CVE-2026-43258

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. 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%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

alpha: fix user-space corruption during memory compaction

Alpha systems can suffer sporadic user-space crashes and heap corruption when memory compaction is enabled.

Symptoms include SIGSEGV, glibc allocator failures (e.g. "unaligned tcache chunk"), and compiler internal errors. The failures disappear when compaction is disabled or when using global TLB invalidation.

The root cause is insufficient TLB shootdown during page migration. Alpha relies on ASN-based MM context rollover for instruction cache coherency, but this alone is not sufficient to prevent stale data or instruction translations from surviving migration.

Fix this by introducing a migration-specific helper that combines:

  • MM context invalidation (ASN rollover),
  • immediate per-CPU TLB invalidation (TBI),
  • synchronous cross-CPU shootdown when required.

The helper is used only by migration/compaction paths to avoid changing global TLB semantics.

Additionally, update flush_tlb_other(), pte_clear(), to use READ_ONCE()/WRITE_ONCE() for correct SMP memory ordering.

This fixes observed crashes on both UP and SMP Alpha systems.

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
4%
KEV
Not listed

Published

May 6, 2026

Last Modified

August 5, 2026

Advisory Details (4)

Auto-updated May 11, 2026
No patch confirmed yet.
generic

alpha: fix user-space corruption during memory compaction - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dd5712f3379cfe760267cdd28ff957d9ab4e51c7
generic

alpha: fix user-space corruption during memory compaction - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6
generic

alpha: fix user-space corruption during memory compaction - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bab8d762a8dbb816b10011e13b87d1bca91e5f77
generic

alpha: fix user-space corruption during memory compaction - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f

Vendor Advisories for CVE-2026-43258(1)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-08-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-08-23ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-23ubuntu
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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (350 versions)——
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 ... 6.19~rc8-1~exp1 (116 versions)6.19.6-1—

Weakness Classification(1)

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

All Vendor Advisories

(10)

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 / 30× 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 209 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-43258?
CVE-2026-43258 is a high vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: alpha: fix user-space corruption during memory compaction Alpha systems can suffer sporadic user-space crashes and heap corruption when memory compaction is enabled. Symptoms include SIGSEGV, glibc allocator failures (e.g.…
When was CVE-2026-43258 disclosed?
CVE-2026-43258 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43258 actively exploited?
CVE-2026-43258 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 96.5% of all scored CVEs.
What is the CVSS score of CVE-2026-43258?
CVE-2026-43258 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-43258?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43258, 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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