{"id":"DEBIAN-CVE-2026-43232","details":"In the Linux kernel, the following vulnerability has been resolved:  net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets  When the FarSync T-series card is being detached, the fst_card_info is deallocated in fst_remove_one(). However, the fst_tx_task or fst_int_task may still be running or pending, leading to use-after-free bugs when the already freed fst_card_info is accessed in fst_process_tx_work_q() or fst_process_int_work_q().  A typical race condition is depicted below:  CPU 0 (cleanup)           | CPU 1 (tasklet)                           | fst_start_xmit() fst_remove_one()          |   tasklet_schedule()   unregister_hdlc_device()|                           | fst_process_tx_work_q() //handler   kfree(card) //free      |   do_bottom_half_tx()                           |     card-\u003e //use  The following KASAN trace was captured:  ==================================================================  BUG: KASAN: slab-use-after-free in do_bottom_half_tx+0xb88/0xd00  Read of size 4 at addr ffff88800aad101c by task ksoftirqd/3/32  ...  Call Trace:   \u003cIRQ\u003e   dump_stack_lvl+0x55/0x70   print_report+0xcb/0x5d0   ? do_bottom_half_tx+0xb88/0xd00   kasan_report+0xb8/0xf0   ? do_bottom_half_tx+0xb88/0xd00   do_bottom_half_tx+0xb88/0xd00   ? _raw_spin_lock_irqsave+0x85/0xe0   ? __pfx__raw_spin_lock_irqsave+0x10/0x10   ? __pfx___hrtimer_run_queues+0x10/0x10   fst_process_tx_work_q+0x67/0x90   tasklet_action_common+0x1fa/0x720   ? hrtimer_interrupt+0x31f/0x780   handle_softirqs+0x176/0x530   __irq_exit_rcu+0xab/0xe0   sysvec_apic_timer_interrupt+0x70/0x80  ...   Allocated by task 41 on cpu 3 at 72.330843s:   kasan_save_stack+0x24/0x50   kasan_save_track+0x17/0x60   __kasan_kmalloc+0x7f/0x90   fst_add_one+0x1a5/0x1cd0   local_pci_probe+0xdd/0x190   pci_device_probe+0x341/0x480   really_probe+0x1c6/0x6a0   __driver_probe_device+0x248/0x310   driver_probe_device+0x48/0x210   __device_attach_driver+0x160/0x320   bus_for_each_drv+0x101/0x190   __device_attach+0x198/0x3a0   device_initial_probe+0x78/0xa0   pci_bus_add_device+0x81/0xc0   pci_bus_add_devices+0x7e/0x190   enable_slot+0x9b9/0x1130   acpiphp_check_bridge.part.0+0x2e1/0x460   acpiphp_hotplug_notify+0x36c/0x3c0   acpi_device_hotplug+0x203/0xb10   acpi_hotplug_work_fn+0x59/0x80  ...   Freed by task 41 on cpu 1 at 75.138639s:   kasan_save_stack+0x24/0x50   kasan_save_track+0x17/0x60   kasan_save_free_info+0x3b/0x60   __kasan_slab_free+0x43/0x70   kfree+0x135/0x410   fst_remove_one+0x2ca/0x540   pci_device_remove+0xa6/0x1d0   device_release_driver_internal+0x364/0x530   pci_stop_bus_device+0x105/0x150   pci_stop_and_remove_bus_device+0xd/0x20   disable_slot+0x116/0x260   acpiphp_disable_and_eject_slot+0x4b/0x190   acpiphp_hotplug_notify+0x230/0x3c0   acpi_device_hotplug+0x203/0xb10   acpi_hotplug_work_fn+0x59/0x80  ...   The buggy address belongs to the object at ffff88800aad1000   which belongs to the cache kmalloc-1k of size 1024  The buggy address is located 28 bytes inside of   freed 1024-byte region  The buggy address belongs to the physical page:  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xaad0  head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0  flags: 0x100000000000040(head|node=0|zone=1)  page_type: f5(slab)  raw: 0100000000000040 ffff888007042dc0 dead000000000122 0000000000000000  raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000  head: 0100000000000040 ffff888007042dc0 dead000000000122 0000000000000000  head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000  head: 0100000000000003 ffffea00002ab401 00000000ffffffff 00000000ffffffff  head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000  page dumped because: kasan: bad access detected   Memory state around the buggy address:   ffff88800aad0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc   ffff88800aad0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc  \u003effff88800aad1000: fa fb ---truncated---","modified":"2026-09-01T16:06:43.568600561Z","published":"2026-05-06T12:16:43.223Z","upstream":["CVE-2026-43232"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-43232"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.170-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43232.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.85-1"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43232.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.19.6-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43232.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}