CVE-2026-45903

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 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:

bpf: Fix memory access flags in helper prototypes

After commit 37cce22dbd51 ("bpf: verifier: Refactor helper access type tracking"), the verifier started relying on the access type flags in helper function prototypes to perform memory access optimizations.

Currently, several helper functions utilizing ARG_PTR_TO_MEM lack the corresponding MEM_RDONLY or MEM_WRITE flags. This omission causes the verifier to incorrectly assume that the buffer contents are unchanged across the helper call. Consequently, the verifier may optimize away subsequent reads based on this wrong assumption, leading to correctness issues.

For bpf_get_stack_proto_raw_tp, the original MEM_RDONLY was incorrect since the helper writes to the buffer. Change it to ARG_PTR_TO_UNINIT_MEM which correctly indicates write access to potentially uninitialized memory.

Similar issues were recently addressed for specific helpers in commit ac44dcc788b9 ("bpf: Fix verifier assumptions of bpf_d_path's output buffer") and commit 2eb7648558a7 ("bpf: Specify access type of bpf_sysctl_get_name args").

Fix these prototypes by adding the correct memory access flags.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 24, 2026

Advisory Details (3)

Auto-updated Jun 24, 2026
No patch confirmed yet.
generic

bpf: Fix memory access flags in helper prototypes - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fdfe75161f6e8c41a7d3023fbb815b537107b806
generic

bpf: Fix memory access flags in helper prototypes - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/aa319592892068bd960c1a1c07bd621085b0c63d
generic

bpf: Fix memory access flags in helper prototypes - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/802eef5afb1865bc5536a5302c068ba2215a1f72

Vendor Advisories for CVE-2026-45903(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.18.14—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

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (103 versions)6.18.14-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 34× 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 194 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45903?
CVE-2026-45903 is a high vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: bpf: Fix memory access flags in helper prototypes After commit 37cce22dbd51 ("bpf: verifier: Refactor helper access type tracking"), the verifier started relying on the access type flags in helper function prototypes to perform…
When was CVE-2026-45903 disclosed?
CVE-2026-45903 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45903 actively exploited?
CVE-2026-45903 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 94.7% of all scored CVEs.
What is the CVSS score of CVE-2026-45903?
CVE-2026-45903 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-45903?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45903, 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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