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RDMA/umad: Reject negative data_len in ib_umad_write

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-23243

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-23243

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
  }
]
Related CVEs
CVE-2026-23243

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39827 · Revision 1
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Publisher date
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