CVE-2025-39691High· 7.8▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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().
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 70a09115da586bf662c3bae9c0c4a1b99251fad9Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3169edb8945c295cf89120fc6b2c35cfe3ad4c9eLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 03b40bf5d0389ca23ae6857ee25789f0e0b47ce8Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c58c6b532b7b69537cfd9ef701c7e37cdcf79dc4Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c5aa6ba1127307ab5dc3773eaf40d73a3423841fLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 042cf48ecf67f72c8b3846c7fac678f472712ff3Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 90b5193edb323fefbee0e4e5bc39ed89dcc37719Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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