{"id":"DEBIAN-CVE-2022-48870","details":"In the Linux kernel, the following vulnerability has been resolved:  tty: fix possible null-ptr-defer in spk_ttyio_release  Run the following tests on the qemu platform:  syzkaller:~# modprobe speakup_audptr  input: Speakup as /devices/virtual/input/input4  initialized device: /dev/synth, node (MAJOR 10, MINOR 125)  speakup 3.1.6: initialized  synth name on entry is: (null)  synth probe  spk_ttyio_initialise_ldisc failed because tty_kopen_exclusive returned failed (errno -16), then remove the module, we will get a null-ptr-defer problem, as follow:  syzkaller:~# modprobe -r speakup_audptr  releasing synth audptr  BUG: kernel NULL pointer dereference, address: 0000000000000080  #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: 2 PID: 204 Comm: modprobe Not tainted 6.1.0-rc6-dirty #1  RIP: 0010:mutex_lock+0x14/0x30  Call Trace:  \u003cTASK\u003e   spk_ttyio_release+0x19/0x70 [speakup]   synth_release.part.6+0xac/0xc0 [speakup]   synth_remove+0x56/0x60 [speakup]   __x64_sys_delete_module+0x156/0x250   ? fpregs_assert_state_consistent+0x1d/0x50   do_syscall_64+0x37/0x90   entry_SYSCALL_64_after_hwframe+0x63/0xcd  \u003c/TASK\u003e  Modules linked in: speakup_audptr(-) speakup  Dumping ftrace buffer:  in_synth-\u003edev was not initialized during modprobe, so we add check for in_synth-\u003edev to fix this bug.","modified":"2026-08-27T23:04:17.491105251Z","published":"2024-08-21T07:15:04.143Z","upstream":["CVE-2022-48870"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-48870"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.8-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48870.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.8-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48870.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.8-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48870.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}