{"id":"DEBIAN-CVE-2022-50773","details":"In the Linux kernel, the following vulnerability has been resolved:  ALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt  I got a null-ptr-defer error report when I do the following tests on the qemu platform:  make defconfig and CONFIG_PARPORT=m, CONFIG_PARPORT_PC=m, CONFIG_SND_MTS64=m  Then making test scripts: cat\u003etest_mod1.sh\u003c\u003cEOF modprobe snd-mts64 modprobe snd-mts64 EOF  Executing the script, perhaps several times, we will get a null-ptr-defer report, as follow:  syzkaller:~# ./test_mod.sh snd_mts64: probe of snd_mts64.0 failed with error -5 modprobe: ERROR: could not insert 'snd_mts64': No such device  BUG: kernel NULL pointer dereference, address: 0000000000000000  #PF: supervisor write access in kernel mode  #PF: error_code(0x0002) - not-present page  PGD 0 P4D 0  Oops: 0002 [#1] PREEMPT SMP PTI  CPU: 0 PID: 205 Comm: modprobe Not tainted 6.1.0-rc8-00588-g76dcd734eca2 #6  Call Trace:   \u003cIRQ\u003e   snd_mts64_interrupt+0x24/0xa0 [snd_mts64]   parport_irq_handler+0x37/0x50 [parport]   __handle_irq_event_percpu+0x39/0x190   handle_irq_event_percpu+0xa/0x30   handle_irq_event+0x2f/0x50   handle_edge_irq+0x99/0x1b0   __common_interrupt+0x5d/0x100   common_interrupt+0xa0/0xc0   \u003c/IRQ\u003e   \u003cTASK\u003e   asm_common_interrupt+0x22/0x40  RIP: 0010:_raw_write_unlock_irqrestore+0x11/0x30   parport_claim+0xbd/0x230 [parport]   snd_mts64_probe+0x14a/0x465 [snd_mts64]   platform_probe+0x3f/0xa0   really_probe+0x129/0x2c0   __driver_probe_device+0x6d/0xc0   driver_probe_device+0x1a/0xa0   __device_attach_driver+0x7a/0xb0   bus_for_each_drv+0x62/0xb0   __device_attach+0xe4/0x180   bus_probe_device+0x82/0xa0   device_add+0x550/0x920   platform_device_add+0x106/0x220   snd_mts64_attach+0x2e/0x80 [snd_mts64]   port_check+0x14/0x20 [parport]   bus_for_each_dev+0x6e/0xc0   __parport_register_driver+0x7c/0xb0 [parport]   snd_mts64_module_init+0x31/0x1000 [snd_mts64]   do_one_initcall+0x3c/0x1f0   do_init_module+0x46/0x1c6   load_module+0x1d8d/0x1e10   __do_sys_finit_module+0xa2/0xf0   do_syscall_64+0x37/0x90   entry_SYSCALL_64_after_hwframe+0x63/0xcd   \u003c/TASK\u003e  Kernel panic - not syncing: Fatal exception in interrupt  Rebooting in 1 seconds..  The mts wa not initialized during interrupt,  we add check for mts to fix this bug.","modified":"2026-09-01T16:05:36.217400631Z","published":"2025-12-24T13:16:04.120Z","upstream":["CVE-2022-50773"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-50773"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50773.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50773.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50773.json"}}],"schema_version":"1.9.0"}