Vulnerability-Lookup

FKIE_CVE-2026-23243

Vulnerability from fkie_nvd - Published: 2026-03-18 11:16 - Updated: 2026-05-21 15:52

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.24

JSON

To clipboard

{
  "configurations": [
    {
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        {
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      "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] ib_umad_write+0x853/0x1c80"
    }
  ],
  "id": "CVE-2026-23243",
  "lastModified": "2026-05-21T15:52:23.883",
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          "attackVector": "LOCAL",
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "type": "Secondary"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-787"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-03-18 10:05 – Updated: 2026-05-11 22:03

Title

RDMA/umad: Reject negative data_len in ib_umad_write

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/1371ef6b1ecf3676b…
https://git.kernel.org/stable/c/362e45fd9069ffa15…
https://git.kernel.org/stable/c/6eb2919474ca105c5…
https://git.kernel.org/stable/c/a6a3e4af10993cb9e…
https://git.kernel.org/stable/c/9c80d688f402539df…
https://git.kernel.org/stable/c/205955f29c26330b1…
https://git.kernel.org/stable/c/52ab82cc5cf8ada5c…
https://git.kernel.org/stable/c/5551b02fdbfd85a32…

Impacted products

2 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)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/user_mad.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
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              "versionType": "semver"
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              "versionType": "semver"
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              "version": "6.6.128",
              "versionType": "semver"
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              "version": "6.12.75",
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              "status": "unaffected",
              "version": "6.18.14",
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              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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          "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"
        }
      ],
      "metrics": [
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          "cvssV3_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",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:03:05.550Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2"
        }
      ],
      "title": "RDMA/umad: Reject negative data_len in ib_umad_write",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23243",
    "datePublished": "2026-03-18T10:05:05.826Z",
    "dateReserved": "2026-01-13T15:37:45.989Z",
    "dateUpdated": "2026-05-11T22:03:05.550Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-23243

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

Tags

Sightings

Nomenclature