CVE-2026-43303

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-08. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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:

mm/page_alloc: clear page->private in free_pages_prepare()

Several subsystems (slub, shmem, ttm, etc.) use page->private but don't clear it before freeing pages. When these pages are later allocated as high-order pages and split via split_page(), tail pages retain stale page->private values.

This causes a use-after-free in the swap subsystem. The swap code uses page->private to track swap count continuations, assuming freshly allocated pages have page->private == 0. When stale values are present, swap_count_continued() incorrectly assumes the continuation list is valid and iterates over uninitialized page->lru containing LIST_POISON values, causing a crash:

KASAN: maybe wild-memory-access in range [0xdead000000000100-0xdead000000000107] RIP: 0010:__do_sys_swapoff+0x1151/0x1860

Fix this by clearing page->private in free_pages_prepare(), ensuring all freed pages have clean state regardless of previous use.

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
6%
KEV
Not listed

Published

May 8, 2026

Last Modified

September 8, 2026

Advisory Details (3)

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

mm/page_alloc: clear page->private in free_pages_prepare() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb
generic

mm/page_alloc: clear page->private in free_pages_prepare() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9
generic

mm/page_alloc: clear page->private in free_pages_prepare() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f

Vendor Advisories for CVE-2026-43303(9)

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
redhatkernel-0:6.12.0-55.84.1.el10_02026-06-29redhat
redhatkernel-0:5.14.0-427.132.1.el9_42026-06-22redhat
redhatkernel-0:5.14.0-570.123.1.el9_62026-06-22redhat
redhatkernel-0:5.14.0-284.176.1.el9_22026-06-17redhat
redhatkernel-rt-0:5.14.0-284.176.1.rt14.461.el9_22026-06-17redhat
redhatkernel-0:5.14.0-687.12.1.el9_82026-05-28redhat
redhatkernel-0:6.12.0-211.18.1.el10_22026-05-28redhat
linuxKernel @ 6.1.176—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
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 ... 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.

Data Freshness Timeline

(refreshed 6× in last 7d / 33× 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 256 total refreshes for this CVE.

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

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

Frequently asked(5)

What is CVE-2026-43303?
CVE-2026-43303 is a high vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: mm/pagealloc: clear page->private in freepages_prepare() Several subsystems (slub, shmem, ttm, etc.) use page->private but don't clear it before freeing pages. When these pages are later allocated as high-order pages and split via…
When was CVE-2026-43303 disclosed?
CVE-2026-43303 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43303 actively exploited?
CVE-2026-43303 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 93.9% of all scored CVEs.
What is the CVSS score of CVE-2026-43303?
CVE-2026-43303 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-43303?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43303, 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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