CVE-2026-98382 (GCVE-0-2026-98382)

Vulnerability from cvelistv5 – Published: 2026-10-09 07:34 – Updated: 2026-10-24 14:08
VLAI
Title
bpf: Reject dev-bound-only programs on other devices
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject dev-bound-only programs on other devices __bpf_offload_dev_match() falls back to comparing offdev pointers after an exact netdev mismatch. Bound-only programs normally have NULL offdevs, so unrelated netdevs compare equal. A bound-only program on an offload-registered netdev can instead inherit a real offdev and match a sibling port. With CAP_BPF and CAP_NET_ADMIN, a caller can use bpf(BPF_LINK_CREATE) with a different target ifindex to run metadata kfuncs specialized for the bound driver on the target driver's xdp_buff. Running a veth-bound program on tun reads beyond tun's bare stack xdp_buff as a veth_xdp_buff. Oops: general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:veth_xdp_rx_timestamp (drivers/net/veth.c:1673) Call Trace: ... tun_build_skb (drivers/net/tun.c:1739) tun_get_user (drivers/net/tun.c:1856) tun_chr_write_iter (drivers/net/tun.c:2091) vfs_write (fs/read_write.c:595 fs/read_write.c:687) ksys_write (fs/read_write.c:739) do_syscall_64 (arch/x86/entry/syscall_64.c:84) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt Restrict non-offloaded programs to exact netdev matches and retain the shared-offdev fallback only for genuinely offloaded multi-port programs.
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 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < e57f04194361574493e3e6cf0b9e9c69e4ae9791 (git)
Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < 0dceda331180617aeeb22381e8480b37f18ba08b (git)
Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < 940b626854de200e6187777d42114727daca617c (git)
Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < bb375f3c5990e29851894f20ebc4b9dbc6676126 (git)
Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < 6db1ce73e9853f533eb7f413f14ba00f8ec6f80d (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (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)
guessed Create a notification for this product.
Show details on NVD website
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{
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          "product": "Linux",
          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject dev-bound-only programs on other devices\n\n__bpf_offload_dev_match() falls back to comparing offdev pointers after an\nexact netdev mismatch. Bound-only programs normally have NULL offdevs, so\nunrelated netdevs compare equal. A bound-only program on an\noffload-registered netdev can instead inherit a real offdev and match a\nsibling port. With CAP_BPF and CAP_NET_ADMIN, a caller can use\nbpf(BPF_LINK_CREATE) with a different target ifindex to run metadata kfuncs\nspecialized for the bound driver on the target driver\u0027s xdp_buff. Running a\nveth-bound program on tun reads beyond tun\u0027s bare stack xdp_buff as a\nveth_xdp_buff.\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n  RIP: 0010:veth_xdp_rx_timestamp (drivers/net/veth.c:1673)\n  Call Trace:\n   ...\n   tun_build_skb (drivers/net/tun.c:1739)\n   tun_get_user (drivers/net/tun.c:1856)\n   tun_chr_write_iter (drivers/net/tun.c:2091)\n   vfs_write (fs/read_write.c:595 fs/read_write.c:687)\n   ksys_write (fs/read_write.c:739)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:84)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nRestrict non-offloaded programs to exact netdev matches and retain the\nshared-offdev fallback only for genuinely offloaded multi-port programs."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "value": "AV:L - bpf(BPF_LINK_CREATE) reaches link_create(), bpf_xdp_link_attach(), dev_xdp_install(), and patched __bpf_offload_dev_match(), which accepts a program whose prog_ifindex names another local netdev; no network protocol carries the mismatched ifindex.\nAC:L - The attacker can bind programs to both veth and tun to create their NULL-offdev entries, attach the veth-bound program to tun, and write a packet through tun_chr_write_iter(); the mismatch is deterministic and requires no race or external device state.\nPR:L - bpf_prog_load() requires bpf_token_capable() for CAP_BPF and CAP_NET_ADMIN, which BPF-token delegation can satisfy in a user namespace; tun_set_iff() checks CAP_NET_ADMIN against net-\u003euser_ns, permitting this path in delegated container deployments.