CVE-2026-53296

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: free channels on probe error

On probe error, free the previously obtained channels. This not only prevents a leak, but also UAF scenarios because the client structure will be removed nonetheless because it was allocated with devm.

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: free channels on probe error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c02053a9055d5fdfd32432287cca8958db1d5bc5
generic

mailbox: mailbox-test: free channels on probe error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/81c9e7e4030e71391ab479c4c6e17b64802577aa
generic

mailbox: mailbox-test: free channels on probe error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/742001919653e7313b4e91780c5d108be1692365
generic

mailbox: mailbox-test: free channels on probe error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6c6ce2ccb4fcf1617fec83f91b21aa0265f30701
generic

mailbox: mailbox-test: free channels on probe error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/187069ccc3474516af32350e20d7e449160fa6de
generic

mailbox: mailbox-test: free channels on probe error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/15c4cc3850cfe1b973eb7b63c02314b267f06a64
generic

mailbox: mailbox-test: free channels on probe error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0ad8c4a03a358de7811ba1ab8cbd1fe76ad0ff6b
generic

mailbox: mailbox-test: free channels on probe error - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/02beb178e2e159daeb8f992d7abb16a37da31664

Vendor Advisories for CVE-2026-53296(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-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-09-06ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-06ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-06ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-06ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-09-06ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-09-06ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-09-06ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-09-06ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1009.9) @ resolute2026-09-06ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-09-06ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-09-06ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-06ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-09-06ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-09-06ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-09-06ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-06ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-06ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-09-06ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-09-06ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-06ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-06ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-06ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-09-06ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-06ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-09-06ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-06ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-09-06ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-09-06ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-09-06ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-09-06ubuntu

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 (140 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 8× in last 7d / 90× 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 252 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-53296?
CVE-2026-53296 is a high vulnerability published on June 26, 2026. In the Linux kernel, the following vulnerability has been resolved: mailbox: mailbox-test: free channels on probe error On probe error, free the previously obtained channels. This not only prevents a leak, but also UAF scenarios because the client structure will be removed nonetheless because it…
When was CVE-2026-53296 disclosed?
CVE-2026-53296 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-2026-53296 actively exploited?
CVE-2026-53296 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 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-53296?
CVE-2026-53296 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-53296?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53296, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53296

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