{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74601",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74601"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "ring-buffer: Use current_context for safe per-CPU buffer swap",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Use current_context for safe per-CPU buffer swap\n\nThe ring_buffer_swap_cpu() function currently checks the per-CPU\ncommitting counter to determine if a buffer is actively being written to\nbefore performing the swap. However, there exists a race window where\nthis check can be bypassed:\n\n    ring_buffer_lock_reserve\n        cpu_buffer = buffer->buffers[cpu];       // cpu_buffer_a\n        rb_reserve_next_event\n            rb_start_commit // inc committing\n            if (unlikely(READ_ONCE(cpu_buffer->buffer) != buffer)) {...}\n            __rb_reserve_next\n                rb_move_tail\n                    rb_end_commit(cpu_buffer);   // dec committing => 0\n                    /* interrupt hits here, successfully swaps! */\n                    local_inc(&cpu_buffer->committing);\n\n    ring_buffer_unlock_commit\n        cpu_buffer = buffer->buffers[cpu];      // cpu_buffer_b\n        rb_commit\n            rb_end_commit\n            RB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer->committing))\n                                                // triggers warning\n\nThe committing counter can temporarily drop to 0 during a single write\noperation (within rb_move_tail), creating a window where swap can\nsucceed even though the write is still in progress. This leads to\ninconsistent buffer state and triggers the RB_WARN_ON in rb_commit().\n\nReplace the committing counter check with current_context checks, which\nare set at the entry of ring_buffer_lock_reserve() and remain valid\nthroughout the entire write operation, providing a reliable indicator of\nbuffer busy state during swap.",
  "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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            "upstream_fixed": "6.12.105"
          },
          "1:6.12.75-1+rpt1": {
            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.105"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74601"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/26662bc8fced1d668fa1aa146eda085bfc67bd0b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6b524e6b234e45c7f5f90d13b042c6f57f80105c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/597f279b7b4a06412e3d965e98cc36e181cdbede"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/22709117d9ae95e52673685f98caac7c356a8227"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ad7e10c7ea89af45ac1bf1814855d45da472703d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5e6e2a18c20e88167d414f666032792e8bf19b80"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f27bdc43077e4fcb5557dfc315ee8d91e741f483"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local tracefs writes to snapshot or latency tracers; ring_buffer_swap_cpu() is only reached from update_max_tr_single() via tracing_snapshot_write or irqsoff/preemptoff tracers, with no network, adjacent, or physical entry path.\nAC:L - The attacker controls both sides of the race by enabling irqsoff/preemptoff tracing or hammering per_cpu/*/snapshot while generating trace events that cross page boundaries, reliably hitting the rb_move_tail window where committing briefly drops to zero.\nPR:L - tracing_check_open_get_tr() enforces only LOCKDOWN_TRACEFS and DAC with no capable() check; tracefs gid= mounts, Android/Perfetto/ChromeOS tracing groups, and container user+mount namespaces routinely grant unprivileged local write access to snapshot and current_tracer.\nUI:N - The attacker enables tracers and triggers buffer swaps through their own tracefs writes and syscalls; no victim cooperation, unrelated user action, or third-party interaction is required.\nS:U - Impact is corrupted kernel ring-buffer metadata and WARN_ON within the same kernel security domain; this is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Swapping per-CPU buffers mid-write leaves ring_buffer_per_cpu page, tail, and commit state inconsistent across buffers; subsequent trace reads or commits can access wrong backing pages, constituting kernel-memory corruption with arbitrary-read potential.\nI:H - Mid-reservation buffer swap causes unlock_commit on the wrong cpu_buffer with mismatched tail/commit page pointers, corrupting ring-buffer page lists and write metadata in ways exploitable for heap corruption and control-flow manipulation.\nA:H - rb_end_commit() hits RB_WARN_ON triggering WARN_ON and disabling recording; corrupted ring-buffer page state from this swap race has caused kernel oops/panic in related ring_buffer_swap_cpu bugs, and panic_on_warn makes the WARN fatal."
    }
  }
}