CVE-2026-23243 (GCVE-0-2026-23243)

Vulnerability from cvelistv5 – Published: 2026-03-18 10:05 – Updated: 2026-06-17 17:47
VLAI
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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
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)
Create a notification for this product.
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)
Create a notification for this product.
Show details on NVD website
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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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Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.24.1\",\"versionEndExcluding\":\"5.10.252\",\"matchCriteriaId\":\"2373214A-3D90-42DB-82C4-E1879374793C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"4002FC2B-1456-4666-B240-0EBF590C4671\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.165\",\"matchCriteriaId\":\"797C7F46-D0BE-4FB8-A502-C5EF8E6B6654\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.128\",\"matchCriteriaId\":\"851E9353-6C09-4CC9-877E-E09DB164A3C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"BCE16369-98ED-41CF-8995-DFDC10B288D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.14\",\"matchCriteriaId\":\"BF463CB7-1F58-4607-B847-77ED23E4B9B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.4\",\"matchCriteriaId\":\"672A3E79-EC03-479D-8503-361DFBDC8092\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.24:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"6F3E61F3-1CF1-4176-94CD-89A408BCFC96\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-08T12:23:27+00:00",
      "cve": "CVE-2026-23243",
      "id": "CVE-2026-23243",
      "initial_release_date": "2026-03-18T00:00:00+00:00",
      "product_status:fixed": "2283",
      "product_status:known_affected": "47",
      "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"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-23243\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-17T17:47:24.163717Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-17T17:47:29.147Z\"}}], \"cna\": {\"title\": \"RDMA/umad: Reject negative data_len in ib_umad_write\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}}], \"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\": \"2026-05-11T22:03:05.550Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23243\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-17T17:47:33.620Z\", \"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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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.


Detection rules are retrieved from Rulezet.