CVE-2026-68277: Linux kernel · drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in d5c70523cafa26ad2c7a37b612849abe2683baa8 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:04 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in d5c70523cafa26ad2c7a37b612849abe2683baa8, c1f72a13d54ffd16647d3fa540d961f5deba8790, bdf0508b1e6785d4a8982c637e97e68d60b47d7b +5
Exploitation evidence
Disclosed: evidence found.
CVE published 10 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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]
References
- git.kernel.org/stable/c/c1f72a13d54ffd16647d3fa540d961f5deba8790 (opens in a new tab)
- git.kernel.org/stable/c/192e146c2d57ad033b0d418ec64ee390f8dc074e (opens in a new tab)
- git.kernel.org/stable/c/6e3107e6522109a07fc9bb0fc4ec463f1982e113 (opens in a new tab)
- git.kernel.org/stable/c/bdf0508b1e6785d4a8982c637e97e68d60b47d7b (opens in a new tab)
- git.kernel.org/stable/c/0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df (opens in a new tab)
- git.kernel.org/stable/c/d5c70523cafa26ad2c7a37b612849abe2683baa8 (opens in a new tab)
- git.kernel.org/stable/c/68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73 (opens in a new tab)
- git.kernel.org/stable/c/6b89ba3dba2f583626fb693e47e951ffb8bf591f (opens in a new tab)