CVE-2026-23243

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

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

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 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)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

March 18, 2026

Last Modified

September 8, 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(18)

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

Patch Availability(31)

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-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-08ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-08ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-08ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-08ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-09-08ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-09-08ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-09-08ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-09-08ubuntu
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
redhatkernel-rt-0:3.10.0-1160.155.1.rt56.1307.el72026-07-17redhat
redhatkernel-0:3.10.0-1160.153.1.el72026-06-22redhat
redhatkernel-0:4.18.0-305.194.1.el8_42026-06-17redhat
redhatkernel-0:4.18.0-372.196.1.el8_62026-06-17redhat
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-rt-0:5.14.0-284.172.1.rt14.457.el9_22026-05-20redhat
redhatkernel-0:4.18.0-477.143.1.el8_82026-05-20redhat
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-0:5.14.0-570.112.1.el9_62026-05-06redhat
redhatkernel-rt-0:5.14.0-70.178.1.rt21.250.el9_02026-05-06redhat
redhatkernel-0:5.14.0-70.178.1.el9_02026-05-06redhat
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.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
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 (103 versions)6.18.14-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 5× in last 7d / 27× 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 229 total refreshes for this CVE.

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

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 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-2026-23243 actively exploited?
CVE-2026-23243 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 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-23243?
CVE-2026-23243 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-23243

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