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
7.8EG
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:

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)
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
2%
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.

Patch Availability(26)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-08-23ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-08-23ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-08-23ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.186.196~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-08-23ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-08-23ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-08-23ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-08-23ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-08-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-23ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-08-23ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-23ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-08-23ubuntu
linuxKernel @ 5.10.253—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 ... 5.10.92-2 (53 versions)5.10.257-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
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 (119 versions)6.19.10-1—

Weakness Classification(1)

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

All Vendor Advisories

(25)

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 5× in last 7d / 70× 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 206 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 98.2% of all scored CVEs.
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.

Dependency Blast Radius

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