CVE-2026-45972

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-27. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

smb: client: fix potential UAF and double free in smb2_open_file()

Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

May 27, 2026

Last Modified

August 5, 2026

Advisory Details (9)

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

smb: client: fix potential UAF and double free in smb2_open_file() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4eda
generic

smb: client: fix potential UAF and double free in smb2_open_file() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81
generic

smb: client: fix potential UAF and double free in smb2_open_file() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73
generic

smb: client: fix potential UAF and double free in smb2_open_file() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4d339b219004869e96c4ce56b8891f83a38da4c0
generic

smb: client: fix potential UAF and double free in smb2_open_file() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151
generic

smb: client: fix potential UAF and double free in smb2_open_file() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74
redhat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45972.json
redhat

2481973 – (CVE-2026-45972) CVE-2026-45972 kernel: smb: client: fix potential UAF and double free in smb2_open_file()

https://bugzilla.redhat.com/show_bug.cgi?id=2481973
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-45972

Vendor Advisories for CVE-2026-45972(1)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-25ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-08-25ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-08-25ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-08-25ubuntu
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-08-25ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-08-25ubuntu

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

(3 across 3 ecosystems)
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 ... 6.18~rc7-1~exp1 (100 versions)6.18.14-1—

Weakness Classification(2)

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

All Vendor Advisories

(11)

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 / 162× 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 425 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. 2026-08-25 05:36 UTCEG score recompute
  11. 2026-08-25 05:36 UTCVendor advisory
  12. 2026-08-25 05:35 UTCGHSA enrichment
  13. 2026-08-23 23:59 UTCVendor advisory
  14. 2026-08-23 23:59 UTCGHSA enrichment
  15. 2026-08-23 19:27 UTCVendor advisory
  16. 2026-08-23 19:26 UTCGHSA enrichment
  17. 2026-08-23 15:26 UTCEG score recompute
  18. 2026-08-23 15:26 UTCVendor advisory
  19. 2026-08-23 15:26 UTCGHSA enrichment
  20. 2026-08-23 00:19 UTCEPSS rescore
  21. 2026-08-22 00:47 UTCEG score recompute
  22. 2026-08-22 00:47 UTCVendor advisory
  23. 2026-08-22 00:47 UTCGHSA enrichment
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-21 20:47 UTCEG score recompute
Show 75 more
  1. 2026-08-21 20:47 UTCVendor advisory
  2. 2026-08-21 20:47 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 21:40 UTCVendor advisory
  5. 2026-08-20 21:40 UTCGHSA enrichment
  6. 2026-08-20 17:39 UTCVendor advisory
  7. 2026-08-20 17:39 UTCGHSA enrichment
  8. 2026-08-20 12:33 UTCEG score recompute
  9. 2026-08-20 12:33 UTCVendor advisory
  10. 2026-08-20 12:33 UTCGHSA enrichment
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 13:20 UTCVendor advisory
  15. 2026-08-17 13:20 UTCGHSA enrichment
  16. 2026-08-17 09:20 UTCVendor advisory
  17. 2026-08-17 09:20 UTCGHSA enrichment
  18. 2026-08-16 16:23 UTCEG score recompute
  19. 2026-08-16 16:23 UTCVendor advisory
  20. 2026-08-16 16:23 UTCGHSA enrichment
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 10:53 UTCVendor advisory
  23. 2026-08-16 10:53 UTCGHSA enrichment
  24. 2026-08-16 06:53 UTCVendor advisory
  25. 2026-08-16 06:53 UTCGHSA enrichment
  26. 2026-08-16 02:53 UTCEG score recompute
  27. 2026-08-16 02:53 UTCVendor advisory
  28. 2026-08-16 02:53 UTCGHSA enrichment
  29. 2026-08-16 02:14 UTCEPSS rescore
  30. 2026-08-15 01:58 UTCEG score recompute
  31. 2026-08-15 01:58 UTCVendor advisory
  32. 2026-08-15 01:58 UTCGHSA enrichment
  33. 2026-08-15 01:30 UTCEPSS rescore
  34. 2026-08-14 21:58 UTCVendor advisory
  35. 2026-08-14 21:58 UTCGHSA enrichment
  36. 2026-08-14 17:58 UTCVendor advisory
  37. 2026-08-14 17:58 UTCGHSA enrichment
  38. 2026-08-14 13:30 UTCVendor advisory
  39. 2026-08-14 13:30 UTCGHSA enrichment
  40. 2026-08-14 09:30 UTCVendor advisory
  41. 2026-08-14 09:30 UTCGHSA enrichment
  42. 2026-08-14 05:30 UTCVendor advisory
  43. 2026-08-14 05:30 UTCGHSA enrichment
  44. 2026-08-14 01:30 UTCEG score recompute
  45. 2026-08-14 01:30 UTCVendor advisory
  46. 2026-08-14 01:30 UTCGHSA enrichment
  47. 2026-08-13 22:00 UTCEPSS rescore
  48. 2026-08-13 09:53 UTCVendor advisory
  49. 2026-08-13 09:53 UTCGHSA enrichment
  50. 2026-08-13 05:54 UTCVendor advisory
  51. 2026-08-13 05:54 UTCGHSA enrichment
  52. 2026-08-13 01:53 UTCVendor advisory
  53. 2026-08-13 01:53 UTCGHSA enrichment
  54. 2026-08-12 21:54 UTCVendor advisory
  55. 2026-08-12 21:54 UTCGHSA enrichment
  56. 2026-08-12 17:54 UTCVendor advisory
  57. 2026-08-12 17:54 UTCGHSA enrichment
  58. 2026-08-12 13:54 UTCEG score recompute
  59. 2026-08-12 13:54 UTCVendor advisory
  60. 2026-08-12 13:54 UTCGHSA enrichment
  61. 2026-08-12 13:51 UTCEPSS rescore
  62. 2026-08-12 09:35 UTCVendor advisory
  63. 2026-08-12 09:35 UTCGHSA enrichment
  64. 2026-08-12 02:32 UTCVendor advisory
  65. 2026-08-12 02:32 UTCGHSA enrichment
  66. 2026-08-11 22:32 UTCVendor advisory
  67. 2026-08-11 22:32 UTCGHSA enrichment
  68. 2026-08-11 18:33 UTCEG score recompute
  69. 2026-08-11 18:33 UTCVendor advisory
  70. 2026-08-11 18:33 UTCGHSA enrichment
  71. 2026-08-11 13:36 UTCVendor advisory
  72. 2026-08-11 13:36 UTCGHSA enrichment
  73. 2026-08-11 08:15 UTCVendor advisory
  74. 2026-08-11 08:15 UTCGHSA enrichment
  75. 2026-08-11 04:14 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45972?
CVE-2026-45972 is a critical vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2openfile() Zero out @erriov and @errbuftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.
When was CVE-2026-45972 disclosed?
CVE-2026-45972 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45972 actively exploited?
CVE-2026-45972 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 74.0% of all scored CVEs.
What is the CVSS score of CVE-2026-45972?
CVE-2026-45972 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45972?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45972, 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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