CVE-2026-45884

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
Trending — 5 sources updated this week
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:

apparmor: avoid per-cpu hold underflow in aa_get_buffer

When aa_get_buffer() pulls from the per-cpu list it unconditionally decrements cache->hold. If hold reaches 0 while count is still non-zero, the unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a very long time, so aa_put_buffer() never returns buffers to the global list, which can starve other CPUs and force repeated kmalloc(aa_g_path_max) allocations.

Guard the decrement so hold never underflows.

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 25, 2026

Advisory Details (4)

Auto-updated Jun 25, 2026
No patch confirmed yet.
generic

apparmor: avoid per-cpu hold underflow in aa_get_buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92
generic

apparmor: avoid per-cpu hold underflow in aa_get_buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923ead
generic

apparmor: avoid per-cpu hold underflow in aa_get_buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169
generic

apparmor: avoid per-cpu hold underflow in aa_get_buffer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2

Vendor Advisories for CVE-2026-45884(1)

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

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-lowlatency-hwe-22.04-edge (6.8.0-134.134.1~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-14ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-14ubuntu
linuxKernel @ 6.12.75—osv

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

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (103 versions)6.18.14-1—

Weakness Classification(1)

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

All Vendor Advisories

(12)

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 10× in last 7d / 39× 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 205 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45884?
CVE-2026-45884 is a medium vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: apparmor: avoid per-cpu hold underflow in aagetbuffer When aagetbuffer() pulls from the per-cpu list it unconditionally decrements cache->hold. If hold reaches 0 while count is still non-zero, the unsigned decrement wraps to…
When was CVE-2026-45884 disclosed?
CVE-2026-45884 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45884 actively exploited?
CVE-2026-45884 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 94.5% of all scored CVEs.
What is the CVSS score of CVE-2026-45884?
CVE-2026-45884 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-45884?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45884, 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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