\nUI:N - The attacker creates the devices, loads and attaches both programs, and triggers execution by writing to their own tun file descriptor; no victim action is involved.\nS:U - The incorrectly specialized metadata kfunc dereferences and can modify memory inside the same host kernel executing the XDP program; no VM, IOMMU, or other separate security authority is crossed.\nC:H - bpf_dev_bound_resolve_kfunc() specializes the call to veth_xdp_rx_timestamp(), which casts tun\u0027s bare stack xdp_buff to veth_xdp_buff, treats the adjacent word as an skb pointer, and returns skb_hwtstamps()-\u003ehwtstamp to the BPF program, providing an unbounded kernel-read primitive.\nI:H - veth_xdp_rx_hash() passes the same bogus skb pointer to skb_get_hash(); when no hash is present, __skb_get_hash_net() calls __skb_set_sw_hash() and writes hash, l4_hash, and sw_hash through that attacker-influenceable pointer.\nA:H - tun_build_skb() runs the mismatched program from tun_chr_write_iter(), and the demonstrated veth_xdp_rx_timestamp() invalid dereference produces a general-protection fault followed by a kernel panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:08:39.904Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/e57f04194361574493e3e6cf0b9e9c69e4ae9791"
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      "title": "bpf: Reject dev-bound-only programs on other devices",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98382",
    "datePublished": "2026-10-09T07:34:21.718Z",
    "dateReserved": "2026-09-25T10:25:14.345Z",
    "dateUpdated": "2026-10-24T14:08:39.904Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "cve": "CVE-2026-98382",
      "date": "2026-11-01",
      "epss": "0.00161",
      "percentile": "0.05303"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:41:41.000Z",
      "cve": "CVE-2026-98382",
      "id": "msrc_CVE-2026-98382",
      "initial_release_date": "2026-10-10T01:10:44.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bpf: Reject dev-bound-only programs on other devices",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98382.json",
      "version": "4"
    },
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                "versions": [
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject dev-bound-only programs on other devices\n\n__bpf_offload_dev_match() falls back to comparing offdev pointers after an\nexact netdev mismatch. Bound-only programs normally have NULL offdevs, so\nunrelated netdevs compare equal. A bound-only program on an\noffload-registered netdev can instead inherit a real offdev and match a\nsibling port. With CAP_BPF and CAP_NET_ADMIN, a caller can use\nbpf(BPF_LINK_CREATE) with a different target ifindex to run metadata kfuncs\nspecialized for the bound driver on the target driver\u0027s xdp_buff. Running a\nveth-bound program on tun reads beyond tun\u0027s bare stack xdp_buff as a\nveth_xdp_buff.\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n  RIP: 0010:veth_xdp_rx_timestamp (drivers/net/veth.c:1673)\n  Call Trace:\n   ...\n   tun_build_skb (drivers/net/tun.c:1739)\n   tun_get_user (drivers/net/tun.c:1856)\n   tun_chr_write_iter (drivers/net/tun.c:2091)\n   vfs_write (fs/read_write.c:595 fs/read_write.c:687)\n   ksys_write (fs/read_write.c:739)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:84)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nRestrict non-offloaded programs to exact netdev matches and retain the\nshared-offdev fallback only for genuinely offloaded multi-port programs."
          }
        ],
        "id": "CVE-2026-98382",
        "lastModified": "2026-10-24T14:16:40.200",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "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"
              },
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-10-09T08:16:56.680",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e57f04194361574493e3e6cf0b9e9c69e4ae9791"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-24T14:27:31+00:00",
      "cve": "CVE-2026-98382",
      "id": "CVE-2026-98382",
      "initial_release_date": "2026-10-09T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Reject dev-bound-only programs on other devices",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98382.json",
      "version": "3"
    }
  }
}



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