{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990"
            },
            {
              "fixed": "26662bc8fced1d668fa1aa146eda085bfc67bd0b"
            },
            {
              "fixed": "6b524e6b234e45c7f5f90d13b042c6f57f80105c"
            },
            {
              "fixed": "597f279b7b4a06412e3d965e98cc36e181cdbede"
            },
            {
              "fixed": "22709117d9ae95e52673685f98caac7c356a8227"
            },
            {
              "fixed": "ad7e10c7ea89af45ac1bf1814855d45da472703d"
            },
            {
              "fixed": "5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f"
            },
            {
              "fixed": "5e6e2a18c20e88167d414f666032792e8bf19b80"
            },
            {
              "fixed": "f27bdc43077e4fcb5557dfc315ee8d91e741f483"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.5.0"
            },
            {
              "fixed": "5.10.266"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.217"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.184"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.153"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.105"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.45"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74601.json"
  },
  "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-\u003ebuffers[cpu];       // cpu_buffer_a\n        rb_reserve_next_event\n            rb_start_commit // inc committing\n            if (unlikely(READ_ONCE(cpu_buffer-\u003ebuffer) != buffer)) {...}\n            __rb_reserve_next\n                rb_move_tail\n                    rb_end_commit(cpu_buffer);   // dec committing =\u003e 0\n                    /* interrupt hits here, successfully swaps! */\n                    local_inc(\u0026cpu_buffer-\u003ecommitting);\n\n    ring_buffer_unlock_commit\n        cpu_buffer = buffer-\u003ebuffers[cpu];      // cpu_buffer_b\n        rb_commit\n            rb_end_commit\n            RB_WARN_ON(cpu_buffer, !local_read(\u0026cpu_buffer-\u003ecommitting))\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.",
  "id": "CVE-2026-74601",
  "modified": "2026-08-25T03:51:25.221003457Z",
  "published": "2026-08-22T15:31:50.092Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22709117d9ae95e52673685f98caac7c356a8227"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26662bc8fced1d668fa1aa146eda085bfc67bd0b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/597f279b7b4a06412e3d965e98cc36e181cdbede"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e6e2a18c20e88167d414f666032792e8bf19b80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b524e6b234e45c7f5f90d13b042c6f57f80105c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad7e10c7ea89af45ac1bf1814855d45da472703d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f27bdc43077e4fcb5557dfc315ee8d91e741f483"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74601.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74601"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ring-buffer: Use current_context for safe per-CPU buffer swap"
}