Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.5 Sideband Reply Parsers drm/dp/mst out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k2.63

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.5 and classified as critical. This affects the function drm_dp_sideband_parse_enum_path_resources_ack/drm_dp_sideband_parse_allocate_payload_ack/drm_dp_sideband_parse_query_payload_ack of the file drm/dp/mst of the component Sideband Reply Parsers. Executing a manipulation of the argument avail_payload_bw_number/full_payload_bw_number/allocated_pbn can lead to out-of-bounds. The identification of this vulnerability is CVE-2026-68277. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.5. It has been declared as critical. This vulnerability affects the function drm_dp_sideband_parse_enum_path_resources_ack/drm_dp_sideband_parse_allocate_payload_ack/drm_dp_sideband_parse_query_payload_ack of the file drm/dp/mst of the component Sideband Reply Parsers. The manipulation of the argument avail_payload_bw_number/full_payload_bw_number/allocated_pbn with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers Three sideband reply parsers read 16-bit fields as: val = (raw->msg[idx] << 8) | (raw->msg[idx+1]); and check bounds only after the fact. When idx == raw->curlen, raw->msg[idx+1] reads one byte past the received message data into the following struct fields (curchunk_len, curchunk_idx, curlen). Affected functions: - drm_dp_sideband_parse_enum_path_resources_ack() full_payload_bw_number and avail_payload_bw_number fields - drm_dp_sideband_parse_allocate_payload_ack() allocated_pbn field - drm_dp_sideband_parse_query_payload_ack() allocated_pbn field Fix by using a single combined check (idx + 2 > curlen) before each 2-byte read. Since the check is strictly tighter than idx > curlen, no separate step is needed. [added fixes tag]

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-68277 since 07/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/10/2026).

Upgrading to version 6.6.148, 6.12.101, 6.18.42, 7.1.6 or 7.2-rc1 eliminates this vulnerability. Applying the patch bdf0508b1e6785d4a8982c637e97e68d60b47d7b/0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df/d5c70523cafa26ad2c7a37b612849abe2683baa8/68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73/6b89ba3dba2f583626fb693e47e951ffb8bf591f is able to eliminate this problem.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.148/6.12.101/6.18.42/7.1.6/7.2-rc1
Patch: bdf0508b1e6785d4a8982c637e97e68d60b47d7b/0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df/d5c70523cafa26ad2c7a37b612849abe2683baa8/68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73/6b89ba3dba2f583626fb693e47e951ffb8bf591f

Timelineinfo

07/30/2026 CVE reserved
08/10/2026 +11 days Advisory disclosed
08/10/2026 +0 days VulDB entry created
08/10/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-68277 (🔒)
GCVE (CVE): GCVE-0-2026-68277
GCVE (VulDB): GCVE-100-387664

Entryinfo

Created: 08/10/2026 17:20
Changes: 08/10/2026 17:20 (61)
Complete: 🔍
Cache ID: 216::103

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