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NVD / CVE Program· CNA Linux

CVE-2026-89724: media: vicodec: fix out-of-bounds write in FWHT encoder

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 6ea647e76c44387d5c1c635df4604c2154d9060e, 84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7, 8c14472431e27f13661d0db9d837156eaced0ecb.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 6ea647e76c44387d5c1c635df4604c2154d9060e, 84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7, 8c14472431e27f13661d0db9d837156eaced0ecb 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: media: vicodec: fix out-of-bounds write in FWHT encoder vidioc_s_fmt_vid_out() sizes the encoder CAPTURE buffer from the compressed descriptor pixfmt_fwht, whose sizeimage_mult is 3: coded_w * coded_h * 3 + sizeof(struct fwht_cframe_hdr). fwht_encode_frame() encodes one plane per component, and an incompressible plane takes the FWHT_FRAME_UNENCODED path in encode_plane(), copying the plane verbatim. For a 4-component pixel format all four planes are full resolution (width_div == height_div == 1), so a frame that forces every plane through the unencoded fallback writes sizeof(struct fwht_cframe_hdr) + 4 * coded_w * coded_h bytes, overrunning the plane by coded_w * coded_h, which can result in corruption of adjacent kernel heap memory. Bump pixfmt_fwht.sizeimage_mult from 3 to 4, matching the largest components_num among the supported raw formats, so the capture buffer is always large enough for the unencoded fallback.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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

    • 5.0affected
    • 16ecf6dff97ce0194a7126e26159492668d47a7e and later · before f7ae26c100a6c26c2a166d2c41e73188067b36bdaffected · git
    • 16ecf6dff97ce0194a7126e26159492668d47a7e and later · before 6ea647e76c44387d5c1c635df4604c2154d9060eaffected · git
    • 16ecf6dff97ce0194a7126e26159492668d47a7e and later · before d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fffaffected · git
    • 16ecf6dff97ce0194a7126e26159492668d47a7e and later · before e21cccc29b840930cd9dcfdf1139658063a681afaffected · git
    • 16ecf6dff97ce0194a7126e26159492668d47a7e and later · before 84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7affected · git
    • 16ecf6dff97ce0194a7126e26159492668d47a7e and later · before 8c14472431e27f13661d0db9d837156eaced0ecbaffected · git
    • 16ecf6dff97ce0194a7126e26159492668d47a7e and later · before b95315ffc66b39856396c1043618bb4e4d5785baaffected · git
    • 16ecf6dff97ce0194a7126e26159492668d47a7e and later · before cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9affected · git
    • before 5.0not 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

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-2026-89722Sep 11, 2026 · PCI/sysfs: Fix out-of-bounds read in pci_write_legacy_io()
    0Monitor
  • ← EarlierCVE-2026-89723Sep 11, 2026 · nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation
    31Monitor
  • Later →CVE-2026-89725Sep 11, 2026 · media: cec: stm32: prevent out-of-bounds write on RX overflow
    35Monitor

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 Linux6ea647e76c44387d5c1c635df4604c2154d9060eVendor (CNA)
Linux Linux84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7Vendor (CNA)
Linux Linux8c14472431e27f13661d0db9d837156eaced0ecbVendor (CNA)
Linux Linuxb95315ffc66b39856396c1043618bb4e4d5785baVendor (CNA)
Linux Linuxcf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9Vendor (CNA)
Linux Linuxd40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fffVendor (CNA)
Linux Linuxe21cccc29b840930cd9dcfdf1139658063a681afVendor (CNA)
Linux Linuxf7ae26c100a6c26c2a166d2c41e73188067b36bdVendor (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)

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).

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records