VulnerabilityPublished 27 Jul 2026Updated 30 Jul 2026

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

Source GCVE Database

Authoritative record:CVE-2026-64546· High 7.1

Not known to be exploited · CVSS 7.1 High · fixed in faaa1e1155833e7d4ce7e3cfaf64c0d636b190db : patch Linux kernel soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

7.1High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in faaa1e1155833e7d4ce7e3cfaf64c0d636b190db, c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0, bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d +5

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

Attack Vector: Local
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-7h2w-78jh-69gr

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 40d9b043a89e2301e1f97ade055a73ecc28e9afe, < faaa1e1155833e7d4ce7e3cfaf64c0d636b190db	Fixed in faaa1e1155833e7d4ce7e3cfaf64c0d636b190db
LinuxLinux	Affected ≥ 40d9b043a89e2301e1f97ade055a73ecc28e9afe, < c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0	Fixed in c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0
LinuxLinux	Affected ≥ 40d9b043a89e2301e1f97ade055a73ecc28e9afe, < bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d	Fixed in bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d
LinuxLinux	Affected ≥ 40d9b043a89e2301e1f97ade055a73ecc28e9afe, < 157727131ce8a52d8d9bc676c372ef82db6436c4	Fixed in 157727131ce8a52d8d9bc676c372ef82db6436c4
LinuxLinux	Affected ≥ 40d9b043a89e2301e1f97ade055a73ecc28e9afe, < 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb	Fixed in 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb
LinuxLinux	Affected ≥ 40d9b043a89e2301e1f97ade055a73ecc28e9afe, < 9cc0f8e63e8c34cf43def35cbd305ba711181a1f	Fixed in 9cc0f8e63e8c34cf43def35cbd305ba711181a1f

AI-suggested

A fix has been implemented in the Linux kernel to reject improperly sized tiled-display blocks before processing, preventing the out-of-bounds read. Users and administrators should apply the official Linux kernel updates that include this fix once available.

Description

A heap out-of-bounds read vulnerability was resolved in the Linux kernel's drm/edid component. The issue occurs in drm_parse_tiled_block() when it reads beyond the allocated memory due to insufficient validation of the DisplayID block length. This can lead to a kernel slab-out-of-bounds read, potentially causing denial of service or information disclosure.

Impact

This vulnerability allows a local attacker with write access to the EDID data to trigger a heap out-of-bounds read in kernel memory, which can lead to denial of service due to kernel memory corruption or potentially leak sensitive information. The CVSS vector indicates low attack complexity and privileges required, no user interaction, and high confidentiality and availability impact.

Summary

The vulnerability in the Linux kernel's drm/edid subsystem involves drm_parse_tiled_block() casting a DisplayID block to a fixed layout struct and reading up to tile->topology_id[7] without verifying the block's num_bytes field. A crafted EDID can specify a tiled-display block with a smaller num_bytes than expected, causing the function to read past the allocated memory buffer, resulting in a heap out-of-bounds read. The fix involves rejecting blocks shorter than the specification's 22-byte tiled payload before reading the fixed struct, aligning with existing validation in drm_parse_vesa_mso_data().

References

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