CVE-2025-40147 (GCVE-0-2025-40147)
Vulnerability from cvelistv5
Published
2025-11-12 10:23
Modified
2025-11-12 10:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-throttle: fix access race during throttle policy activation On repeated cold boots we occasionally hit a NULL pointer crash in blk_should_throtl() when throttling is consulted before the throttle policy is fully enabled for the queue. Checking only q->td != NULL is insufficient during early initialization, so blkg_to_pd() for the throttle policy can still return NULL and blkg_to_tg() becomes NULL, which later gets dereferenced. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000156 ... pc : submit_bio_noacct+0x14c/0x4c8 lr : submit_bio_noacct+0x48/0x4c8 sp : ffff800087f0b690 x29: ffff800087f0b690 x28: 0000000000005f90 x27: ffff00068af393c0 x26: 0000000000080000 x25: 000000000002fbc0 x24: ffff000684ddcc70 x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000000000 x20: 0000000000080000 x19: ffff000684ddcd08 x18: ffffffffffffffff x17: 0000000000000000 x16: ffff80008132a550 x15: 0000ffff98020fff x14: 0000000000000000 x13: 1fffe000d11d7021 x12: ffff000688eb810c x11: ffff00077ec4bb80 x10: ffff000688dcb720 x9 : ffff80008068ef60 x8 : 00000a6fb8a86e85 x7 : 000000000000111e x6 : 0000000000000002 x5 : 0000000000000246 x4 : 0000000000015cff x3 : 0000000000394500 x2 : ffff000682e35e40 x1 : 0000000000364940 x0 : 000000000000001a Call trace: submit_bio_noacct+0x14c/0x4c8 verity_map+0x178/0x2c8 __map_bio+0x228/0x250 dm_submit_bio+0x1c4/0x678 __submit_bio+0x170/0x230 submit_bio_noacct_nocheck+0x16c/0x388 submit_bio_noacct+0x16c/0x4c8 submit_bio+0xb4/0x210 f2fs_submit_read_bio+0x4c/0xf0 f2fs_mpage_readpages+0x3b0/0x5f0 f2fs_readahead+0x90/0xe8 Tighten blk_throtl_activated() to also require that the throttle policy bit is set on the queue: return q->td != NULL && test_bit(blkcg_policy_throtl.plid, q->blkcg_pols); This prevents blk_should_throtl() from accessing throttle group state until policy data has been attached to blkgs.
References
Impacted products
Vendor Product Version
Linux Linux Version: a3166c51702bb00b8f8b84022090cbab8f37be1a
Version: a3166c51702bb00b8f8b84022090cbab8f37be1a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c",
            "block/blk-cgroup.h",
            "block/blk-throttle.c",
            "block/blk-throttle.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6a0c394300a7b0c05504596685de8a46707171fc",
              "status": "affected",
              "version": "a3166c51702bb00b8f8b84022090cbab8f37be1a",
              "versionType": "git"
            },
            {
              "lessThan": "bd9fd5be6bc0836820500f68fff144609fbd85a9",
              "status": "affected",
              "version": "a3166c51702bb00b8f8b84022090cbab8f37be1a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c",
            "block/blk-cgroup.h",
            "block/blk-throttle.c",
            "block/blk-throttle.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18-rc1",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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-\u003etd != 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-\u003etd != NULL \u0026\u0026\n         test_bit(blkcg_policy_throtl.plid, q-\u003eblkcg_pols);\n\nThis prevents blk_should_throtl() from accessing throttle group state\nuntil policy data has been attached to blkgs."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-12T10:23:26.556Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6a0c394300a7b0c05504596685de8a46707171fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd9fd5be6bc0836820500f68fff144609fbd85a9"
        }
      ],
      "title": "blk-throttle: fix access race during throttle policy activation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40147",
    "datePublished": "2025-11-12T10:23:26.556Z",
    "dateReserved": "2025-04-16T07:20:57.175Z",
    "dateUpdated": "2025-11-12T10:23:26.556Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40147\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T11:15:44.600\",\"lastModified\":\"2025-11-12T16:19:12.850\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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-\u003etd != 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-\u003etd != NULL \u0026\u0026\\n         test_bit(blkcg_policy_throtl.plid, q-\u003eblkcg_pols);\\n\\nThis prevents blk_should_throtl() from accessing throttle group state\\nuntil policy data has been attached to blkgs.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6a0c394300a7b0c05504596685de8a46707171fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd9fd5be6bc0836820500f68fff144609fbd85a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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