{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "287d506d4e0865918cec82bb1361f283a08c979b"
            },
            {
              "fixed": "43e10709b1ba288bcbabb9b9cb6e518b2a5d8506"
            },
            {
              "fixed": "49ce92d207820f588b0406add82f053decfbe5d9"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80628.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: oss: Serialize readq reset state with q-\u003elock\n\nsnd_seq_oss_readq_clear() resets qlen, head, and tail without\nq-\u003elock 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-\u003elock 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-\u003elock 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-\u003emidi_sleep.\n4. Without q-\u003elock, 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 -\u003e 0x00000000",
  "id": "CVE-2026-80628",
  "modified": "2026-08-31T03:30:58.983042598Z",
  "published": "2026-08-28T06:48:45.377Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/287d506d4e0865918cec82bb1361f283a08c979b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43e10709b1ba288bcbabb9b9cb6e518b2a5d8506"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49ce92d207820f588b0406add82f053decfbe5d9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80628.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80628"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ALSA: seq: oss: Serialize readq reset state with q-\u003elock"
}