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
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

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
7.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

Published

June 26, 2026

Last Modified

July 8, 2026

Advisory Details (8)

Auto-updated Jul 8, 2026
Patch available.
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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-09-23ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-09-23ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1009.9) @ resolute2026-09-23ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-09-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-23ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-23ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-09-23ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-09-23ubuntu
ubuntulinux-tools-aws-edge (5.15.0.1112.119~20.04.1) @ focal2026-09-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-23ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-23ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-09-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-23ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-09-23ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-23ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-09-23ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-23ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-09-23ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-09-23ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-09-23ubuntu

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 rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)
  • every version up to 5.10.259-1: fixed in 5.10.259-1
—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)
  • every version up to 6.1.176-1~deb11u1: fixed in 6.1.176-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)
  • every version up to 6.1.176-1: fixed in 6.1.176-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (141 versions)
  • every version up to 7.0.10-1: fixed in 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 6× in last 7d / 36× 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 287 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-02 17:56 UTCEPSS rescore
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-29 15:22 UTCEPSS rescore
  12. 2026-09-28 13:51 UTCEPSS rescore
  13. 2026-09-27 13:48 UTCEPSS rescore
  14. 2026-09-26 15:59 UTCEPSS rescore
  15. 2026-09-26 00:27 UTCEPSS rescore
  16. 2026-09-23 17:53 UTCEPSS rescore
  17. 2026-09-23 07:42 UTCEG score recompute
  18. 2026-09-23 07:42 UTCVendor advisory
  19. 2026-09-23 07:41 UTCGHSA enrichment
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-18 07:07 UTCEG score recompute
  23. 2026-09-18 07:07 UTCVendor advisory
  24. 2026-09-18 07:07 UTCGHSA enrichment
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 75 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 00:57 UTCEG score recompute
  3. 2026-09-14 00:57 UTCVendor advisory
  4. 2026-09-14 00:56 UTCGHSA enrichment
  5. 2026-09-13 16:47 UTCEPSS rescore
  6. 2026-09-13 09:28 UTCVendor advisory
  7. 2026-09-13 09:28 UTCGHSA enrichment
  8. 2026-09-12 15:23 UTCEG score recompute
  9. 2026-09-12 15:23 UTCVendor advisory
  10. 2026-09-12 15:22 UTCGHSA enrichment
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-10 09:35 UTCEPSS rescore
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-07 16:01 UTCEPSS rescore
  15. 2026-09-06 14:51 UTCEG score recompute
  16. 2026-09-06 14:51 UTCVendor advisory
  17. 2026-09-06 14:51 UTCGHSA enrichment
  18. 2026-09-06 13:47 UTCEPSS rescore
  19. 2026-09-04 05:06 UTCEPSS rescore
  20. 2026-09-02 14:12 UTCEPSS rescore
  21. 2026-09-01 13:54 UTCEPSS rescore
  22. 2026-09-01 04:40 UTCEPSS rescore
  23. 2026-08-30 19:17 UTCEPSS rescore
  24. 2026-08-30 19:15 UTCEG score recompute
  25. 2026-08-30 19:15 UTCVendor advisory
  26. 2026-08-30 19:15 UTCGHSA enrichment
  27. 2026-08-30 01:22 UTCEPSS rescore
  28. 2026-08-28 21:41 UTCEPSS rescore
  29. 2026-08-27 22:54 UTCEG score recompute
  30. 2026-08-27 22:54 UTCVendor advisory
  31. 2026-08-27 22:53 UTCGHSA enrichment
  32. 2026-08-27 14:25 UTCEPSS rescore
  33. 2026-08-26 14:46 UTCEPSS rescore
  34. 2026-08-25 13:49 UTCEPSS rescore
  35. 2026-08-25 00:43 UTCEG score recompute
  36. 2026-08-25 00:43 UTCVendor advisory
  37. 2026-08-25 00:43 UTCGHSA enrichment
  38. 2026-08-24 12:45 UTCEG score recompute
  39. 2026-08-24 12:45 UTCVendor advisory
  40. 2026-08-24 12:45 UTCGHSA enrichment
  41. 2026-08-23 21:43 UTCVendor advisory
  42. 2026-08-23 21:43 UTCGHSA enrichment
  43. 2026-08-23 09:46 UTCEG score recompute
  44. 2026-08-23 09:46 UTCVendor advisory
  45. 2026-08-23 09:46 UTCGHSA enrichment
  46. 2026-08-23 00:19 UTCEPSS rescore
  47. 2026-08-22 21:49 UTCVendor advisory
  48. 2026-08-22 21:49 UTCGHSA enrichment
  49. 2026-08-22 09:20 UTCEG score recompute
  50. 2026-08-22 09:20 UTCVendor advisory
  51. 2026-08-22 09:20 UTCGHSA enrichment
  52. 2026-08-21 23:49 UTCEPSS rescore
  53. 2026-08-21 18:26 UTCVendor advisory
  54. 2026-08-21 18:26 UTCGHSA enrichment
  55. 2026-08-21 06:26 UTCEG score recompute
  56. 2026-08-21 06:26 UTCVendor advisory
  57. 2026-08-21 06:26 UTCGHSA enrichment
  58. 2026-08-20 22:55 UTCEPSS rescore
  59. 2026-08-20 18:29 UTCVendor advisory
  60. 2026-08-20 18:29 UTCGHSA enrichment
  61. 2026-08-20 06:32 UTCEG score recompute
  62. 2026-08-20 06:32 UTCVendor advisory
  63. 2026-08-20 06:32 UTCGHSA enrichment
  64. 2026-08-19 17:04 UTCEPSS rescore
  65. 2026-08-19 12:37 UTCVendor advisory
  66. 2026-08-19 12:36 UTCGHSA enrichment
  67. 2026-08-18 23:30 UTCEG score recompute
  68. 2026-08-18 23:30 UTCVendor advisory
  69. 2026-08-18 23:30 UTCGHSA enrichment
  70. 2026-08-18 13:48 UTCEPSS rescore
  71. 2026-08-17 13:47 UTCEPSS rescore
  72. 2026-08-17 08:07 UTCVendor advisory
  73. 2026-08-17 08:07 UTCGHSA enrichment
  74. 2026-08-16 20:10 UTCEG score recompute
  75. 2026-08-16 20:10 UTCVendor advisory

Related CVEs(same vendor + same CWE)

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 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 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-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?
A fix for CVE-2026-53294 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53294 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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