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
7%
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(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-08-25ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-08-25ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-08-25ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-08-25ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-25ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-08-25ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-25ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-08-25ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-08-25ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-08-25ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1009.9) @ resolute2026-08-25ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-25ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-08-25ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-08-25ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-08-25ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-08-25ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-08-25ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-08-25ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-08-25ubuntu

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.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (137 versions)7.0.10-1—

Weakness Classification(1)

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

All Vendor Advisories

(25)

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 31× in last 7d / 156× 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.

Showing the most recent 100 of 230 total refreshes for this CVE.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-25 00:43 UTCEG score recompute
  4. 2026-08-25 00:43 UTCVendor advisory
  5. 2026-08-25 00:43 UTCGHSA enrichment
  6. 2026-08-24 12:45 UTCEG score recompute
  7. 2026-08-24 12:45 UTCVendor advisory
  8. 2026-08-24 12:45 UTCGHSA enrichment
  9. 2026-08-23 21:43 UTCVendor advisory
  10. 2026-08-23 21:43 UTCGHSA enrichment
  11. 2026-08-23 09:46 UTCEG score recompute
  12. 2026-08-23 09:46 UTCVendor advisory
  13. 2026-08-23 09:46 UTCGHSA enrichment
  14. 2026-08-23 00:19 UTCEPSS rescore
  15. 2026-08-22 21:49 UTCVendor advisory
  16. 2026-08-22 21:49 UTCGHSA enrichment
  17. 2026-08-22 09:20 UTCEG score recompute
  18. 2026-08-22 09:20 UTCVendor advisory
  19. 2026-08-22 09:20 UTCGHSA enrichment
  20. 2026-08-21 23:49 UTCEPSS rescore
  21. 2026-08-21 18:26 UTCVendor advisory
  22. 2026-08-21 18:26 UTCGHSA enrichment
  23. 2026-08-21 06:26 UTCEG score recompute
  24. 2026-08-21 06:26 UTCVendor advisory
  25. 2026-08-21 06:26 UTCGHSA enrichment
Show 75 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 18:29 UTCVendor advisory
  3. 2026-08-20 18:29 UTCGHSA enrichment
  4. 2026-08-20 06:32 UTCEG score recompute
  5. 2026-08-20 06:32 UTCVendor advisory
  6. 2026-08-20 06:32 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 12:37 UTCVendor advisory
  9. 2026-08-19 12:36 UTCGHSA enrichment
  10. 2026-08-18 23:30 UTCEG score recompute
  11. 2026-08-18 23:30 UTCVendor advisory
  12. 2026-08-18 23:30 UTCGHSA enrichment
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 08:07 UTCVendor advisory
  16. 2026-08-17 08:07 UTCGHSA enrichment
  17. 2026-08-16 20:10 UTCEG score recompute
  18. 2026-08-16 20:10 UTCVendor advisory
  19. 2026-08-16 20:10 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 08:13 UTCEG score recompute
  22. 2026-08-16 08:13 UTCVendor advisory
  23. 2026-08-16 08:13 UTCGHSA enrichment
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 20:17 UTCVendor advisory
  26. 2026-08-15 20:17 UTCGHSA enrichment
  27. 2026-08-15 08:15 UTCEG score recompute
  28. 2026-08-15 08:15 UTCVendor advisory
  29. 2026-08-15 08:15 UTCGHSA enrichment
  30. 2026-08-15 01:30 UTCEPSS rescore
  31. 2026-08-14 18:15 UTCVendor advisory
  32. 2026-08-14 18:15 UTCGHSA enrichment
  33. 2026-08-14 06:19 UTCEG score recompute
  34. 2026-08-14 06:19 UTCVendor advisory
  35. 2026-08-14 06:19 UTCGHSA enrichment
  36. 2026-08-13 22:00 UTCEPSS rescore
  37. 2026-08-13 18:22 UTCVendor advisory
  38. 2026-08-13 18:22 UTCGHSA enrichment
  39. 2026-08-13 04:59 UTCVendor advisory
  40. 2026-08-13 04:58 UTCGHSA enrichment
  41. 2026-08-12 17:02 UTCEG score recompute
  42. 2026-08-12 17:02 UTCVendor advisory
  43. 2026-08-12 17:02 UTCGHSA enrichment
  44. 2026-08-12 13:51 UTCEPSS rescore
  45. 2026-08-12 05:05 UTCVendor advisory
  46. 2026-08-12 05:05 UTCGHSA enrichment
  47. 2026-08-11 17:08 UTCEG score recompute
  48. 2026-08-11 17:08 UTCVendor advisory
  49. 2026-08-11 17:08 UTCGHSA enrichment
  50. 2026-08-11 05:07 UTCEG score recompute
  51. 2026-08-11 05:07 UTCVendor advisory
  52. 2026-08-11 05:07 UTCGHSA enrichment
  53. 2026-08-11 00:00 UTCEPSS rescore
  54. 2026-08-10 17:11 UTCVendor advisory
  55. 2026-08-10 17:11 UTCGHSA enrichment
  56. 2026-08-10 04:15 UTCVendor advisory
  57. 2026-08-10 04:15 UTCGHSA enrichment
  58. 2026-08-09 16:18 UTCEG score recompute
  59. 2026-08-09 16:18 UTCVendor advisory
  60. 2026-08-09 16:18 UTCGHSA enrichment
  61. 2026-08-09 13:46 UTCEPSS rescore
  62. 2026-08-09 04:22 UTCEG score recompute
  63. 2026-08-09 04:22 UTCVendor advisory
  64. 2026-08-09 04:22 UTCGHSA enrichment
  65. 2026-08-08 16:37 UTCEPSS rescore
  66. 2026-08-08 16:26 UTCVendor advisory
  67. 2026-08-08 16:26 UTCGHSA enrichment
  68. 2026-08-08 04:29 UTCVendor advisory
  69. 2026-08-08 04:29 UTCGHSA enrichment
  70. 2026-08-07 16:32 UTCEG score recompute
  71. 2026-08-07 16:32 UTCVendor advisory
  72. 2026-08-07 16:32 UTCGHSA enrichment
  73. 2026-08-07 04:36 UTCVendor advisory
  74. 2026-08-07 04:36 UTCGHSA enrichment
  75. 2026-08-06 16:39 UTCEG score recompute

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 92.9% 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

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