FKIE_CVE-2026-98383

Vulnerability from fkie_nvd - Published: 2026-10-09 08:16 - Updated: 2026-10-09 08:16
Severity
Summary
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0f38472a2aa8704a6b514c0dfa9c32f3672b8f32
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37b18688cd18fd86d2f35c212df1611862a26cd5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f9e57b5a3a033f95f49ef9d541340cdbcb80abb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9bb0e735460751b620156f800a4279a28573392
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cae8674489f26edf7553fdd660599466cbb4c32f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df0072be6fc373cb22f9ea854d458b04e32a03cf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e4a62833adff6ef0fe7c0b90393204fe3c26b5c5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fca71ead7a20290af1e2046983eeafae43d21af1
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": "0f38472a2aa8704a6b514c0dfa9c32f3672b8f32",
              "status": "affected",
              "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
              "versionType": "git"
            },
            {
              "lessThan": "cae8674489f26edf7553fdd660599466cbb4c32f",
              "status": "affected",
              "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
              "versionType": "git"
            },
            {
              "lessThan": "9f9e57b5a3a033f95f49ef9d541340cdbcb80abb",
              "status": "affected",
              "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
              "versionType": "git"
            },
            {
              "lessThan": "df0072be6fc373cb22f9ea854d458b04e32a03cf",
              "status": "affected",
              "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
              "versionType": "git"
            },
            {
              "lessThan": "b9bb0e735460751b620156f800a4279a28573392",
              "status": "affected",
              "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
              "versionType": "git"
            },
            {
              "lessThan": "37b18688cd18fd86d2f35c212df1611862a26cd5",
              "status": "affected",
              "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
              "versionType": "git"
            },
            {
              "lessThan": "fca71ead7a20290af1e2046983eeafae43d21af1",
              "status": "affected",
              "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
              "versionType": "git"
            },
            {
              "lessThan": "e4a62833adff6ef0fe7c0b90393204fe3c26b5c5",
              "status": "affected",
              "version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
              "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": "4.18"
            },
            {
              "lessThan": "4.18",
              "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-rc5",
              "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: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL\n\nAn LWT_SEG6LOCAL program can invalidate its cached SRH with\nbpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter\nmay reallocate skb-\u003ehead, leaving the per-CPU SRH pointer dangling.\nPost-program SRH validation then writes through that pointer.\n\nDisallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier\nrejects this unsafe helper combination. Other LWT program types continue\nto expose the helper through lwt_out_func_proto()."
    }
  ],
  "id": "CVE-2026-98383",
  "lastModified": "2026-10-09T08:16:56.800",
  "metrics": {},
  "published": "2026-10-09T08:16:56.800",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0f38472a2aa8704a6b514c0dfa9c32f3672b8f32"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37b18688cd18fd86d2f35c212df1611862a26cd5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f9e57b5a3a033f95f49ef9d541340cdbcb80abb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b9bb0e735460751b620156f800a4279a28573392"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cae8674489f26edf7553fdd660599466cbb4c32f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/df0072be6fc373cb22f9ea854d458b04e32a03cf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e4a62833adff6ef0fe7c0b90393204fe3c26b5c5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fca71ead7a20290af1e2046983eeafae43d21af1"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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