{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53078",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53078"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix same-register dst/src OOB read and pointer leak in sock_ops\n\nWhen a BPF sock_ops program accesses ctx fields with dst_reg == src_reg,\nthe SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the\ndestination register in the !fullsock / !locked_tcp_sock path.\n\nBoth macros borrow a temporary register to check is_fullsock /\nis_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the\nctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with\na request_sock), dst_reg should be zeroed but is not, leaving the stale\nctx pointer:\n\n - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks\n   as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer,\n   leading to stack-out-of-bounds access in helpers like\n   bpf_skc_to_tcp6_sock().\n\n - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the\n   verifier believes is a SCALAR_VALUE, leaking a kernel pointer.\n\nFix both macros by:\n - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the\n   added instruction.\n - Adding BPF_MOV64_IMM(si->dst_reg, 0) after the temp register\n   restore in the !fullsock path, placed after the restore because\n   dst_reg == src_reg means we need src_reg intact to read ctx->temp.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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          "1:6.12.75-1+rpt1": {
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          "1:6.18.29-1+rpt1": {
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            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
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          "1:6.18.33-1+rpt1": {
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            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
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          "1:6.18.34-1+rpt1": {
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            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
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          "1:6.18.39-1+rpt1": {
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            "upstream_fixed": "6.18.42"
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53078"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db1200ec2c3ddf119d4d9ba67982063df06bbacb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c1c5efd9d1d74743d41ce4e1600501b4feb6827"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e6b30657bbc771f38025c828d722b6162428508"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64eaf4ecda007140ddcdb28e00c48c9c69aaba39"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2a2c98141e0a75f2d4a7d78b0316c88b3da784ac"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/22400725de070b787cd6d806c5795370ab46d269"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires loading and attaching a crafted BPF_PROG_TYPE_SOCK_OPS program through the local bpf() interface. Remote TCP traffic can trigger an attached program, but cannot by itself create the malicious program.\nAC:L - The attacker controls the BPF bytecode pattern and can reliably trigger non-fullsock/request_sock sock_ops callbacks with local TCP activity. No uncontrolled race or rare runtime condition is required.\nPR:L - Loading/attaching sock_ops BPF requires BPF and net-admin style privileges, but these can be available to a local user through user-namespace/BPF-token delegation in plausible deployments. Under the required overestimate rule this is Low rather than High.\nUI:N - No victim action is needed after the attacker loads and attaches the crafted sock_ops program. The attacker can trigger the callback path directly.\nS:U - The impact is within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug leaks a kernel context pointer as a scalar and lets it be used as a bogus socket pointer. Helper dereferences can perform kernel stack out-of-bounds reads, so confidentiality impact is High.\nI:H - The bogus verifier-approved socket pointer can reach helpers that mutate socket-associated state, creating plausible kernel memory corruption from a misinterpreted stack object. With uncertainty required to resolve upward, integrity impact is High.\nA:H - The same bogus pointer path can cause kernel stack out-of-bounds accesses and invalid helper dereferences. These can crash or panic the kernel, so availability impact is High."
    }
  }
}