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NVD / CVE Program· CNA Linux

CVE-2026-31767: drm/i915/dsi: Don't do DSC horizontal timing adjustments in command mode

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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 33b5336e4fd8ba0e40a12989cadb3f5534a0f9e4, 481f7a463ae4bea9503ae7fa1481ad75dc872af4, 4dfce79e098915d8e5fc2b9e1d980bc3251dd32c; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 33b5336e4fd8ba0e40a12989cadb3f5534a0f9e4, 481f7a463ae4bea9503ae7fa1481ad75dc872af4, 4dfce79e098915d8e5fc2b9e1d980bc3251dd32c; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes 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: drm/i915/dsi: Don't do DSC horizontal timing adjustments in command mode Stop adjusting the horizontal timing values based on the compression ratio in command mode. Bspec seems to be telling us to do this only in video mode, and this is also how the Windows driver does things. This should also fix a div-by-zero on some machines because the adjusted htotal ends up being so small that we end up with line_time_us==0 when trying to determine the vtotal value in command mode. Note that this doesn't actually make the display on the Huawei Matebook E work, but at least the kernel no longer explodes when the driver loads. (cherry picked from commit 0b475e91ecc2313207196c6d7fd5c53e1a878525)

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-31767

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.6 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

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

    • 5.6affected
    • 53693f02d80e0a909e76c2a25f8aac8515f959db and later · before 80cc84bdc49addaee6b6e4f735f574ab5a424c42affected · git
    • 53693f02d80e0a909e76c2a25f8aac8515f959db and later · before 481f7a463ae4bea9503ae7fa1481ad75dc872af4affected · git
    • 53693f02d80e0a909e76c2a25f8aac8515f959db and later · before 55efe8402f46af8399c8b634a18b130a05fd7820affected · git
    • 53693f02d80e0a909e76c2a25f8aac8515f959db and later · before 86e926b108880c0109b8635e459450447156aeb7affected · git
    • 53693f02d80e0a909e76c2a25f8aac8515f959db and later · before 33b5336e4fd8ba0e40a12989cadb3f5534a0f9e4affected · git
    • 53693f02d80e0a909e76c2a25f8aac8515f959db and later · before 4dfce79e098915d8e5fc2b9e1d980bc3251dd32caffected · git
    • before 5.6not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.160 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-31761May 1, 2026 · iio: gyro: mpu3050: Move iio_device_register() to correct location
    31Monitor
  • ← EarlierCVE-2026-31765May 1, 2026 · drm/amdgpu: Change AMDGPU_VA_RESERVED_TRAP_SIZE to 64KB
    22Monitor
  • Later →CVE-2026-31768May 1, 2026 · iio: adc: ti-adc161s626: use DMA-safe memory for spi_read()
    31Monitor

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 Linux33b5336e4fd8ba0e40a12989cadb3f5534a0f9e4Vendor (CNA)
Linux Linux481f7a463ae4bea9503ae7fa1481ad75dc872af4Vendor (CNA)
Linux Linux4dfce79e098915d8e5fc2b9e1d980bc3251dd32cVendor (CNA)
Linux Linux55efe8402f46af8399c8b634a18b130a05fd7820Vendor (CNA)
Linux Linux80cc84bdc49addaee6b6e4f735f574ab5a424c42Vendor (CNA)
Linux Linux86e926b108880c0109b8635e459450447156aeb7Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.85-1 · Debian:13Package 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.

No history yet (it accumulates with the daily EPSS job).

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.

  • CVE-2026-317700 days aparthwmon: (occ) Fix division by zero in occ_show_power_1()
    22Monitor
  • CVE-2026-431825 days apartmedia: ccs: Avoid possible division by zero
    22Monitor
  • CVE-2026-432385 days apartnet/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()
    22Monitor
  • CVE-2026-432675 days apartwifi: rtw89: fix potential zero beacon interval in beacon tracking
    22Monitor
  • CVE-2026-316057 days apartfbdev: udlfb: avoid divide-by-zero on FBIOPUT_VSCREENINFO
    22Monitor
  • CVE-2026-316187 days apartfbdev: tdfxfb: avoid divide-by-zero on FBIOPUT_VSCREENINFO
    22Monitor

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

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

Weakness class (CWE)

CWE-369 · Divide By Zero

CVSS vector

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

nvd-primary

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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records