CVE-2026-53078 (GCVE-0-2026-53078)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-08-05 12:33
VLAI
Title
bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fd09af010788a884de1c39537c288830c3d305db , < 2a2c98141e0a75f2d4a7d78b0316c88b3da784ac (git)
Affected: fd09af010788a884de1c39537c288830c3d305db , < 22400725de070b787cd6d806c5795370ab46d269 (git)
Affected: fd09af010788a884de1c39537c288830c3d305db , < 18e3ffde1822f0b48b1753bf34aa97ce839df1d8 (git)
Affected: fd09af010788a884de1c39537c288830c3d305db , < 10f86a2a5c91fc4c4d001960f1c21abe52545ef6 (git)
Affected: 48be3df15aa19c04eadf156c9129293c9a10389f (git)
Affected: cd4644d904e1d153d516e73e2e127e7a2fe687e1 (git)
Affected: 6e0bc946cbeec538322820786b5fb5200a2216ab (git)
Affected: a7e52f7f675046d9ffc5692d815fa67c82fcdbf5 (git)
Affected: db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef (git)
Affected: 5.7.18 , < 5.8 (semver)
Affected: 5.8.4 , < 5.9 (semver)
Affected: 5.4.61 , < 5.5 (semver)
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Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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."
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-03T11:05:52+00:00",
      "cve": "CVE-2026-53078",
      "id": "CVE-2026-53078",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53078.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.