CVE-2026-43112

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

When cifs_sanitize_prepath is called with an empty string or a string containing only delimiters (e.g., "/"), the current logic attempts to check *(cursor2 - 1) before cursor2 has advanced. This results in an out-of-bounds read.

This patch adds an early exit check after stripping prepended delimiters. If no path content remains, the function returns NULL.

The bug was identified via manual audit and verified using a standalone test case compiled with AddressSanitizer, which triggered a SEGV on affected inputs.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
27.7%
KEV
Not listed

Published

May 6, 2026

Last Modified

July 22, 2026

Advisory Details (5)

Auto-updated May 8, 2026
No patch confirmed yet.
generic

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/86f9c23e0814cfdffda9eedf0c591c51ba209010
generic

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/78ec5bf2f589ec7fd8f169394bfeca541b077317
generic

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d4fe469fe7dbff7d874c196bb680a82f2625d95
generic

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3
generic

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439

Vendor Advisories for CVE-2026-43112(3)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.15.209—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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 31× 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 105 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-43112?
CVE-2026-43112 is a high vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: fs/smb/client: fix out-of-bounds read in cifssanitizeprepath When cifssanitizeprepath is called with an empty string or a string containing only delimiters (e.g., "/"), the current logic attempts to check *(cursor2 - 1) before…
When was CVE-2026-43112 disclosed?
CVE-2026-43112 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43112 actively exploited?
CVE-2026-43112 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43112?
CVE-2026-43112 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-43112?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43112, 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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