd1affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 1bd7947f1463c21edafa256d0fbec5b99215e2b6affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before cac0cb07f29ccfb373fd4a36c81e908ef3ce608caffected · git
    • before 2.6.12not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
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-2026-89523Sep 11, 2026 · wifi: mt76: mt7925: cancel pending mlo_pm_work
    31Monitor
  • ← EarlierCVE-2026-89524Sep 11, 2026 · wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets
    32Monitor
  • Later →CVE-2026-89526Sep 11, 2026 · svcrdma: Validate Read chunk positions before reconstruction
    39Monitor

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 Linux19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4Vendor (CNA)
Linux Linux1bd7947f1463c21edafa256d0fbec5b99215e2b6Vendor (CNA)
Linux Linux8a8c1c42a34349a0626d910abbad5a29136446b7Vendor (CNA)
Linux Linux9193368408d792cec2057628d87862140fb1ce1cVendor (CNA)
Linux Linuxb77b83f5529a26d084d64ece98abd6f0cc86e053Vendor (CNA)
Linux Linuxb95c33a4e743874f1b0a45bf2aaa4da553552bd1Vendor (CNA)
Linux Linuxcac0cb07f29ccfb373fd4a36c81e908ef3ce608cVendor (CNA)
Linux Linuxf64e01a90326bb85a3cc8aa0199931dc2f15b589Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
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).

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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