CVE-2026-53294

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-26. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

mailbox: mailbox-test: don't free the reused channel

The RX channel can be aliased to the TX channel if it has a different MMIO. This special case needs to be handled when freeing the channels otherwise a double-free occurs.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 26, 2026

Last Modified

July 8, 2026

Advisory Details (8)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

mailbox: mailbox-test: don't free the reused channel - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc0089f82c3e36060c2c79156bc2018bfb16b56b
generic

mailbox: mailbox-test: don't free the reused channel - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c494a11da45ad7ec9b0ff216c3e3ace351193bb6
generic

mailbox: mailbox-test: don't free the reused channel - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/88ebadbf0deefdaccdab868b44ff70a0a257f473
generic

mailbox: mailbox-test: don't free the reused channel - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/82f6dcea46cf5de65c4ba7283f7c7b34de4a324d
generic

mailbox: mailbox-test: don't free the reused channel - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d4f3d0f64f1016cb78b400a70b67df91fac99b5
generic

mailbox: mailbox-test: don't free the reused channel - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5c209299b0113e289e238fa5f2e8f00c59f76060
generic

mailbox: mailbox-test: don't free the reused channel - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3afca89fae501dbd7421e1777b5b8f033b1d98d0
generic

mailbox: mailbox-test: don't free the reused channel - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/240c71a2aea36a1a4210f911a1c32ea88777e8e4

Vendor Advisories for CVE-2026-53294(2)

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

Patch Availability(21)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-07-28ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-07-28ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-07-28ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-07-28ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-07-28ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-07-28ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-07-28ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-07-28ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-07-28ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-07-28ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1009.9) @ resolute2026-07-28ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-07-28ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-07-28ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-07-28ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-07-28ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-07-28ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-07-28ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-07-28ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-07-28ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-07-28ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-07-28ubuntu

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.

All Vendor Advisories

(21)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 17× in last 7d / 72× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-07-28 05:18 UTCVendor advisory
  2. 2026-07-28 05:17 UTCGHSA enrichment
  3. 2026-07-27 17:04 UTCEG score recompute
  4. 2026-07-27 17:04 UTCVendor advisory
  5. 2026-07-27 17:04 UTCGHSA enrichment
  6. 2026-07-27 02:33 UTCEG score recompute
  7. 2026-07-27 02:33 UTCVendor advisory
  8. 2026-07-27 02:33 UTCGHSA enrichment
  9. 2026-07-26 14:29 UTCEG score recompute
  10. 2026-07-26 14:29 UTCVendor advisory
  11. 2026-07-26 14:29 UTCGHSA enrichment
  12. 2026-07-25 14:18 UTCEPSS rescore
  13. 2026-07-24 14:18 UTCEPSS rescore
  14. 2026-07-23 14:18 UTCEPSS rescore
  15. 2026-07-23 03:19 UTCEG score recompute
  16. 2026-07-22 14:08 UTCEPSS rescore
  17. 2026-07-21 15:25 UTCEPSS rescore
  18. 2026-07-20 17:08 UTCEPSS rescore
  19. 2026-07-19 14:31 UTCEPSS rescore
  20. 2026-07-19 14:31 UTCEPSS rescore
  21. 2026-07-18 10:04 UTCEPSS rescore
  22. 2026-07-16 23:41 UTCGHSA enrichment
  23. 2026-07-16 17:03 UTCEPSS rescore
  24. 2026-07-16 11:44 UTCGHSA enrichment
  25. 2026-07-15 23:47 UTCGHSA enrichment
Show 51 more
  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 11:50 UTCGHSA enrichment
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-14 23:36 UTCGHSA enrichment
  7. 2026-07-14 11:33 UTCGHSA enrichment
  8. 2026-07-13 23:36 UTCGHSA enrichment
  9. 2026-07-13 22:31 UTCEPSS rescore
  10. 2026-07-13 11:39 UTCGHSA enrichment
  11. 2026-07-13 06:13 UTCEPSS rescore
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-12 23:39 UTCGHSA enrichment
  14. 2026-07-12 11:42 UTCGHSA enrichment
  15. 2026-07-12 05:46 UTCEPSS rescore
  16. 2026-07-11 23:44 UTCGHSA enrichment
  17. 2026-07-11 11:47 UTCGHSA enrichment
  18. 2026-07-10 23:49 UTCGHSA enrichment
  19. 2026-07-10 11:48 UTCGHSA enrichment
  20. 2026-07-09 23:50 UTCGHSA enrichment
  21. 2026-07-09 19:10 UTCEPSS rescore
  22. 2026-07-09 19:10 UTCEPSS rescore
  23. 2026-07-09 11:52 UTCGHSA enrichment
  24. 2026-07-08 23:55 UTCGHSA enrichment
  25. 2026-07-08 15:16 UTCEPSS rescore
  26. 2026-07-08 15:16 UTCEPSS rescore
  27. 2026-07-08 11:58 UTCEG score recompute▲ 7.80
  28. 2026-07-08 11:58 UTCGHSA enrichment
  29. 2026-07-08 04:32 UTCNVD updateCVSS v3 → 7.8 · severity → HIGH
  30. 2026-07-07 13:46 UTCEPSS rescore
  31. 2026-07-07 13:46 UTCEPSS rescore
  32. 2026-07-06 16:27 UTCEPSS rescore
  33. 2026-07-06 16:27 UTCEPSS rescore
  34. 2026-07-06 02:23 UTCEPSS rescore
  35. 2026-07-06 02:23 UTCEPSS rescore
  36. 2026-07-05 14:05 UTCGHSA enrichment
  37. 2026-07-05 02:31 UTCEPSS rescore
  38. 2026-07-05 02:30 UTCEPSS rescore
  39. 2026-07-04 06:31 UTCEPSS rescore
  40. 2026-07-04 06:31 UTCEPSS rescore
  41. 2026-07-02 16:33 UTCGHSA enrichment
  42. 2026-07-01 15:07 UTCEPSS rescore
  43. 2026-06-30 23:22 UTCEPSS rescore
  44. 2026-06-29 19:05 UTCGHSA enrichment
  45. 2026-06-29 14:06 UTCEPSS rescore
  46. 2026-06-29 14:06 UTCEPSS rescore
  47. 2026-06-28 14:07 UTCEPSS rescore
  48. 2026-06-28 04:56 UTCEPSS rescore
  49. 2026-06-28 04:56 UTCEPSS rescore
  50. 2026-06-26 21:37 UTCEG score recompute
  51. 2026-06-26 21:37 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-53294?
CVE-2026-53294 is a high vulnerability published on June 26, 2026. In the Linux kernel, the following vulnerability has been resolved: mailbox: mailbox-test: don't free the reused channel The RX channel can be aliased to the TX channel if it has a different MMIO. This special case needs to be handled when freeing the channels otherwise a double-free occurs.
When was CVE-2026-53294 disclosed?
CVE-2026-53294 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53294 actively exploited?
CVE-2026-53294 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-53294?
CVE-2026-53294 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-53294?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53294, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-53294

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