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bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL An LWT_SEG6LOCAL program can invalidate its cached SRH with bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter may reallocate skb->head, leaving the per-CPU SRH pointer dangling. Post-program SRH validation then writes through that pointer. Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier rejects this unsafe helper combination. Other LWT program types continue to expose the helper through lwt_out_func_proto().

Announced Source revision 1
Original source ↗

CVE-2026-98383

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-2026-98383

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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
        "lessThan": "0f38472a2aa8704a6b514c0dfa9c32f3672b8f32",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
        "lessThan": "cae8674489f26edf7553fdd660599466cbb4c32f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
        "lessThan": "9f9e57b5a3a033f95f49ef9d541340cdbcb80abb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
        "lessThan": "df0072be6fc373cb22f9ea854d458b04e32a03cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
        "lessThan": "b9bb0e735460751b620156f800a4279a28573392",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
        "lessThan": "37b18688cd18fd86d2f35c212df1611862a26cd5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
        "lessThan": "fca71ead7a20290af1e2046983eeafae43d21af1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
        "lessThan": "e4a62833adff6ef0fe7c0b90393204fe3c26b5c5",
        "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": "4.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.18",
        "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-2026-98383

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#55589 · Revision 1
Added to Heist Feed
Publisher date
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