CVE-2023-52928 (GCVE-0-2023-52928)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:37 – Updated: 2026-05-11 19:35
VLAI
Title
bpf: Skip invalid kfunc call in backtrack_insn
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Skip invalid kfunc call in backtrack_insn The verifier skips invalid kfunc call in check_kfunc_call(), which would be captured in fixup_kfunc_call() if such insn is not eliminated by dead code elimination. However, this can lead to the following warning in backtrack_insn(), also see [1]: ------------[ cut here ]------------ verifier backtracking bug WARNING: CPU: 6 PID: 8646 at kernel/bpf/verifier.c:2756 backtrack_insn kernel/bpf/verifier.c:2756 __mark_chain_precision kernel/bpf/verifier.c:3065 mark_chain_precision kernel/bpf/verifier.c:3165 adjust_reg_min_max_vals kernel/bpf/verifier.c:10715 check_alu_op kernel/bpf/verifier.c:10928 do_check kernel/bpf/verifier.c:13821 [inline] do_check_common kernel/bpf/verifier.c:16289 [...] So make backtracking conservative with this by returning ENOTSUPP. [1] https://lore.kernel.org/bpf/CACkBjsaXNceR8ZjkLG=dT3P=4A8SBsg0Z5h5PWLryF5=ghKq=g@mail.gmail.com/
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e6ac2450d6dee3121cd8bbf2907b78a68a8a353d , < 6e2fac197de2c4c041bdd8982cffb104689113f1 (git)
Affected: e6ac2450d6dee3121cd8bbf2907b78a68a8a353d , < 74eec8266f37aff609db6a2f2b093e56a11c28c4 (git)
Affected: e6ac2450d6dee3121cd8bbf2907b78a68a8a353d , < d3178e8a434b58678d99257c0387810a24042fb6 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.93 , ≤ 5.15.* (semver)
Unaffected: 6.1.11 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Omite llamada kfunc no v\u00e1lida en backtrack_insn El verificador omite llamada kfunc no v\u00e1lida en check_kfunc_call(), que se capturar\u00eda en fixup_kfunc_call() si dicha insn no se elimina mediante la eliminaci\u00f3n de c\u00f3digo muerto. Sin embargo, esto puede generar la siguiente advertencia en backtrack_insn(), vea tambi\u00e9n [1]: ------------[ cortar aqu\u00ed ]------------ error de retroceso del verificador ADVERTENCIA: CPU: 6 PID: 8646 en kernel/bpf/verifier.c:2756 backtrack_insn kernel/bpf/verifier.c:2756 __mark_chain_precision kernel/bpf/verifier.c:3065 mark_chain_precision kernel/bpf/verifier.c:3165 adjust_reg_min_max_vals kernel/bpf/verifier.c:10715 check_alu_op kernel/bpf/verifier.c:10928 do_check kernel/bpf/verifier.c:13821 [en l\u00ednea] do_check_common kernel/bpf/verifier.c:16289 [...] As\u00ed que haga que el retroceso sea conservador con esto devolviendo ENOTSUPP. [1] https://lore.kernel.org/bpf/CACkBjsaXNceR8ZjkLG=dT3P=4A8SBsg0Z5h5PWLryF5=ghKq=g@mail.gmail.com/"
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        "id": "CVE-2023-52928",
        "lastModified": "2026-06-17T06:43:57.280",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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                "version": "3.1"
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              "source": "nvd@nist.gov",
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        "published": "2025-03-27T17:15:42.230",
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        "vulnStatus": "Analyzed",
        "weaknesses": [
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T19:10:57+00:00",
      "cve": "CVE-2023-52928",
      "id": "CVE-2023-52928",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Skip invalid kfunc call in backtrack_insn",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-52928.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:10:54Z",
      "cve": "CVE-2023-52928",
      "id": "CVE-2023-52928",
      "initial_release_date": "2025-03-28T03:39:02Z",
      "product_status:known_affected": "369",
      "product_status:known_not_affected": "399",
      "product_status:recommended": "124",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-52928",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-52928.json",
      "version": "21"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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.



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