FKIE_CVE-2026-98590

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-19 10:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_sock context code generation Currently, the ctx access code reads the rx_queue_mapping field with either a 4-byte or 2-byte load. The rest of the bits in the register are marked known zero by the verifier. However, the emitted ctx access code places in the register on certain the special value (-1) using BPF_MOV_IMM64, which gets sign-extended to turn on all the bits in the register. By shifting this value right, the program ends up with a value at runtime above what the verifier assumes is possible. Fix this by ensuring the read value is as wide as the assumed size. Use MOV32 instructions instead of MOV64 instructions to keep the upper bits zero as assumed by the verifier. Also properly report the size of the destination variable (the bpf_sock field, 4 bytes) instead of the source (the socket field, 2 bytes).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4a41d064facc3330e176ecbbf5b0026ed18a5c69
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4a4852376e3a2727ea40e61143d6d7c22bb6dfad
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70288599d1754e157df8326239316dbdf08ea33c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84ebb991ae985149079ae9ab51b7e3ba25a9ff53
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3ddcf4aeb342d4de2e5761c7042270d454752de
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea4dc96c902ccfa49dd3e4f23c443dab4a74b018
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e3ddcf4aeb342d4de2e5761c7042270d454752de",
              "status": "affected",
              "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
              "versionType": "git"
            },
            {
              "lessThan": "4a41d064facc3330e176ecbbf5b0026ed18a5c69",
              "status": "affected",
              "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
              "versionType": "git"
            },
            {
              "lessThan": "70288599d1754e157df8326239316dbdf08ea33c",
              "status": "affected",
              "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
              "versionType": "git"
            },
            {
              "lessThan": "ea4dc96c902ccfa49dd3e4f23c443dab4a74b018",
              "status": "affected",
              "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
              "versionType": "git"
            },
            {
              "lessThan": "b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73",
              "status": "affected",
              "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
              "versionType": "git"
            },
            {
              "lessThan": "d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c",
              "status": "affected",
              "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
              "versionType": "git"
            },
            {
              "lessThan": "84ebb991ae985149079ae9ab51b7e3ba25a9ff53",
              "status": "affected",
              "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
              "versionType": "git"
            },
            {
              "lessThan": "4a4852376e3a2727ea40e61143d6d7c22bb6dfad",
              "status": "affected",
              "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bpf_sock context code generation\n\nCurrently, the ctx access code reads the rx_queue_mapping\nfield with either a 4-byte or 2-byte load. The rest of the bits\nin the register are marked known zero by the verifier. However,\nthe emitted ctx access code places in the register on certain\nthe special value (-1) using BPF_MOV_IMM64, which gets sign-extended\nto turn on all the bits in the register. By shifting this value right,\nthe program ends up with a value at runtime above what the verifier\nassumes is possible.\n\nFix this by ensuring the read value is as wide as the assumed size.\nUse MOV32 instructions instead of MOV64 instructions to keep\nthe upper bits zero as assumed by the verifier. Also properly report\nthe size of the destination variable (the bpf_sock field, 4 bytes) instead\nof the source (the socket field, 2 bytes)."
    }
  ],
  "id": "CVE-2026-98590",
  "lastModified": "2026-10-19T10:19:20.057",
  "metrics": {},
  "published": "2026-10-18T16:17:11.610",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4a41d064facc3330e176ecbbf5b0026ed18a5c69"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4a4852376e3a2727ea40e61143d6d7c22bb6dfad"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70288599d1754e157df8326239316dbdf08ea33c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/84ebb991ae985149079ae9ab51b7e3ba25a9ff53"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e3ddcf4aeb342d4de2e5761c7042270d454752de"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ea4dc96c902ccfa49dd3e4f23c443dab4a74b018"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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