CVE-2026-23243RDMA/umad: Reject negative data_len in ib_umad_write
- 7.8HighCVSS base score
- 0.19%Exploitation in 30 daysEPSS · top 91% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 2be8e3ee8efd6f99ce454115c29d09750915021a – < 1371ef6b1ecf3676b8942f5dfb3634fb0648128e
- affected 2be8e3ee8efd6f99ce454115c29d09750915021a – < 362e45fd9069ffa1523f9f1633b606ebf72060d7
- affected 2be8e3ee8efd6f99ce454115c29d09750915021a – < 6eb2919474ca105c5b13d19574e25f0ddcf19ca2
- affected 2be8e3ee8efd6f99ce454115c29d09750915021a – < a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d
- affected 2be8e3ee8efd6f99ce454115c29d09750915021a – < 9c80d688f402539dfc8f336de1380d6b4ee14316
- affected 2be8e3ee8efd6f99ce454115c29d09750915021a – < 205955f29c26330b1dc7fdeadd5bb97c38e26f56
- affected 2be8e3ee8efd6f99ce454115c29d09750915021a – < 52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b
- affected 2be8e3ee8efd6f99ce454115c29d09750915021a – < 5551b02fdbfd85a325bb857f3a8f9c9f33397ed2
- affected 2.6.24
- unaffected < 2.6.24
- unaffected 5.10.252 – ≤ 5.10.*
- unaffected 5.15.202 – ≤ 5.15.*
- unaffected 6.1.165 – ≤ 6.1.*
- unaffected 6.6.128 – ≤ 6.6.*
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.14 – ≤ 6.18.*
- unaffected 6.19.4 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References11
- https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e (opens in a new tab)
- https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7 (opens in a new tab)
- https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2 (opens in a new tab)
- https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d (opens in a new tab)
- https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316 (opens in a new tab)
- https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56 (opens in a new tab)
- https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b (opens in a new tab)
- https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-12804 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-23243)Record last updated .