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NVD / CVE Program· CNA Linux

CVE-2026-64546: drm/edid: fix OOB read in drm_parse_tiled_block()

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.13% (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 157727131ce8a52d8d9bc676c372ef82db6436c4, 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb, 4f5484d25f85ad6c989bad5f6a43450cecfcfd28; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 157727131ce8a52d8d9bc676c372ef82db6436c4, 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb, 4f5484d25f85ad6c989bad5f6a43450cecfcfd28; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1 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/edid: fix OOB read in drm_parse_tiled_block() drm_parse_tiled_block() casts the DisplayID block to a struct displayid_tiled_block and reads the full fixed layout up to tile->topology_id[7] without checking block->num_bytes. The DisplayID iterator only validates the declared payload length, so a crafted EDID can advertise a tiled-display block (tag DATA_BLOCK_TILED_DISPLAY, or DATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY for v2.0) with a small num_bytes at the end of a DisplayID extension. The read then runs past the end of the exact-sized kmemdup()'d EDID allocation, a heap out-of-bounds read. Reject blocks shorter than the spec's 22-byte tiled payload before reading the fixed struct, as drm_parse_vesa_mso_data() already does. BUG: KASAN: slab-out-of-bounds in drm_edid_connector_update Read of size 2 at addr ffff888010077700 by task exploit/147 dump_stack_lvl (lib/dump_stack.c:94 ...) print_report (mm/kasan/report.c:378 ...) kasan_report (mm/kasan/report.c:595) drm_edid_connector_update (drivers/gpu/drm/drm_edid.c:7581) bochs_connector_helper_get_modes (drivers/gpu/drm/tiny/bochs.c:574) drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:426) status_store (drivers/gpu/drm/drm_sysfs.c:219) ... vfs_write (fs/read_write.c:595 fs/read_write.c:688) ksys_write (fs/read_write.c:740)

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Jul 27, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 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.

CNA vs NVD score

NVD
—
CNA · Linux
7.1
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.

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

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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.

—

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

    • 3.19affected
    • 40d9b043a89e2301e1f97ade055a73ecc28e9afe and later · before c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0affected · git
    • 40d9b043a89e2301e1f97ade055a73ecc28e9afe and later · before 9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061affected · git
    • 40d9b043a89e2301e1f97ade055a73ecc28e9afe and later · before 157727131ce8a52d8d9bc676c372ef82db6436c4affected · git
    • 40d9b043a89e2301e1f97ade055a73ecc28e9afe and later · before bfa05d89dc3ca3fb1a9099ef5185549a5ec8490daffected · git
    • 40d9b043a89e2301e1f97ade055a73ecc28e9afe and later · before 4f5484d25f85ad6c989bad5f6a43450cecfcfd28affected · git
    • 40d9b043a89e2301e1f97ade055a73ecc28e9afe and later · before 9cc0f8e63e8c34cf43def35cbd305ba711181a1faffected · git
    • 40d9b043a89e2301e1f97ade055a73ecc28e9afe and later · before 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fbaffected · git
    • 40d9b043a89e2301e1f97ade055a73ecc28e9afe and later · before faaa1e1155833e7d4ce7e3cfaf64c0d636b190dbaffected · git
    • before 3.19not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:12linux-6.12before 6.12.100-1~deb12u16.12.100-1~deb12u1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

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-2026-64544Jul 27, 2026 · crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents
    0Monitor
  • ← EarlierCVE-2026-64545Jul 27, 2026 · net, bpf: check master for NULL in xdp_master_redirect()
    30Monitor
  • Later →CVE-2026-64547Jul 27, 2026 · net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
    32Monitor

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 Linux157727131ce8a52d8d9bc676c372ef82db6436c4Vendor (CNA)
Linux Linux4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fbVendor (CNA)
Linux Linux4f5484d25f85ad6c989bad5f6a43450cecfcfd28Vendor (CNA)
Linux Linux9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061Vendor (CNA)
Linux Linux9cc0f8e63e8c34cf43def35cbd305ba711181a1fVendor (CNA)
Linux Linuxbfa05d89dc3ca3fb1a9099ef5185549a5ec8490dVendor (CNA)
Linux Linuxc4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0Vendor (CNA)
Linux Linuxfaaa1e1155833e7d4ce7e3cfaf64c0d636b190dbVendor (CNA)
azl3 kernel 6.6.144.1-1 on Azure Linux 3.06.6.145.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~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.

  • CVE-2026-6808212 days apartlibceph: fix two unsafe bare decodes in decode_lockers()
    39Monitor
  • CVE-2026-6816014 days apartceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
    39Monitor
  • CVE-2026-6838814 days apartsmb/client: handle overlapping allocated ranges in fallocate
    39Monitor
  • CVE-2026-7208419 days apartscsi: target: Bound PR-OUT TransportID parsing to the received buffer
    39Monitor
  • CVE-2026-645510 days apartsctp: validate STALE_COOKIE cause length before reading staleness
    36Monitor
  • CVE-2026-6834314 days apartsmb: client: validate DFS referral PathConsumed
    36Monitor

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

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
none
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
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. 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