{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80628",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-80628"
  ],
  "published": "2026-08-28T06:50:33Z",
  "summary": "ALSA: seq: oss: Serialize readq reset state with q->lock",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: oss: Serialize readq reset state with q->lock\n\nsnd_seq_oss_readq_clear() resets qlen, head, and tail without\nq->lock even though the normal reader and producer paths serialize the\nsame ring state under that spinlock. A reset can therefore race\nsnd_seq_oss_readq_free() or snd_seq_oss_readq_put_event() and leave\nstale records in the queue, drop freshly queued ones, or report the\nwrong readiness after wakeup. KCSAN reports a data race between\nsnd_seq_oss_readq_clear() and snd_seq_oss_readq_free().\n\nTake q->lock while clearing the ring and resetting input_time. Factor\nthe enqueue logic into a caller-locked helper so\nsnd_seq_oss_readq_put_timestamp() updates its suppression state under\nthe same lock instead of racing the reset path.\n\nThe buggy scenario involves two paths, with each column showing the\norder within that path:\n\nreset path:                      locked readq updater:\n1. snd_seq_oss_reset() or        1. A reader or callback producer\n   release reaches                  takes q->lock on the same queue.\n   snd_seq_oss_readq_clear().\n2. snd_seq_oss_readq_clear()     2. The updater tests or modifies\n   resets qlen, head, tail,         qlen, head, and tail.\n   and input_time.\n3. snd_seq_oss_readq_clear()     3. The updater completes its\n   wakes sleepers on                read-modify-write sequence.\n   q->midi_sleep.\n4. Without q->lock, the reset    4. The resulting ring state drives\n   can overlap the locked           later reads and readiness.\n   update.\n\nKCSAN reports:\n\nBUG: KCSAN: data-race in snd_seq_oss_readq_clear /\nsnd_seq_oss_readq_free\n\nwrite to 0xffff8881069fe608 of 4 bytes by task 120516 on cpu 0:\n  snd_seq_oss_readq_free+0x6c/0x80\n  snd_seq_oss_read+0xcb/0x250\n  odev_read+0x38/0x60\n  vfs_read+0xff/0x600\n  ksys_read+0xb4/0x140\n  __x64_sys_read+0x46/0x60\n  do_syscall_64+0xbb/0x2f0\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nread to 0xffff8881069fe608 of 4 bytes by task 120517 on cpu 1:\n  snd_seq_oss_readq_clear+0x1f/0x90\n  snd_seq_oss_reset+0xa7/0xf0\n  snd_seq_oss_ioctl+0x6f6/0x7e0\n  odev_ioctl+0x56/0xc0\n  __x64_sys_ioctl+0xd1/0x120\n  do_syscall_64+0xbb/0x2f0\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nvalue changed: 0x00000001 -> 0x00000000",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80628"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/287d506d4e0865918cec82bb1361f283a08c979b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/43e10709b1ba288bcbabb9b9cb6e518b2a5d8506"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/49ce92d207820f588b0406add82f053decfbe5d9"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-29T06:25:05Z"
  }
}