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CVE-2026-93067· NVD / CVE Program· CNA Linux

drm/bridge: tc358767: clamp the reported AUX read size to the request

In the Linux kernel, the following vulnerability has been resolved: drm/bridge: tc358767: clamp the reported AUX read size to the request tc_aux_transfer() clamps an AUX read to the payload limit: size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size); After the transfer it replaces size with the byte count the controller reports in AUX_BYTES: if (size) size = FIELD_GET(AUX_BYTES, auxstatus); AUX_BYTES is GENMASK(15, 8), so it can be up to 255. Nothing clamps it back to the request. tc_aux_read_data() reads that many bytes into the 16-byte auxrdata stack buffer, then copies them into the caller buffer. A reported count of 255 makes the read run to 256 bytes and overruns both. The controller should never report more than it was asked to transfer, so this is defense in depth rather than a live hole. The reported count is only lightly trusted, and the check is cheap. Clamp it back to the request, the same way ti-sn65dsi86 does in commit aca58eac52b8 ("drm/bridge: ti-sn65dsi86: Never store more than msg->size bytes in AUX xfer").

—No exploit Fix available
Published
Sep 17, 2026
Updated
Sep 17, 2026
EPSS
0.2% · 6th percentile
CWE
—
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Action score

0

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Low priority for now.

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

Affected systems

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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

    • 5.4affected
    • 12dfe7c4d9c53442efcb4113cff505f60d654906 and later · before ebf00c51c9ac9188e2806a2b842418805ee879beaffected · git
    • 12dfe7c4d9c53442efcb4113cff505f60d654906 and later · before 424b762cc26d512e3e7421e57e41b4b55be2400baffected · git
    • 12dfe7c4d9c53442efcb4113cff505f60d654906 and later · before dd6274706bec30d005bff0587a4262d01dc2775aaffected · git
    • 12dfe7c4d9c53442efcb4113cff505f60d654906 and later · before 982caa744fce79d18f2920382aaeb0da821a6e73affected · git
    • 12dfe7c4d9c53442efcb4113cff505f60d654906 and later · before 33c0b072e31dee98a754d9bd01800359dfeb9e8faffected · git
    • 12dfe7c4d9c53442efcb4113cff505f60d654906 and later · before 57c567e0e8aa76f6e3e8f39d7f40c20bc37e76afaffected · git
    • 12dfe7c4d9c53442efcb4113cff505f60d654906 and later · before 9ff718df547372d70ca20ad8e66a3fb1300936b2affected · git
    • 12dfe7c4d9c53442efcb4113cff505f60d654906 and later · before ec6444a00c49e6c2b5e9a507272a28126677f9eeaffected · git
    • before 5.4not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxall versions—
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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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 Linux33c0b072e31dee98a754d9bd01800359dfeb9e8fVendor (CNA)
Linux Linux424b762cc26d512e3e7421e57e41b4b55be2400bVendor (CNA)
Linux Linux57c567e0e8aa76f6e3e8f39d7f40c20bc37e76afVendor (CNA)
Linux Linux982caa744fce79d18f2920382aaeb0da821a6e73Vendor (CNA)
Linux Linux9ff718df547372d70ca20ad8e66a3fb1300936b2Vendor (CNA)
Linux Linuxdd6274706bec30d005bff0587a4262d01dc2775aVendor (CNA)
Linux Linuxebf00c51c9ac9188e2806a2b842418805ee879beVendor (CNA)
Linux Linuxec6444a00c49e6c2b5e9a507272a28126677f9eeVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)

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

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EPSS, last 120 days

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

Patch and commit links

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Credits

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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.

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Bug bounty scope

No known public program.

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

Technical details

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

Weakness class (CWE)

—

Attack context

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Change log

  1. Fix✗ → ✓

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References

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

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