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bpf: Fix bpf_sock context code generation

Type: advisorySource: Official CVE List1 source record

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).

Announced Source revision 1
Original source ↗

CVE-2026-98590

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-2026-98590

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": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
        "lessThan": "e3ddcf4aeb342d4de2e5761c7042270d454752de",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
        "lessThan": "4a41d064facc3330e176ecbbf5b0026ed18a5c69",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
        "lessThan": "70288599d1754e157df8326239316dbdf08ea33c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
        "lessThan": "ea4dc96c902ccfa49dd3e4f23c443dab4a74b018",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
        "lessThan": "b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
        "lessThan": "d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
        "lessThan": "84ebb991ae985149079ae9ab51b7e3ba25a9ff53",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c3c16f2ea6d20159903cf93afbb1155f3d8348d5",
        "lessThan": "4a4852376e3a2727ea40e61143d6d7c22bb6dfad",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/core/filter.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/core/filter.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98590

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38610 · Revision 1
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Publisher date
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