CVE-2026-98786drm/amd/display: guard dc_sink dereferences in MST mode validation
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: guard dc_sink dereferences in MST mode validation dm_dp_mst_is_port_support_mode() reads aconnector->dc_sink->dsc_caps... for the DSC branch-throughput check, and get_conv_frl_bw()'s HDMI-PCON FRL-bandwidth path reads aconnector->dc_sink->edid_caps.max_frl_rate, both without a NULL check. dc_sink is cleared asynchronously on MST unplug, and both functions run from paths that the driver's own comments document as racing that teardown: the connector probe worker's ->mode_valid callback and a compositor's atomic check, neither of which holds the MST manager lock that the teardown path uses. The former does have an existing dsc_aux NULL check, but dsc_aux isn't reliably cleared in every path that clears dc_sink, so it doesn't cover this. Fail the port-support check and skip the FRL conversion path when the sink is already gone. (cherry picked from commit 7c3db8da4e039698ae198c870712428644e965c7)
Timeline
ID reserved
By Linux
- 23 days later
· 23 days later
Published
- 23 days later
· 23 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected f04d275d94e164d24516c32437c988a323018f63 – < 0189f725242087679bc9f1bbf77ad086f56a72c8
- affected f04d275d94e164d24516c32437c988a323018f63 – < 5684a6c24c0d7c40ef2c4ccb3e4a64cffe76a791
- affected f04d275d94e164d24516c32437c988a323018f63 – < daa0437fe5e451856aaf8fda602a9fc2105bbd54
- affected f04d275d94e164d24516c32437c988a323018f63 – < 217f64f348c90cba62164e7ff38e0ccf78a5ca09
- affected 6.0
- unaffected < 6.0
- unaffected 6.12.117 – ≤ 6.12.*
- unaffected 6.18.61 – ≤ 6.18.*
- unaffected 7.2.10 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/0189f725242087679bc9f1bbf77ad086f56a72c8 (opens in a new tab)
- https://git.kernel.org/stable/c/5684a6c24c0d7c40ef2c4ccb3e4a64cffe76a791 (opens in a new tab)
- https://git.kernel.org/stable/c/daa0437fe5e451856aaf8fda602a9fc2105bbd54 (opens in a new tab)
- https://git.kernel.org/stable/c/217f64f348c90cba62164e7ff38e0ccf78a5ca09 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-103871 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98786)Record last updated .