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NVD / CVE Program· CNA Linux

CVE-2026-68278: drm/dp/mst: fix buffer overflows in sideband chunk accumulation

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Fixed version: Linux Linux 1e5827839ad0ceb0079d1560c321fa3656b54f21, 4d5109075a787de28c9e89940f9dee45269f91fa, 53937a2787d29c7a460e984dc4f20ff6ac91dc65; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1e5827839ad0ceb0079d1560c321fa3656b54f21, 4d5109075a787de28c9e89940f9dee45269f91fa, 53937a2787d29c7a460e984dc4f20ff6ac91dc65; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix buffer overflows in sideband chunk accumulation drm_dp_sideband_append_payload() has three related bugs when processing device-provided sideband reply data: 1. Zero-length curchunk_len underflow: msg_len is a 6-bit field taken directly from the DP sideband header. If a device sends msg_len=0, curchunk_len is set to zero. The condition (curchunk_idx >= curchunk_len) is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow). drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy() writes 255 bytes into msg[], both far out of bounds. 2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks until curchunk_idx reaches curchunk_len, writing up to 15 bytes past the end of chunk[] into msg[]. 3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256], so the memcpy can spill into adjacent struct fields. All three are reachable from any DP MST device that can forge sideband reply messages on a physical connection.

—No exploit Fix available
Published
Aug 10, 2026
Updated
Aug 23, 2026
EPSS
0.2% · 14th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.17affected
    • ad7f8a1f9ced7f049f9b66d588723f243a7034cd and later · before ef2ecb6cf268debf3890df99fea01b6452dcf78eaffected · git
    • ad7f8a1f9ced7f049f9b66d588723f243a7034cd and later · before d4e05dedb252ed3e540a0c9be511e427f098110aaffected · git
    • ad7f8a1f9ced7f049f9b66d588723f243a7034cd and later · before 4d5109075a787de28c9e89940f9dee45269f91faaffected · git
    • ad7f8a1f9ced7f049f9b66d588723f243a7034cd and later · before 53937a2787d29c7a460e984dc4f20ff6ac91dc65affected · git
    • ad7f8a1f9ced7f049f9b66d588723f243a7034cd and later · before ef0dbcc200c3389f1f781ab181932a97e54b51afaffected · git
    • ad7f8a1f9ced7f049f9b66d588723f243a7034cd and later · before 1e5827839ad0ceb0079d1560c321fa3656b54f21affected · git
    • ad7f8a1f9ced7f049f9b66d588723f243a7034cd and later · before a6366b551079c79bf7bdbadd74c97358bcfe2d58affected · git
    • ad7f8a1f9ced7f049f9b66d588723f243a7034cd and later · before 55bd5e685bda455b9b50c835f8c8442d52a344a3affected · git
    • before 3.17not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.68.1.el10_26.12.0-211.68.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68276Aug 10, 2026 · drm/amdgpu/gfx: fix cleaner shader IB buffer overflow
    0Monitor
  • ← EarlierCVE-2026-68277Aug 10, 2026 · drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers
    0Monitor
  • Later →CVE-2026-68279Aug 10, 2026 · drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1e5827839ad0ceb0079d1560c321fa3656b54f21Vendor (CNA)
Linux Linux4d5109075a787de28c9e89940f9dee45269f91faVendor (CNA)
Linux Linux53937a2787d29c7a460e984dc4f20ff6ac91dc65Vendor (CNA)
Linux Linux55bd5e685bda455b9b50c835f8c8442d52a344a3Vendor (CNA)
Linux Linuxa6366b551079c79bf7bdbadd74c97358bcfe2d58Vendor (CNA)
Linux Linuxd4e05dedb252ed3e540a0c9be511e427f098110aVendor (CNA)
Linux Linuxef0dbcc200c3389f1f781ab181932a97e54b51afVendor (CNA)
Linux Linuxef2ecb6cf268debf3890df99fea01b6452dcf78eVendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.173.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.173.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-modules5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-modules-core5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-modules-extra5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-abi-stablelists5.14.0-687.57.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-rt4.18.0-553.173.1.rt7.514.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.173.1.rt7.514.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.173.1.rt7.514.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.173.1.rt7.514.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.173.1.rt7.514.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.173.1.rt7.514.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.173.1.rt7.514.el8_10 · AlmaLinux:8Package registry (OSV)

+19

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records