CVE-2025-38607 (GCVE-0-2025-38607)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2026-08-05 12:03
VLAI
Title
bpf: handle jset (if a & b ...) as a jump in CFG computation
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: handle jset (if a & b ...) as a jump in CFG computation BPF_JSET is a conditional jump and currently verifier.c:can_jump() does not know about that. This can lead to incorrect live registers and SCC computation. E.g. in the following example: 1: r0 = 1; 2: r2 = 2; 3: if r1 & 0x7 goto +1; 4: exit; 5: r0 = r2; 6: exit; W/o this fix insn_successors(3) will return only (4), a jump to (5) would be missed and r2 won't be marked as alive at (3).
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: 14c8552db64476ffc27c13dc6652fc0dac31c0ba , < 65eb166b8636365ad3d6e36d50a7c5edfe6cc66e (git)
Affected: 14c8552db64476ffc27c13dc6652fc0dac31c0ba , < 261b30ad1516f4b9edd500aa6e8d6315c8fc109a (git)
Affected: 14c8552db64476ffc27c13dc6652fc0dac31c0ba , < 3157f7e2999616ac91f4d559a8566214f74000a5 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: handle jset (if a \u0026 b ...) as a jump in CFG computation\n\nBPF_JSET is a conditional jump and currently verifier.c:can_jump()\ndoes not know about that. This can lead to incorrect live registers\nand SCC computation.\n\nE.g. in the following example:\n\n   1: r0 = 1;\n   2: r2 = 2;\n   3: if r1 \u0026 0x7 goto +1;\n   4: exit;\n   5: r0 = r2;\n   6: exit;\n\nW/o this fix insn_successors(3) will return only (4), a jump to (5)\nwould be missed and r2 won\u0027t be marked as alive at (3)."
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              "value": "AV:L - The vulnerable analysis runs inside the BPF verifier, reached only through the local `bpf(BPF_PROG_LOAD)` syscall with attacker-supplied bytecode. There is no network or remote-peer component in the path.\nAC:L - The attacker fully authors the instruction stream, so emitting a `BPF_JSET` prune point whose taken-branch registers are wrongly marked dead is entirely deterministic. No race, timing window, or uncontrollable memory-layout condition is involved.\nPR:L - With the upstream default `CONFIG_BPF_UNPRIV_DEFAULT_OFF=n` (`sysctl_unprivileged_bpf_disabled == 0`), any unprivileged local user can load a socket-filter program and reach `compute_live_registers()`/`func_states_equal()`; otherwise `CAP_BPF`, commonly held by container and observability workloads, is enough. No real root in the init namespace is required.\nUI:N - The attacker loads and triggers its own BPF program end-to-end via the bpf() syscall. No victim action or cooperation is needed.\nS:U - The impact is confinement failure within the kernel\u0027s own security authority \u2014 an unprivileged process gains kernel-level memory access on the same host. No VM, IOMMU, or hypervisor boundary is crossed.\nC:H - Unsound pruning at the JSET checkpoint lets an unverified attacker-controlled pointer/scalar be used for loads on the taken branch, yielding arbitrary kernel memory read and disclosure of KASLR bases, credentials, and keys. The parallel SCC/precision defect provides a second route to the same leak.\nI:H - The same skipped-register comparison permits an unverified value to reach a store, giving an out-of-bounds kernel write primitive \u2014 the standard eBPF verifier-bypass path to overwriting `struct cred` or kernel text pointers and achieving full privilege escalation. Missing precision back-propagation on JSET loops compounds this.\nA:H - A program accepted with unverified register state performs wild kernel reads and writes, reliably producing oops, corruption, or panic. Complete kernel compromise likewise implies full loss of availability."
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    "dateReserved": "2025-04-16T04:51:24.028Z",
    "dateUpdated": "2026-08-05T12:03:27.014Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: handle jset (if a \u0026 b ...) as a jump in CFG computation\n\nBPF_JSET is a conditional jump and currently verifier.c:can_jump()\ndoes not know about that. This can lead to incorrect live registers\nand SCC computation.\n\nE.g. in the following example:\n\n   1: r0 = 1;\n   2: r2 = 2;\n   3: if r1 \u0026 0x7 goto +1;\n   4: exit;\n   5: r0 = r2;\n   6: exit;\n\nW/o this fix insn_successors(3) will return only (4), a jump to (5)\nwould be missed and r2 won\u0027t be marked as alive at (3)."
          },
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: manejar jset (si a \u0026amp; b ...) como un salto en el c\u00e1lculo CFG. BPF_JSET es un salto condicional y actualmente verifier.c:can_jump() no lo detecta. Esto puede provocar registros activos y c\u00e1lculos SCC incorrectos. Por ejemplo, en el siguiente ejemplo: 1: r0 = 1; 2: r2 = 2; 3: si r1 \u0026amp; 0x7 goto +1; 4: salir; 5: r0 = r2; 6: salir; Sin esta correcci\u00f3n, insn_successors(3) solo devolver\u00e1 (4), se omitir\u00eda un salto a (5) y r2 no se marcar\u00eda como activo en (3)."
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        "lastModified": "2026-07-30T06:23:30.447",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: handle jset (if a \u0026#38; b ...) as a jump in CFG computation",
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      "cve": "CVE-2025-38607",
      "id": "CVE-2025-38607",
      "initial_release_date": "2025-08-19T23:22:58Z",
      "product_status:known_not_affected": "524",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38607",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38607.json",
      "version": "8"
    }
  }
}



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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.



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