CVE-2026-45972

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-27. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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

July 15, 2026

Advisory Details (9)

Auto-updated Jul 25, 2026
Patch available. Sources: redhat.
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
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/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/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74
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/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/4d339b219004869e96c4ce56b8891f83a38da4c0

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(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-07-12ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-07-12ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-07-12ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-07-12ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-07-12ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-07-12ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-07-12ubuntu

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(2)

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

All Vendor Advisories

(7)

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 / 50× 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 207 total refreshes for this CVE.

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

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 July 15, 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 74.2% of all scored CVEs.
What is the CVSS score of CVE-2026-45972?
CVE-2026-45972 has a CVSS v3 base score of 9.8 (NVD).
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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