{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40147",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40147"
  ],
  "published": "2025-11-12T10:24:04Z",
  "summary": "blk-throttle: fix access race during throttle policy activation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-throttle: fix access race during throttle policy activation\n\nOn repeated cold boots we occasionally hit a NULL pointer crash in\nblk_should_throtl() when throttling is consulted before the throttle\npolicy is fully enabled for the queue. Checking only q->td != NULL is\ninsufficient during early initialization, so blkg_to_pd() for the\nthrottle policy can still return NULL and blkg_to_tg() becomes NULL,\nwhich later gets dereferenced.\n\n Unable to handle kernel NULL pointer dereference\n at virtual address 0000000000000156\n ...\n pc : submit_bio_noacct+0x14c/0x4c8\n lr : submit_bio_noacct+0x48/0x4c8\n sp : ffff800087f0b690\n x29: ffff800087f0b690 x28: 0000000000005f90 x27: ffff00068af393c0\n x26: 0000000000080000 x25: 000000000002fbc0 x24: ffff000684ddcc70\n x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000000000\n x20: 0000000000080000 x19: ffff000684ddcd08 x18: ffffffffffffffff\n x17: 0000000000000000 x16: ffff80008132a550 x15: 0000ffff98020fff\n x14: 0000000000000000 x13: 1fffe000d11d7021 x12: ffff000688eb810c\n x11: ffff00077ec4bb80 x10: ffff000688dcb720 x9 : ffff80008068ef60\n x8 : 00000a6fb8a86e85 x7 : 000000000000111e x6 : 0000000000000002\n x5 : 0000000000000246 x4 : 0000000000015cff x3 : 0000000000394500\n x2 : ffff000682e35e40 x1 : 0000000000364940 x0 : 000000000000001a\n Call trace:\n  submit_bio_noacct+0x14c/0x4c8\n  verity_map+0x178/0x2c8\n  __map_bio+0x228/0x250\n  dm_submit_bio+0x1c4/0x678\n  __submit_bio+0x170/0x230\n  submit_bio_noacct_nocheck+0x16c/0x388\n  submit_bio_noacct+0x16c/0x4c8\n  submit_bio+0xb4/0x210\n  f2fs_submit_read_bio+0x4c/0xf0\n  f2fs_mpage_readpages+0x3b0/0x5f0\n  f2fs_readahead+0x90/0xe8\n\nTighten blk_throtl_activated() to also require that the throttle policy\nbit is set on the queue:\n\n  return q->td != NULL &&\n         test_bit(blkcg_policy_throtl.plid, q->blkcg_pols);\n\nThis prevents blk_should_throtl() from accessing throttle group state\nuntil policy data has been attached to blkgs.",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40147"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7b4bfd02c934dbbb18814ed012ecb90b58db6935"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6a0c394300a7b0c05504596685de8a46707171fc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bd9fd5be6bc0836820500f68fff144609fbd85a9"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}