CVE-2026-43305

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 5.5 from GitHub Security Advisory published 2026-05-08. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path

[Why] The evaluation for whether we need to use the DMUB HW lock isn't the same as whether we need to unlock which results in a hang when the fast path is used for ASIC without FAMS support.

[How] Store a flag that indicates whether we should use the lock and use that same flag to specify whether unlocking is needed.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity55% × 45%
The EG Score, 5.5 of 10.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 8, 2026

Last Modified

May 15, 2026

Advisory Details (2)

Auto-updated Jun 17, 2026
Patch available.
Web page

drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/af3303970da5ce5bfe6dffdd07f38f42aad603e0
Web page

drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4e387ad67efb100b645630ffbce7716786f52283

Vendor Advisories for CVE-2026-43305(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
linuxKernel @ 6.19.6 (fixes >=6.19.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 25× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 184 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 85 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-12 16:06 UTCEG score recompute
  3. 2026-10-11 19:48 UTCEG score recompute
  4. 2026-10-11 17:02 UTCEG score recompute
  5. 2026-10-11 14:28 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  9. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  11. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  15. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-09-30 08:28 UTCOSV refresh
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-09-23 17:53 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  20. 2026-09-20 20:15 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  21. 2026-09-18 19:28 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  22. 2026-09-17 19:31 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  23. 2026-09-16 14:08 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  24. 2026-09-16 05:15 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  25. 2026-09-13 16:47 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
Show 74 more
  1. 2026-09-11 14:53 UTCOSV refresh
  2. 2026-09-11 14:53 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  3. 2026-09-11 09:37 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  4. 2026-09-10 09:34 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  5. 2026-09-04 05:06 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  6. 2026-09-02 14:12 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  7. 2026-08-30 19:17 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  8. 2026-08-30 01:22 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  9. 2026-08-26 14:46 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  10. 2026-08-25 13:49 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  11. 2026-08-23 19:17 UTCEG score recompute
  12. 2026-08-23 19:17 UTCVendor advisory
  13. 2026-08-23 19:17 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  14. 2026-08-23 00:19 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  15. 2026-08-17 13:47 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  16. 2026-08-17 11:57 UTCEG score recompute
  17. 2026-08-17 11:57 UTCVendor advisory
  18. 2026-08-17 11:56 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  19. 2026-08-16 14:56 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  20. 2026-08-16 04:38 UTCVendor advisory
  21. 2026-08-16 04:38 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  22. 2026-08-14 03:13 UTCVendor advisory
  23. 2026-08-14 03:13 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  24. 2026-08-12 16:49 UTCEG score recompute
  25. 2026-08-12 16:49 UTCVendor advisory
  26. 2026-08-12 16:49 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  27. 2026-08-12 13:51 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  28. 2026-08-11 10:59 UTCVendor advisory
  29. 2026-08-11 10:59 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  30. 2026-08-10 08:39 UTCVendor advisory
  31. 2026-08-10 08:39 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  32. 2026-08-09 06:21 UTCEG score recompute
  33. 2026-08-09 06:21 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  34. 2026-08-08 16:37 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  35. 2026-08-08 04:03 UTCEG score recompute
  36. 2026-08-08 04:03 UTCVendor advisory
  37. 2026-08-08 04:03 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  38. 2026-08-07 01:45 UTCEG score recompute
  39. 2026-08-07 01:45 UTCVendor advisory
  40. 2026-08-07 01:45 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  41. 2026-08-06 13:46 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  42. 2026-08-05 22:10 UTCEG score recompute
  43. 2026-08-05 22:10 UTCVendor advisory
  44. 2026-08-05 22:10 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  45. 2026-08-05 19:17 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  46. 2026-08-04 15:10 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  47. 2026-08-04 10:38 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  48. 2026-08-03 19:33 UTCEG score recompute
  49. 2026-08-03 19:33 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  50. 2026-08-03 10:36 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  51. 2026-08-02 03:11 UTCEG score recompute
  52. 2026-08-02 03:11 UTCVendor advisory
  53. 2026-08-02 03:11 UTCGHSA enrichmentGHSA-99gr-cw2x-89qp · GitHub CVSS 5.5
  54. 2026-08-02 02:27 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  55. 2026-08-01 04:16 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  56. 2026-07-30 16:28 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  57. 2026-07-28 15:36 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  58. 2026-07-27 14:13 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  59. 2026-07-26 14:54 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  60. 2026-07-25 14:18 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  61. 2026-07-24 14:17 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  62. 2026-07-23 14:18 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  63. 2026-07-23 03:14 UTCEG score recompute
  64. 2026-07-22 14:08 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  65. 2026-07-21 15:24 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  66. 2026-07-20 17:08 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  67. 2026-07-18 10:04 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  68. 2026-07-16 17:03 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  69. 2026-07-16 05:49 UTCOSV refresh
  70. 2026-07-15 02:00 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  71. 2026-07-13 22:30 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  72. 2026-07-12 05:46 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  73. 2026-07-11 08:27 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  74. 2026-07-09 19:10 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile

Frequently asked(5)

What is CVE-2026-43305?
CVE-2026-43305 is a medium-severity vulnerability; its CVE record was published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path [Why] The evaluation for whether we need to use the DMUB HW lock isn't the same as whether we need to unlock which results in a hang when the fast path is…
When was the CVE record for CVE-2026-43305 published?
The CVE record for CVE-2026-43305 was published on May 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of May 15, 2026; the record at its source may have been updated since.
Is CVE-2026-43305 actively exploited?
CVE-2026-43305 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43305?
CVE-2026-43305 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-43305?
A fix for CVE-2026-43305 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-43305 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-43305

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