{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.176-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.94-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.10-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  dm cache: fix null-deref with concurrent writes in passthrough mode  In passthrough mode, when dm-cache starts to invalidate a cache entry and bio prison cell lock fails due to concurrent write to the same cached block, mg-\u003ecell remains NULL. The error path in invalidate_complete() attempts to unlock and free the cell unconditionally, causing a NULL pointer dereference:  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 134 Comm: fio Not tainted 6.19.0-rc7 #3 PREEMPT RIP: 0010:dm_cell_unlock_v2+0x3f/0x210 \u003csnip\u003e Call Trace:  invalidate_complete+0xef/0x430  map_bio+0x130f/0x1a10  cache_map+0x320/0x6b0  __map_bio+0x458/0x510  dm_submit_bio+0x40e/0x16d0  __submit_bio+0x419/0x870 \u003csnip\u003e  Reproduce steps:  1. Create a cache device  dmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\" dmsetup create cdata --table \"0 131072 linear /dev/sdc 8192\" dmsetup create corig --table \"0 262144 linear /dev/sdc 262144\" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct dmsetup create cache --table \"0 262144 cache /dev/mapper/cmeta \\ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"  2. Promote the first data block into cache  fio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \\ --direct=1 --size=64k  3. Reload the cache into passthrough mode  dmsetup suspend cache dmsetup reload cache --table \"0 262144 cache /dev/mapper/cmeta \\ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0\" dmsetup resume cache  4. Write to the first cached block concurrently  fio --filename=/dev/mapper/cache --name test --rw=randwrite --bs=4k \\ --randrepeat=0 --direct=1 --numjobs=2 --size 64k  Fix by checking if mg-\u003ecell is valid before attempting to unlock it.",
  "id": "DEBIAN-CVE-2026-53064",
  "modified": "2026-09-14T16:47:33.729562324Z",
  "published": "2026-06-24T17:17:19.320Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-53064"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-53064"
  ]
}