CVE-2026-43089

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-06. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

xfrm_user: fix info leak in build_mapping()

struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

May 6, 2026

Last Modified

September 8, 2026

Advisory Details (8)

Auto-updated Aug 2, 2026
No patch confirmed yet.
generic

xfrm_user: fix info leak in build_mapping() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c
generic

xfrm_user: fix info leak in build_mapping() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d3125c541a96fb3c0fc7210112684baf22b6c24d
generic

xfrm_user: fix info leak in build_mapping() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f
generic

xfrm_user: fix info leak in build_mapping() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32
generic

xfrm_user: fix info leak in build_mapping() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/700c9622b23c33b5933e6dcea816492c064e4e10
generic

xfrm_user: fix info leak in build_mapping() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5a1a4b049ddde41466ccac0daeec326254b133f2
generic

xfrm_user: fix info leak in build_mapping() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/521385cbd50ca9474396d88462fcdfa6489685d9
generic

xfrm_user: fix info leak in build_mapping() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1beb76b2053b68c491b78370794b8ff63c8f8c02

Vendor Advisories for CVE-2026-43089(1)

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

Patch Availability(27)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-08ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1106.110~20.04.1) @ focal2026-09-08ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-09-08ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1063.71~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-08ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-09-08ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-09-08ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-09-08ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-08ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-08ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-09-08ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-09-08ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-09-08ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1059.62~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-08ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-09-08ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-09-08ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-09-08ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-09-08ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-09-08ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-09-08ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-09-08ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-09-08ubuntu
linuxKernel @ 5.10.258—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

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
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 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (129 versions)6.19.14-1—

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 8× in last 7d / 35× 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 195 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 14:53 UTCEPSS rescore
  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. 2026-09-08 09:46 UTCVendor advisory
  8. 2026-09-08 09:46 UTCGHSA enrichment
  9. 2026-09-08 09:02 UTCEG score recompute
  10. 2026-09-08 09:02 UTCVendor advisory
  11. 2026-09-08 09:01 UTCGHSA enrichment
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-28 21:41 UTCEPSS rescore
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-26 14:46 UTCEPSS rescore
  22. 2026-08-25 13:49 UTCEPSS rescore
  23. 2026-08-23 20:26 UTCEG score recompute
  24. 2026-08-23 20:26 UTCVendor advisory
  25. 2026-08-23 20:26 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 00:19 UTCEPSS rescore
  2. 2026-08-21 23:49 UTCEPSS rescore
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-17 12:59 UTCEG score recompute
  8. 2026-08-17 12:59 UTCVendor advisory
  9. 2026-08-17 12:59 UTCGHSA enrichment
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 04:56 UTCEG score recompute
  12. 2026-08-16 04:56 UTCVendor advisory
  13. 2026-08-16 04:56 UTCGHSA enrichment
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 01:30 UTCEPSS rescore
  16. 2026-08-15 01:15 UTCVendor advisory
  17. 2026-08-15 01:15 UTCGHSA enrichment
  18. 2026-08-14 03:31 UTCEG score recompute
  19. 2026-08-14 03:31 UTCVendor advisory
  20. 2026-08-14 03:31 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-12 21:19 UTCEG score recompute
  23. 2026-08-12 21:19 UTCVendor advisory
  24. 2026-08-12 21:19 UTCGHSA enrichment
  25. 2026-08-12 13:51 UTCEPSS rescore
  26. 2026-08-11 23:19 UTCEG score recompute
  27. 2026-08-11 23:19 UTCVendor advisory
  28. 2026-08-11 23:18 UTCGHSA enrichment
  29. 2026-08-11 13:43 UTCEPSS rescore
  30. 2026-08-11 01:34 UTCEG score recompute
  31. 2026-08-11 01:34 UTCVendor advisory
  32. 2026-08-11 01:34 UTCGHSA enrichment
  33. 2026-08-11 00:00 UTCEPSS rescore
  34. 2026-08-10 00:22 UTCEG score recompute
  35. 2026-08-10 00:22 UTCVendor advisory
  36. 2026-08-10 00:22 UTCGHSA enrichment
  37. 2026-08-09 13:46 UTCEPSS rescore
  38. 2026-08-09 02:37 UTCEG score recompute
  39. 2026-08-09 02:37 UTCVendor advisory
  40. 2026-08-09 02:37 UTCGHSA enrichment
  41. 2026-08-08 16:37 UTCEPSS rescore
  42. 2026-08-07 17:52 UTCEG score recompute
  43. 2026-08-07 17:52 UTCVendor advisory
  44. 2026-08-07 17:52 UTCGHSA enrichment
  45. 2026-08-06 20:08 UTCEG score recompute
  46. 2026-08-06 20:08 UTCVendor advisory
  47. 2026-08-06 20:08 UTCGHSA enrichment
  48. 2026-08-06 13:46 UTCEPSS rescore
  49. 2026-08-05 22:23 UTCEG score recompute
  50. 2026-08-05 22:23 UTCVendor advisory
  51. 2026-08-05 22:23 UTCGHSA enrichment
  52. 2026-08-05 19:17 UTCEPSS rescore
  53. 2026-08-04 15:10 UTCEPSS rescore
  54. 2026-08-04 10:38 UTCEPSS rescore
  55. 2026-08-04 00:42 UTCEG score recompute
  56. 2026-08-04 00:42 UTCVendor advisory
  57. 2026-08-04 00:42 UTCGHSA enrichment
  58. 2026-08-03 10:36 UTCEPSS rescore
  59. 2026-08-03 02:57 UTCVendor advisory
  60. 2026-08-03 02:57 UTCGHSA enrichment
  61. 2026-08-02 05:13 UTCEG score recompute
  62. 2026-08-02 05:13 UTCVendor advisory
  63. 2026-08-02 05:13 UTCGHSA enrichment
  64. 2026-08-02 02:27 UTCEPSS rescore
  65. 2026-08-01 04:16 UTCEPSS rescore
  66. 2026-07-30 16:28 UTCEPSS rescore
  67. 2026-07-30 01:30 UTCEPSS rescore
  68. 2026-07-28 15:36 UTCEPSS rescore
  69. 2026-07-27 14:13 UTCEPSS rescore
  70. 2026-07-26 14:54 UTCEPSS rescore
  71. 2026-07-26 14:54 UTCEPSS rescore
  72. 2026-07-25 14:18 UTCEPSS rescore
  73. 2026-07-24 14:17 UTCEPSS rescore
  74. 2026-07-23 14:18 UTCEPSS rescore
  75. 2026-07-23 03:13 UTCEG score recompute

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

Frequently asked(5)

What is CVE-2026-43089?
CVE-2026-43089 is a medium vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrmuser: fix info leak in buildmapping() struct xfrmusersaid has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole…
When was CVE-2026-43089 disclosed?
CVE-2026-43089 was first published in the National Vulnerability Database on May 6, 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-2026-43089 actively exploited?
CVE-2026-43089 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 97.2% of all scored CVEs.
What is the CVSS score of CVE-2026-43089?
CVE-2026-43089 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-43089?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43089, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-43089

Explore →

Is Your Infrastructure Affected by CVE-2026-43089?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs