CVE-2026-68277: drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers

Received
AliasesUBUNTU-CVE-2026-68277DEBIAN-CVE-2026-68277
Published 10-08-2026Last modified 23-08-2026

Vulnerability summary

CVE-2026-68277 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.6% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.22%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 24 · Related 22
MGASA-2026-0336MGASA-2026-0337OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1SUSE-SU-2026:23528-1

Timeline

  1. 10-08-2026
    PublishedVulnerability first disclosed.
  2. 23-08-2026
    Last modifiedVulnerability information updated.

Description

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]

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.22% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-202.212 | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1119.126 | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.6-1
  • linux-6.12< 6.12.101-1~deb12u1
Linux1 product
  • linux≥ ad7f8a1f9ced7f049f9b66d588723f243a7034cd, < c1f72a13d54ffd16647d3fa540d961f5deba8790 | ≥ ad7f8a1f9ced7f049f9b66d588723f243a7034cd, < 192e146c2d57ad033b0d418ec64ee390f8dc074e | ≥ ad7f8a1f9ced7f049f9b66d588723f243a7034cd, < 6e3107e6522109a07fc9bb0fc4ec463f1982e113 | ≥ ad7f8a1f9ced7f049f9b66d588723f243a7034cd, < bdf0508b1e6785d4a8982c637e97e68d60b47d7b | ≥ ad7f8a1f9ced7f049f9b66d588723f243a7034cd, < 0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df | ≥ ad7f8a1f9ced7f049f9b66d588723f243a7034cd, < d5c70523cafa26ad2c7a37b612849abe2683baa8 | ≥ ad7f8a1f9ced7f049f9b66d588723f243a7034cd, < 68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73 | ≥ ad7f8a1f9ced7f049f9b66d588723f243a7034cd, < 6b89ba3dba2f583626fb693e47e951ffb8bf591f | 3.17

3 vendors · 172 products

References

22 links
Show all 22 references