CVE-2026-43458

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

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

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: 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:

serial: caif: hold tty->link reference in ldisc_open and ser_release

A reproducer triggers a KASAN slab-use-after-free in pty_write_room() when caif_serial's TX path calls tty_write_room(). The faulting access is on tty->link->port.

Hold an extra kref on tty->link for the lifetime of the caif_serial line discipline: get it in ldisc_open() and drop it in ser_release(), and also drop it on the ldisc_open() error path.

With this change applied, the reproducer no longer triggers the UAF in my testing.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
1.9%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 21, 2026

Advisory Details (8)

Auto-updated Jun 4, 2026
No patch confirmed yet.
generic

serial: caif: hold tty->link reference in ldisc_open and ser_release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3
generic

serial: caif: hold tty->link reference in ldisc_open and ser_release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7
generic

serial: caif: hold tty->link reference in ldisc_open and ser_release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089
generic

serial: caif: hold tty->link reference in ldisc_open and ser_release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d
generic

serial: caif: hold tty->link reference in ldisc_open and ser_release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c
generic

serial: caif: hold tty->link reference in ldisc_open and ser_release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a
generic

serial: caif: hold tty->link reference in ldisc_open and ser_release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98
generic

serial: caif: hold tty->link reference in ldisc_open and ser_release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1

Vendor Advisories for CVE-2026-43458(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× 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 132 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-43458?
CVE-2026-43458 is a high vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: serial: caif: hold tty->link reference in ldiscopen and serrelease A reproducer triggers a KASAN slab-use-after-free in ptywriteroom() when caifserial's TX path calls ttywrite_room(). The faulting access is on tty->link->port. Hold…
When was CVE-2026-43458 disclosed?
CVE-2026-43458 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43458 actively exploited?
CVE-2026-43458 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43458?
CVE-2026-43458 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-43458?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43458, 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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