{"id":"CVE-2025-39691","summary":"fs/buffer: fix use-after-free when call bh_read() helper","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/buffer: fix use-after-free when call bh_read() helper\n\nThere's 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 'map_bh' 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().","aliases":["ECHO-5133-1360-f1bb"],"modified":"2026-04-21T02:26:47.239684395Z","published":"2025-09-05T17:20:57.247Z","related":["SUSE-SU-2025:03600-1","SUSE-SU-2025:03601-1","SUSE-SU-2025:03602-1","SUSE-SU-2025:03614-1","SUSE-SU-2025:03615-1","SUSE-SU-2025:03628-1","SUSE-SU-2025:03633-1","SUSE-SU-2025:03634-1","SUSE-SU-2025:20851-1","SUSE-SU-2025:20861-1","SUSE-SU-2025:20870-1","SUSE-SU-2025:20898-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","SUSE-SU-2025:3716-1","SUSE-SU-2025:3725-1","SUSE-SU-2025:3751-1","SUSE-SU-2025:3761-1","openSUSE-SU-2025:20081-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39691.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03b40bf5d0389ca23ae6857ee25789f0e0b47ce8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/042cf48ecf67f72c8b3846c7fac678f472712ff3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3169edb8945c295cf89120fc6b2c35cfe3ad4c9e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70a09115da586bf662c3bae9c0c4a1b99251fad9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49"},{"type":"WEB","url":"https://git.kernel.org/stable/c/90b5193edb323fefbee0e4e5bc39ed89dcc37719"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c58c6b532b7b69537cfd9ef701c7e37cdcf79dc4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c5aa6ba1127307ab5dc3773eaf40d73a3423841f"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39691.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39691"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"70a09115da586bf662c3bae9c0c4a1b99251fad9"},{"fixed":"3169edb8945c295cf89120fc6b2c35cfe3ad4c9e"},{"fixed":"03b40bf5d0389ca23ae6857ee25789f0e0b47ce8"},{"fixed":"c58c6b532b7b69537cfd9ef701c7e37cdcf79dc4"},{"fixed":"c5aa6ba1127307ab5dc3773eaf40d73a3423841f"},{"fixed":"042cf48ecf67f72c8b3846c7fac678f472712ff3"},{"fixed":"90b5193edb323fefbee0e4e5bc39ed89dcc37719"},{"fixed":"7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39691.json"}}],"schema_version":"1.7.5"}