CVE-2026-45964

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-27. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path

Commit 5940d1cf9f42 ("SUNRPC: Rebalance a kref in auth_gss.c") added a kref_get(&gss_auth->kref) call to balance the gss_put_auth() done in gss_release_msg(), but forgot to add a corresponding kref_put() on the error path when kstrdup_const() fails.

If service_name is non-NULL and kstrdup_const() fails, the function jumps to err_put_pipe_version which calls put_pipe_version() and kfree(gss_msg), but never releases the gss_auth reference. This leads to a kref leak where the gss_auth structure is never freed.

Add a forward declaration for gss_free_callback() and call kref_put() in the err_put_pipe_version error path to properly release the reference taken earlier.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 16, 2026

Advisory Details (8)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e464e26b2457005c87e158570498274b9f3b90c7
generic

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dd2fdc3504592d85e549c523b054898a036a6afe
generic

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c20f925214249bb4fc04f7e197bea142a6438af6
generic

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b559be2ec6cdb2e9c2c36c23fbbd4690d8a5c3f7
generic

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a2d4e9a76de0b2178001214ba5de5bf94a7354aa
generic

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a1bc9561b617ec7e2d09e6c134d1db8fcf9ca4a6
generic

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/655c9ba9915f05266998dbbf4b76b3c79b8a70aa
generic

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3b2b6c42070ce4204936288253baf101e995c2d3

Vendor Advisories for CVE-2026-45964(1)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1055.56~22.04.1) @ jammy2026-07-12ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-07-12ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-07-12ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-07-12ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-07-12ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-07-12ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-07-12ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-07-12ubuntu

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

(8)

