drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers
Summary
| CVE | CVE-2026-68279 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-10 13:20:17 UTC |
| Updated | 2026-08-23 13:16:36 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers drm_dp_sideband_parse_remote_dpcd_read() reads num_bytes from the raw message and then unconditionally does: memcpy(bytes, &raw->msg[idx], num_bytes); without checking that idx + num_bytes <= raw->curlen. raw->msg[] is 256 bytes; if a malicious or misbehaving MST hub sets num_bytes larger than the remaining payload, the memcpy reads past the received data into whatever follows in raw->msg[]. drm_dp_sideband_parse_remote_i2c_read_ack() has the same flaw (noted with a /* TODO check */ comment since the code was introduced). Fix both functions by using a single combined check (idx + num_bytes > curlen) before each memcpy. Since num_bytes is u8, it is always >= 0, so this strictly subsumes the simpler idx > curlen form and no separate step is needed. [added missing fixes tag] |
Risk And Classification
EPSS: 0.001840000 probability, percentile 0.080090000 (date 2026-08-24)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd 185de1d74e658e2edb723ba76fa61903f77d8a68 git | Not specified |
| CNA | Linux | Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd d7b9b1e33b4ed8c48d4db6e6e21c257ebbbb2586 git | Not specified |
| CNA | Linux | Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd c2fbda0fe0163c55ba3820ee6cea0c6b43622eda git | Not specified |
| CNA | Linux | Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd 22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2 git | Not specified |
| CNA | Linux | Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd 04d953f50d61e542e94a5977822cc53735f8c0ce git | Not specified |
| CNA | Linux | Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd 533d9e2bede4aeefdc2a0561d7071cfede95958f git | Not specified |
| CNA | Linux | Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd e6ef5455b06cb4e5d181aabcd723791587c79f12 git | Not specified |
| CNA | Linux | Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd 1a8f537f5a1eeac941f262fe73078d6b08ba83c0 git | Not specified |
| CNA | Linux | Linux | affected 3.17 | Not specified |
| CNA | Linux | Linux | unaffected 3.17 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.266 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.217 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.183 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.101 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.42 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.6 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/185de1d74e658e2edb723ba76fa61903f77d8a68 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1a8f537f5a1eeac941f262fe73078d6b08ba83c0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c2fbda0fe0163c55ba3820ee6cea0c6b43622eda | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d7b9b1e33b4ed8c48d4db6e6e21c257ebbbb2586 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/533d9e2bede4aeefdc2a0561d7071cfede95958f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/04d953f50d61e542e94a5977822cc53735f8c0ce | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e6ef5455b06cb4e5d181aabcd723791587c79f12 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.