CVE-2026-98383 (GCVE-0-2026-98383)

Vulnerability from cvelistv5 – Published: 2026-10-09 07:34 – Updated: 2026-10-24 14:08
VLAI
Title
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL
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().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7064 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < 0f38472a2aa8704a6b514c0dfa9c32f3672b8f32 (git)
Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < cae8674489f26edf7553fdd660599466cbb4c32f (git)
Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < 9f9e57b5a3a033f95f49ef9d541340cdbcb80abb (git)
Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < df0072be6fc373cb22f9ea854d458b04e32a03cf (git)
Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < b9bb0e735460751b620156f800a4279a28573392 (git)
Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < 37b18688cd18fd86d2f35c212df1611862a26cd5 (git)
Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < fca71ead7a20290af1e2046983eeafae43d21af1 (git)
Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < e4a62833adff6ef0fe7c0b90393204fe3c26b5c5 (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "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()."
        }
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            "version": "3.1"
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              "value": "AV:L - The local bpf(BPF_PROG_LOAD) path reaches check_helper_call() and the patched lwt_seg6local_func_proto(), where attacker-authored bytecode requests bpf_lwt_seg6_adjust_srh() and bpf_skb_pull_data(); an RTM_NEWROUTE then attaches it. A received SRH packet merely executes that installed program and cannot create the unsafe helper sequence.\nAC:L - The attacker controls the helper order, SRH offset and length, and can inject a large non-linear SRv6 frame so bpf_skb_pull_data() deterministically reaches __pskb_pull_tail() and pskb_expand_head(). No race is required, and repeated packets reproduce the stale-pointer write.\nPR:L - bpf_prog_load() requires CAP_BPF and CAP_NET_ADMIN for BPF_PROG_TYPE_LWT_SEG6LOCAL, but BPF_F_TOKEN_FD and bpf_token_capable() support delegating both into a user namespace; rtnetlink_rcv_msg() separately accepts CAP_NET_ADMIN in the route\u0027s network namespace. Thus a host-unprivileged token holder can perform the complete setup.\nUI:N - The attacker loads the program, installs the End.BPF route, and injects the triggering SRv6 frame without any victim action.\nS:U - The stale srh pointer and resulting corruption occur in the same host kernel that processes the attacker\u0027s BPF program and packet; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - After skb-\u003ehead is freed, seg6_bpf_has_valid_srh() passes the dangling srh pointer to seg6_validate_srh(), which reads header fields and variable-length TLVs from reusable slab memory; its drop-versus-forward result also provides an observable contents oracle.\nI:H - seg6_bpf_has_valid_srh() executes srh-\u003ehdrlen = srh_state-\u003ehdrlen \u003e\u003e 3 through the dangling pointer, producing an attacker-valued one-byte write into freed slab memory that can corrupt a reclaimed object or allocator state and support control-flow compromise.\nA:H - The stale write in seg6_bpf_has_valid_srh() is a confirmed slab use-after-free and can trigger a KASAN panic or later kernel oops through corrupted freed-object state; the attacker can repeat it with additional packets."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL",
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    "datePublished": "2026-10-09T07:34:22.408Z",
    "dateReserved": "2026-09-25T10:25:14.345Z",
    "dateUpdated": "2026-10-24T14:08:40.964Z",
    "state": "PUBLISHED"
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      "title": "bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98383.json",
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          }
        ],
        "id": "CVE-2026-98383",
        "lastModified": "2026-10-24T14:16:40.360",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
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                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        },
        "published": "2026-10-09T08:16:56.800",
        "references": [
          {
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fca71ead7a20290af1e2046983eeafae43d21af1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-24T14:27:36+00:00",
      "cve": "CVE-2026-98383",
      "id": "CVE-2026-98383",
      "initial_release_date": "2026-10-09T00:00:00+00:00",
      "product_status:known_affected": "250",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98383.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-19T23:52:34Z",
      "cve": "CVE-2026-98383",
      "id": "CVE-2026-98383",
      "initial_release_date": "2026-10-09T16:52:12Z",
      "product_status:known_affected": "255",
      "product_status:known_not_affected": "93",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98383",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98383.json",
      "version": "3"
    }
  }
}



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