FKIE_CVE-2026-53078

Vulnerability from fkie_nvd - Published: 2026-06-24 17:17 - Updated: 2026-09-14 12:17
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops When a BPF sock_ops program accesses ctx fields with dst_reg == src_reg, the SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the destination register in the !fullsock / !locked_tcp_sock path. Both macros borrow a temporary register to check is_fullsock / is_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the ctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with a request_sock), dst_reg should be zeroed but is not, leaving the stale ctx pointer: - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer, leading to stack-out-of-bounds access in helpers like bpf_skc_to_tcp6_sock(). - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the verifier believes is a SCALAR_VALUE, leaking a kernel pointer. Fix both macros by: - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the added instruction. - Adding BPF_MOV64_IMM(si->dst_reg, 0) after the temp register restore in the !fullsock path, placed after the restore because dst_reg == src_reg means we need src_reg intact to read ctx->temp.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e6b30657bbc771f38025c828d722b6162428508
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22400725de070b787cd6d806c5795370ab46d269
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a2c98141e0a75f2d4a7d78b0316c88b3da784ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c1c5efd9d1d74743d41ce4e1600501b4feb6827
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64eaf4ecda007140ddcdb28e00c48c9c69aaba39
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db1200ec2c3ddf119d4d9ba67982063df06bbacb
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.9
linux linux_kernel 5.9
linux linux_kernel 5.9
linux linux_kernel 5.9
linux linux_kernel 5.9
linux linux_kernel 5.9
linux linux_kernel 5.9
linux linux_kernel 5.9
To clipboard 

{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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-\u003edst_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-\u003etemp."
    }
  ],
  "id": "CVE-2026-53078",
  "lastModified": "2026-09-14T12:17:43.033",
  "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-06-24T17:17:21.850",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0e6b30657bbc771f38025c828d722b6162428508"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/22400725de070b787cd6d806c5795370ab46d269"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2a2c98141e0a75f2d4a7d78b0316c88b3da784ac"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4c1c5efd9d1d74743d41ce4e1600501b4feb6827"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64eaf4ecda007140ddcdb28e00c48c9c69aaba39"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db1200ec2c3ddf119d4d9ba67982063df06bbacb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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