CVE-2026-23243 (GCVE-0-2026-23243)
Vulnerability from cvelistv5 – Published: 2026-03-18 10:05 – Updated: 2026-09-08 08:45
VLAI
EPSS
VEX
Title
RDMA/umad: Reject negative data_len in ib_umad_write
Summary
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
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-17 17:47 UTC
Assigner
References
10 references
Impacted products
8 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2be8e3ee8efd6f99ce454115c29d09750915021a , < 1371ef6b1ecf3676b8942f5dfb3634fb0648128e
(git)
Affected: 2be8e3ee8efd6f99ce454115c29d09750915021a , < 362e45fd9069ffa1523f9f1633b606ebf72060d7 (git) Affected: 2be8e3ee8efd6f99ce454115c29d09750915021a , < 6eb2919474ca105c5b13d19574e25f0ddcf19ca2 (git) Affected: 2be8e3ee8efd6f99ce454115c29d09750915021a , < a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d (git) Affected: 2be8e3ee8efd6f99ce454115c29d09750915021a , < 9c80d688f402539dfc8f336de1380d6b4ee14316 (git) Affected: 2be8e3ee8efd6f99ce454115c29d09750915021a , < 205955f29c26330b1dc7fdeadd5bb97c38e26f56 (git) Affected: 2be8e3ee8efd6f99ce454115c29d09750915021a , < 52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b (git) Affected: 2be8e3ee8efd6f99ce454115c29d09750915021a , < 5551b02fdbfd85a325bb857f3a8f9c9f33397ed2 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.24
Unaffected: 0 , < 2.6.24 (semver) Unaffected: 5.10.252 , ≤ 5.10.* (semver) Unaffected: 5.15.202 , ≤ 5.15.* (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed |
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"nvd": "{\"cve\":{\"id\":\"CVE-2026-23243\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-18T11:16:16.090\",\"lastModified\":\"2026-07-14T13:18:27.407\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRDMA/umad: Reject negative data_len in ib_umad_write\\n\\nib_umad_write computes data_len from user-controlled count and the\\nMAD header sizes. With a mismatched user MAD header size and RMPP\\nheader length, data_len can become negative and reach ib_create_send_mad().\\nThis can make the padding calculation exceed the segment size and trigger\\nan out-of-bounds memset in alloc_send_rmpp_list().\\n\\nAdd an explicit check to reject negative data_len before creating the\\nsend buffer.\\n\\nKASAN splat:\\n[ 211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0\\n[ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102\\n[ 211.365867] ib_create_send_mad+0xa01/0x11b0\\n[ 211.365887] ib_umad_write+0x853/0x1c80\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nRDMA/umad: Rechazar data_len negativo en ib_umad_write\\n\\nib_umad_write calcula data_len a partir de un conteo controlado por el usuario y los tama\u00f1os de encabezado MAD. Con un tama\u00f1o de encabezado MAD de usuario no coincidente y una longitud de encabezado RMPP, data_len puede volverse negativo y alcanzar ib_create_send_mad(). Esto puede hacer que el c\u00e1lculo de relleno exceda el tama\u00f1o del segmento y desencadenar un memset fuera de l\u00edmites en alloc_send_rmpp_list().\\n\\nSe a\u00f1ade una verificaci\u00f3n expl\u00edcita para rechazar data_len negativo antes de crear el b\u00fafer de env\u00edo.\\n\\nKASAN splat:\\n[ 211.363464] ERROR: KASAN: slab-out-of-bounds en ib_create_send_mad+0xa01/0x11b0\\n[ 211.364077] Escritura de tama\u00f1o 220 en la direcci\u00f3n ffff88800c3fa1f8 por la tarea spray_thread/102\\n[ 211.365867] ib_create_send_mad+0xa01/0x11b0\\n[ 211.365887] 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"redhat_vex": {
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"current_release_date": "2026-07-17T16:42:04+00:00",
"cve": "CVE-2026-23243",
"id": "CVE-2026-23243",
"initial_release_date": "2026-03-18T00:00:00+00:00",
"product_status:fixed": "2295",
"product_status:known_affected": "36",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Linux kernel: Denial of service and memory corruption in RDMA umad",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23243.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-08-28T16:45:32Z",
"cve": "CVE-2026-23243",
"id": "CVE-2026-23243",
"initial_release_date": "2026-03-19T00:27:22Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "499",
"product_status:recommended": "779",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-23243",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23243.json",
"version": "33"
},
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On RDMA-enabled systems (HPC clusters, cloud servers), udev rules commonly grant access to unprivileged users. An ioctl to register a MAD agent is needed first but requires no special privileges.\\nUI:N - No user interaction is required. The attacker directly opens the device file, registers a MAD agent via ioctl, and triggers the bug by writing crafted data.\\nS:U - The vulnerability operates within kernel space and does not cross a security boundary such as a VM or sandbox escape.\\nC:H - The out-of-bounds memset write into slab memory can corrupt adjacent heap objects. In a controlled exploit, this memory corruption can be leveraged via heap spraying to gain arbitrary read primitives.\\nI:H - KASAN confirmed a slab out-of-bounds write of 220 bytes. This heap corruption can be exploited to overwrite adjacent slab objects, enabling arbitrary write primitives and potential code execution.\\nA:H - The out-of-bounds write corrupts slab memory, causing kernel crashes as confirmed by the KASAN splat. This is a reliable kernel panic/oops.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\", \"lessThan\": \"1371ef6b1ecf3676b8942f5dfb3634fb0648128e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\", \"lessThan\": \"362e45fd9069ffa1523f9f1633b606ebf72060d7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\", \"lessThan\": \"6eb2919474ca105c5b13d19574e25f0ddcf19ca2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\", \"lessThan\": \"a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\", \"lessThan\": \"9c80d688f402539dfc8f336de1380d6b4ee14316\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\", \"lessThan\": \"205955f29c26330b1dc7fdeadd5bb97c38e26f56\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\", \"lessThan\": \"52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2be8e3ee8efd6f99ce454115c29d09750915021a\", \"lessThan\": \"5551b02fdbfd85a325bb857f3a8f9c9f33397ed2\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/infiniband/core/user_mad.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.24\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.24\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.252\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.202\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.165\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.128\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.75\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/infiniband/core/user_mad.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e\"}, {\"url\": \"https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7\"}, {\"url\": \"https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2\"}, {\"url\": \"https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d\"}, {\"url\": \"https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316\"}, {\"url\": \"https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56\"}, {\"url\": \"https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b\"}, {\"url\": \"https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRDMA/umad: Reject negative data_len in ib_umad_write\\n\\nib_umad_write computes data_len from user-controlled count and the\\nMAD header sizes. With a mismatched user MAD header size and RMPP\\nheader length, data_len can become negative and reach ib_create_send_mad().\\nThis can make the padding calculation exceed the segment size and trigger\\nan out-of-bounds memset in alloc_send_rmpp_list().\\n\\nAdd an explicit check to reject negative data_len before creating the\\nsend buffer.\\n\\nKASAN splat:\\n[ 211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0\\n[ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102\\n[ 211.365867] ib_create_send_mad+0xa01/0x11b0\\n[ 211.365887] ib_umad_write+0x853/0x1c80\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.252\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.202\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.165\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.128\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.75\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.14\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.4\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"2.6.24\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:20:53.089Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-23243\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-08T08:45:08.401Z\", \"dateReserved\": \"2026-01-13T15:37:45.989Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-03-18T10:05:05.826Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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