CVE-2025-39691 (GCVE-0-2025-39691)
Vulnerability from cvelistv5
Published
2025-09-05 17:20
Modified
2025-09-29 05:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/buffer: fix use-after-free when call bh_read() helper There's issue as follows: BUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110 Read of size 8 at addr ffffc9000168f7f8 by task swapper/3/0 CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.16.0-862.14.0.6.x86_64 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Call Trace: <IRQ> dump_stack_lvl+0x55/0x70 print_address_description.constprop.0+0x2c/0x390 print_report+0xb4/0x270 kasan_report+0xb8/0xf0 end_buffer_read_sync+0xe3/0x110 end_bio_bh_io_sync+0x56/0x80 blk_update_request+0x30a/0x720 scsi_end_request+0x51/0x2b0 scsi_io_completion+0xe3/0x480 ? scsi_device_unbusy+0x11e/0x160 blk_complete_reqs+0x7b/0x90 handle_softirqs+0xef/0x370 irq_exit_rcu+0xa5/0xd0 sysvec_apic_timer_interrupt+0x6e/0x90 </IRQ> Above issue happens when do ntfs3 filesystem mount, issue may happens as follows: mount IRQ ntfs_fill_super read_cache_page do_read_cache_folio filemap_read_folio mpage_read_folio do_mpage_readpage ntfs_get_block_vbo bh_read submit_bh wait_on_buffer(bh); blk_complete_reqs scsi_io_completion scsi_end_request blk_update_request end_bio_bh_io_sync end_buffer_read_sync __end_buffer_read_notouch unlock_buffer wait_on_buffer(bh);--> return will return to caller put_bh --> trigger stack-out-of-bounds In the mpage_read_folio() function, the stack variable 'map_bh' is passed to ntfs_get_block_vbo(). Once unlock_buffer() unlocks and wait_on_buffer() returns to continue processing, the stack variable is likely to be reclaimed. Consequently, during the end_buffer_read_sync() process, calling put_bh() may result in stack overrun. If the bh is not allocated on the stack, it belongs to a folio. Freeing a buffer head which belongs to a folio is done by drop_buffers() which will fail to free buffers which are still locked. So it is safe to call put_bh() before __end_buffer_read_notouch().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03b40bf5d0389ca23ae6857ee25789f0e0b47ce8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/042cf48ecf67f72c8b3846c7fac678f472712ff3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3169edb8945c295cf89120fc6b2c35cfe3ad4c9e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70a09115da586bf662c3bae9c0c4a1b99251fad9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90b5193edb323fefbee0e4e5bc39ed89dcc37719
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c58c6b532b7b69537cfd9ef701c7e37cdcf79dc4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c5aa6ba1127307ab5dc3773eaf40d73a3423841f
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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   Linux Linux Version: 2.6.12
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{
  "containers": {
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          "programFiles": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/buffer: fix use-after-free when call bh_read() helper\n\nThere\u0027s issue as follows:\nBUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110\nRead of size 8 at addr ffffc9000168f7f8 by task swapper/3/0\nCPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.16.0-862.14.0.6.x86_64\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nCall Trace:\n \u003cIRQ\u003e\n dump_stack_lvl+0x55/0x70\n print_address_description.constprop.0+0x2c/0x390\n print_report+0xb4/0x270\n kasan_report+0xb8/0xf0\n end_buffer_read_sync+0xe3/0x110\n end_bio_bh_io_sync+0x56/0x80\n blk_update_request+0x30a/0x720\n scsi_end_request+0x51/0x2b0\n scsi_io_completion+0xe3/0x480\n ? scsi_device_unbusy+0x11e/0x160\n blk_complete_reqs+0x7b/0x90\n handle_softirqs+0xef/0x370\n irq_exit_rcu+0xa5/0xd0\n sysvec_apic_timer_interrupt+0x6e/0x90\n \u003c/IRQ\u003e\n\n Above issue happens when do ntfs3 filesystem mount, issue may happens\n as follows:\n           mount                            IRQ\nntfs_fill_super\n  read_cache_page\n    do_read_cache_folio\n      filemap_read_folio\n        mpage_read_folio\n\t do_mpage_readpage\n\t  ntfs_get_block_vbo\n\t   bh_read\n\t     submit_bh\n\t     wait_on_buffer(bh);\n\t                            blk_complete_reqs\n\t\t\t\t     scsi_io_completion\n\t\t\t\t      scsi_end_request\n\t\t\t\t       blk_update_request\n\t\t\t\t        end_bio_bh_io_sync\n\t\t\t\t\t end_buffer_read_sync\n\t\t\t\t\t  __end_buffer_read_notouch\n\t\t\t\t\t   unlock_buffer\n\n            wait_on_buffer(bh);--\u003e return will return to caller\n\n\t\t\t\t\t  put_bh\n\t\t\t\t\t    --\u003e trigger stack-out-of-bounds\nIn the mpage_read_folio() function, the stack variable \u0027map_bh\u0027 is\npassed to ntfs_get_block_vbo(). Once unlock_buffer() unlocks and\nwait_on_buffer() returns to continue processing, the stack variable\nis likely to be reclaimed. Consequently, during the end_buffer_read_sync()\nprocess, calling put_bh() may result in stack overrun.\n\nIf the bh is not allocated on the stack, it belongs to a folio.  Freeing\na buffer head which belongs to a folio is done by drop_buffers() which\nwill fail to free buffers which are still locked.  So it is safe to call\nput_bh() before __end_buffer_read_notouch()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:57:29.874Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/70a09115da586bf662c3bae9c0c4a1b99251fad9"
