CVE-2026-23243 (GCVE-0-2026-23243)
Vulnerability from cvelistv5
Published
2026-03-18 10:05
Modified
2026-08-05 12:20
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 2be8e3ee8efd6f99ce454115c29d09750915021a
Version: 2be8e3ee8efd6f99ce454115c29d09750915021a
Version: 2be8e3ee8efd6f99ce454115c29d09750915021a
Version: 2be8e3ee8efd6f99ce454115c29d09750915021a
Version: 2be8e3ee8efd6f99ce454115c29d09750915021a
Version: 2be8e3ee8efd6f99ce454115c29d09750915021a
Version: 2be8e3ee8efd6f99ce454115c29d09750915021a
Version: 2be8e3ee8efd6f99ce454115c29d09750915021a
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{\"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\", 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\"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\": \"2026-07-14T12:46:14.352Z\", \"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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