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 / 35× 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. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-25 14:18 UTCEPSS rescore
  4. 2026-07-23 14:18 UTCEPSS rescore
  5. 2026-07-23 03:16 UTCEG score recompute
  6. 2026-07-22 14:08 UTCEPSS rescore
  7. 2026-07-21 15:24 UTCEPSS rescore
  8. 2026-07-20 17:08 UTCEPSS rescore
  9. 2026-07-19 14:31 UTCEPSS rescore
  10. 2026-07-19 02:29 UTCEPSS rescore
  11. 2026-07-18 10:04 UTCEPSS rescore
  12. 2026-07-16 17:03 UTCEPSS rescore
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 02:00 UTCEPSS rescore
  15. 2026-07-13 06:13 UTCEPSS rescore
  16. 2026-07-12 05:46 UTCEPSS rescore
  17. 2026-07-12 01:39 UTCVendor advisory
  18. 2026-07-12 01:38 UTCGHSA enrichment
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-09 19:10 UTCEPSS rescore
  21. 2026-07-09 00:19 UTCGHSA enrichment
  22. 2026-07-08 15:16 UTCEPSS rescore
  23. 2026-07-07 13:46 UTCEPSS rescore
  24. 2026-07-06 16:27 UTCEPSS rescore
  25. 2026-07-04 06:31 UTCEPSS rescore
Show 69 more
  1. 2026-07-01 15:07 UTCEPSS rescore
  2. 2026-07-01 11:15 UTCGHSA enrichment
  3. 2026-06-30 23:22 UTCEPSS rescore
  4. 2026-06-29 14:27 UTCGHSA enrichment
  5. 2026-06-29 14:06 UTCEPSS rescore
  6. 2026-06-29 14:06 UTCEPSS rescore
  7. 2026-06-28 14:07 UTCEPSS rescore
  8. 2026-06-28 07:26 UTCGHSA enrichment
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-28 04:56 UTCEPSS rescore
  11. 2026-06-27 06:10 UTCGHSA enrichment
  12. 2026-06-27 03:08 UTCEPSS rescore
  13. 2026-06-26 02:48 UTCGHSA enrichment
  14. 2026-06-25 13:49 UTCEPSS rescore
  15. 2026-06-25 01:36 UTCEG score recompute▲ 5.50
  16. 2026-06-25 01:35 UTCGHSA enrichment
  17. 2026-06-24 14:05 UTCEPSS rescore
  18. 2026-06-23 21:33 UTCEPSS rescore
  19. 2026-06-23 21:33 UTCEPSS rescore
  20. 2026-06-22 14:25 UTCEPSS rescore
  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-21 14:56 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
  24. 2026-06-21 01:59 UTCEPSS rescore
  25. 2026-06-21 01:59 UTCEPSS rescore
  26. 2026-06-19 19:26 UTCEPSS rescore
  27. 2026-06-19 19:26 UTCEPSS rescore
  28. 2026-06-18 17:52 UTCEPSS rescore
  29. 2026-06-18 17:52 UTCEPSS rescore
  30. 2026-06-17 17:53 UTCEPSS rescore
  31. 2026-06-16 17:52 UTCEPSS rescore
  32. 2026-06-16 03:45 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  33. 2026-06-15 17:49 UTCEPSS rescore
  34. 2026-06-15 13:33 UTCGHSA enrichment
  35. 2026-06-13 23:00 UTCEPSS rescore
  36. 2026-06-12 23:12 UTCEPSS rescore
  37. 2026-06-12 23:12 UTCEPSS rescore
  38. 2026-06-12 13:43 UTCGHSA enrichment
  39. 2026-06-11 14:00 UTCEPSS rescore
  40. 2026-06-10 22:18 UTCEPSS rescore
  41. 2026-06-10 13:22 UTCEPSS rescore
  42. 2026-06-10 13:22 UTCEPSS rescore
  43. 2026-06-09 16:42 UTCGHSA enrichment
  44. 2026-06-08 14:17 UTCEPSS rescore
  45. 2026-06-08 14:17 UTCEPSS rescore
  46. 2026-06-07 15:25 UTCEPSS rescore
  47. 2026-06-07 15:25 UTCEPSS rescore
  48. 2026-06-06 19:41 UTCGHSA enrichment
  49. 2026-06-06 13:47 UTCEPSS rescore
  50. 2026-06-06 13:47 UTCEPSS rescore
  51. 2026-06-05 22:47 UTCEPSS rescore
  52. 2026-06-05 06:10 UTCEPSS rescore
  53. 2026-06-05 06:10 UTCEPSS rescore
  54. 2026-06-04 13:12 UTCEPSS rescore
  55. 2026-06-04 13:12 UTCEPSS rescore
  56. 2026-06-03 22:40 UTCGHSA enrichment
  57. 2026-06-02 20:13 UTCEPSS rescore
  58. 2026-06-01 13:52 UTCEPSS rescore
  59. 2026-06-01 13:52 UTCEPSS rescore
  60. 2026-06-01 01:38 UTCGHSA enrichment
  61. 2026-05-31 22:30 UTCEPSS rescore
  62. 2026-05-31 22:30 UTCEPSS rescore
  63. 2026-05-31 00:16 UTCEPSS rescore
  64. 2026-05-31 00:16 UTCEPSS rescore
  65. 2026-05-29 13:44 UTCEPSS rescore
  66. 2026-05-29 13:44 UTCEPSS rescore
  67. 2026-05-28 13:44 UTCEPSS rescore
  68. 2026-05-28 13:44 UTCEPSS rescore
  69. 2026-05-27 14:14 UTCEG score recompute

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45964?
CVE-2026-45964 is a medium vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: SUNRPC: fix gssauth kref leak in gssalloc_msg error path Commit 5940d1cf9f42 ("SUNRPC: Rebalance a kref in auth_gss.c") added a krefget(&gssauth->kref) call to balance the gssputauth() done in gssreleasemsg(), but forgot to add a…
When was CVE-2026-45964 disclosed?
CVE-2026-45964 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45964 actively exploited?
CVE-2026-45964 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 94.4% of all scored CVEs.
What is the CVSS score of CVE-2026-45964?
CVE-2026-45964 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-45964?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45964, 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.

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