        },
        {
          "url": "https://git.kernel.org/stable/c/3169edb8945c295cf89120fc6b2c35cfe3ad4c9e"
        },
        {
          "url": "https://git.kernel.org/stable/c/03b40bf5d0389ca23ae6857ee25789f0e0b47ce8"
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        },
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          "url": "https://git.kernel.org/stable/c/90b5193edb323fefbee0e4e5bc39ed89dcc37719"
        },
        {
          "url": "https://git.kernel.org/stable/c/7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49"
        }
      ],
      "title": "fs/buffer: fix use-after-free when call bh_read() helper",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39691",
    "datePublished": "2025-09-05T17:20:57.247Z",
    "dateReserved": "2025-04-16T07:20:57.113Z",
    "dateUpdated": "2025-09-29T05:57:29.874Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39691\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:45.840\",\"lastModified\":\"2025-09-08T16:25:38.810\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/buffer: fix use-after-free when call bh_read() helper\\n\\nThere\u0027s issue as follows:\\nBUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110\\nRead of size 8 at addr ffffc9000168f7f8 by task swapper/3/0\\nCPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.16.0-862.14.0.6.x86_64\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\\nCall Trace:\\n \u003cIRQ\u003e\\n dump_stack_lvl+0x55/0x70\\n print_address_description.constprop.0+0x2c/0x390\\n print_report+0xb4/0x270\\n kasan_report+0xb8/0xf0\\n end_buffer_read_sync+0xe3/0x110\\n end_bio_bh_io_sync+0x56/0x80\\n blk_update_request+0x30a/0x720\\n scsi_end_request+0x51/0x2b0\\n scsi_io_completion+0xe3/0x480\\n ? scsi_device_unbusy+0x11e/0x160\\n blk_complete_reqs+0x7b/0x90\\n handle_softirqs+0xef/0x370\\n irq_exit_rcu+0xa5/0xd0\\n sysvec_apic_timer_interrupt+0x6e/0x90\\n \u003c/IRQ\u003e\\n\\n Above issue happens when do ntfs3 filesystem mount, issue may happens\\n as follows:\\n           mount                            IRQ\\nntfs_fill_super\\n  read_cache_page\\n    do_read_cache_folio\\n      filemap_read_folio\\n        mpage_read_folio\\n\\t do_mpage_readpage\\n\\t  ntfs_get_block_vbo\\n\\t   bh_read\\n\\t     submit_bh\\n\\t     wait_on_buffer(bh);\\n\\t                            blk_complete_reqs\\n\\t\\t\\t\\t     scsi_io_completion\\n\\t\\t\\t\\t      scsi_end_request\\n\\t\\t\\t\\t       blk_update_request\\n\\t\\t\\t\\t        end_bio_bh_io_sync\\n\\t\\t\\t\\t\\t end_buffer_read_sync\\n\\t\\t\\t\\t\\t  __end_buffer_read_notouch\\n\\t\\t\\t\\t\\t   unlock_buffer\\n\\n            wait_on_buffer(bh);--\u003e return will return to caller\\n\\n\\t\\t\\t\\t\\t  put_bh\\n\\t\\t\\t\\t\\t    --\u003e trigger stack-out-of-bounds\\nIn the mpage_read_folio() function, the stack variable \u0027map_bh\u0027 is\\npassed to ntfs_get_block_vbo(). Once unlock_buffer() unlocks and\\nwait_on_buffer() returns to continue processing, the stack variable\\nis likely to be reclaimed. Consequently, during the end_buffer_read_sync()\\nprocess, calling put_bh() may result in stack overrun.\\n\\nIf the bh is not allocated on the stack, it belongs to a folio.  Freeing\\na buffer head which belongs to a folio is done by drop_buffers() which\\nwill fail to free buffers which are still locked.  So it is safe to call\\nput_bh() before __end_buffer_read_notouch().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03b40bf5d0389ca23ae6857ee25789f0e0b47ce8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/042cf48ecf67f72c8b3846c7fac678f472712ff3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3169edb8945c295cf89120fc6b2c35cfe3ad4c9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/70a09115da586bf662c3bae9c0c4a1b99251fad9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/90b5193edb323fefbee0e4e5bc39ed89dcc37719\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c58c6b532b7b69537cfd9ef701c7e37cdcf79dc4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5aa6ba1127307ab5dc3773eaf40d73a3423841f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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