CVE-2026-23243

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-03-18. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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

RDMA/umad: Reject negative data_len in ib_umad_write

ib_umad_write computes data_len from user-controlled count and the MAD header sizes. With a mismatched user MAD header size and RMPP header length, data_len can become negative and reach ib_create_send_mad(). This can make the padding calculation exceed the segment size and trigger an out-of-bounds memset in alloc_send_rmpp_list().

Add an explicit check to reject negative data_len before creating the send buffer.

KASAN splat: [ 211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0 [ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102 [ 211.365867] ib_create_send_mad+0xa01/0x11b0 [ 211.365887] ib_umad_write+0x853/0x1c80

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
3.0%
KEV
Not listed

Published

March 18, 2026

Last Modified

July 14, 2026

Advisory Details (8)

Auto-updated Jun 10, 2026
No patch confirmed yet.
generic

RDMA/umad: Reject negative data_len in ib_umad_write - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d
generic

RDMA/umad: Reject negative data_len in ib_umad_write - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316
generic

RDMA/umad: Reject negative data_len in ib_umad_write - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2
generic

RDMA/umad: Reject negative data_len in ib_umad_write - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2
generic

RDMA/umad: Reject negative data_len in ib_umad_write - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b
generic

RDMA/umad: Reject negative data_len in ib_umad_write - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7
generic

RDMA/umad: Reject negative data_len in ib_umad_write - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56
generic

RDMA/umad: Reject negative data_len in ib_umad_write - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e

Vendor Advisories for CVE-2026-23243(17)

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

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:4.18.0-553.126.1.el8_102026-05-28redhat
redhatkernel-rt-0:4.18.0-553.126.1.rt7.467.el8_102026-05-28redhat
redhatkernel-0:5.14.0-427.127.1.el9_42026-05-27redhat
redhatkernel-0:5.14.0-284.172.1.el9_22026-05-26redhat
redhatkernel-0:4.18.0-477.143.1.el8_82026-05-20redhat
redhatkernel-rt-0:5.14.0-284.172.1.rt14.457.el9_22026-05-20redhat
redhatkernel-0:5.14.0-687.5.1.el9_82026-05-19redhat
redhatkernel-0:6.12.0-211.7.1.el10_22026-05-19redhat
redhatkernel-0:6.12.0-55.72.1.el10_02026-05-11redhat
redhatkernel-0:5.14.0-70.178.1.el9_02026-05-06redhat
redhatkernel-rt-0:5.14.0-70.178.1.rt21.250.el9_02026-05-06redhat
redhatkernel-0:5.14.0-570.112.1.el9_62026-05-06redhat
linuxKernel @ 5.10.252—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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 48× 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 123 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
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  5. 2026-07-13 22:30 UTCEPSS rescore
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  8. 2026-07-12 05:46 UTCEPSS rescore
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  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-08 15:15 UTCEPSS rescore
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  15. 2026-07-06 16:27 UTCEPSS rescore
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  17. 2026-07-06 02:23 UTCEPSS rescore
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  20. 2026-07-01 15:06 UTCEPSS rescore
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  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-29 14:06 UTCEPSS rescore
  25. 2026-06-29 06:02 UTCOSV refresh
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  1. 2026-06-28 14:07 UTCEPSS rescore
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  3. 2026-06-28 04:56 UTCEPSS rescore
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  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-25 13:49 UTCEPSS rescore
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  8. 2026-06-24 14:05 UTCEPSS rescore
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  10. 2026-06-23 21:33 UTCEPSS rescore
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  18. 2026-06-19 19:25 UTCEPSS rescore
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  23. 2026-06-16 17:52 UTCEPSS rescore
  24. 2026-06-15 17:48 UTCEPSS rescore
  25. 2026-06-14 23:18 UTCEPSS rescore
  26. 2026-06-13 23:00 UTCEPSS rescore
  27. 2026-06-13 23:00 UTCEPSS rescore
  28. 2026-06-12 23:12 UTCEPSS rescore
  29. 2026-06-11 23:50 UTCEG score recompute
  30. 2026-06-11 23:50 UTCVendor advisory
  31. 2026-06-11 23:50 UTCGHSA enrichment
  32. 2026-06-11 14:00 UTCEPSS rescore
  33. 2026-06-10 22:18 UTCEPSS rescore
  34. 2026-06-10 18:52 UTCEG score recompute
  35. 2026-06-10 18:52 UTCVendor advisory
  36. 2026-06-10 18:52 UTCGHSA enrichment
  37. 2026-06-10 13:22 UTCEPSS rescore
  38. 2026-06-10 05:48 UTCEG score recompute
  39. 2026-06-10 05:48 UTCVendor advisory
  40. 2026-06-10 05:48 UTCGHSA enrichment
  41. 2026-06-09 16:35 UTCEG score recompute
  42. 2026-06-09 16:35 UTCVendor advisory
  43. 2026-06-09 16:35 UTCGHSA enrichment
  44. 2026-06-08 14:17 UTCEPSS rescore
  45. 2026-06-08 14:17 UTCEPSS rescore
  46. 2026-06-08 03:30 UTCEG score recompute
  47. 2026-06-08 03:30 UTCVendor advisory
  48. 2026-06-08 03:30 UTCGHSA enrichment
  49. 2026-06-07 15:25 UTCEPSS rescore
  50. 2026-06-07 15:24 UTCEPSS rescore
  51. 2026-06-07 14:27 UTCEG score recompute
  52. 2026-06-07 14:27 UTCVendor advisory
  53. 2026-06-07 14:27 UTCGHSA enrichment
  54. 2026-06-06 13:47 UTCEPSS rescore
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  68. 2026-06-01 08:43 UTCOSV refresh
  69. 2026-05-31 22:30 UTCEPSS rescore
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  71. 2026-05-31 00:16 UTCEPSS rescore
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  74. 2026-05-29 13:44 UTCEPSS rescore
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Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-23243?
CVE-2026-23243 is a high vulnerability published on March 18, 2026. In the Linux kernel, the following vulnerability has been resolved: RDMA/umad: Reject negative datalen in ibumad_write ibumadwrite computes data_len from user-controlled count and the MAD header sizes. With a mismatched user MAD header size and RMPP header length, datalen can become negative and…
When was CVE-2026-23243 disclosed?
CVE-2026-23243 was first published in the National Vulnerability Database on March 18, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23243 actively exploited?
CVE-2026-23243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23243?
CVE-2026-23243 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-23243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23243, 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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