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RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv rxe_rcv() currently checks only that the incoming packet is at least header_size(pkt) bytes long before payload_size() is used. However, payload_size() subtracts both the attacker-controlled BTH pad field and RXE_ICRC_SIZE from pkt->paylen: payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt) - RXE_ICRC_SIZE This means a short packet can still make payload_size() underflow even if it includes enough bytes for the fixed headers. Simply requiring header_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a packet with a forged non-zero BTH pad can still leave payload_size() negative and pass an underflowed value to later receive-path users. Fix this by validating pkt->paylen against the full minimum length required by payload_size(): header_size(pkt) + bth_pad(pkt) + RXE_ICRC_SIZE.

Announced Source revision 1
Original source ↗

CVE-2026-46043

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-2026-46043

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": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "c4376c672c3648d5bdc31dfffc329d07164f93c4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "5fedefec757192dcaad29a664ac332c7601be144",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "2c0d71ef12f46c57d37bc571f3f2797db7eb50cc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "2fd4f8b749309a61c3f3f88ee8891d94f79e1240",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "f83519a4c122c9c7a850a2197648a9ff4c67c520",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "9b924f3a26b21330a837cfe72e819b6393bbeeaa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "e8ee0e792d475b1067c199ef0af1b6221fa6f43d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "7244491dab347f648e661da96dc0febadd9daec3",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_recv.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.86",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.27",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_recv.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46043

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40108 · Revision 1
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Publisher date
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