{"id":"DEBIAN-CVE-2024-50073","details":"In the Linux kernel, the following vulnerability has been resolved:  tty: n_gsm: Fix use-after-free in gsm_cleanup_mux  BUG: KASAN: slab-use-after-free in gsm_cleanup_mux+0x77b/0x7b0 drivers/tty/n_gsm.c:3160 [n_gsm] Read of size 8 at addr ffff88815fe99c00 by task poc/3379 CPU: 0 UID: 0 PID: 3379 Comm: poc Not tainted 6.11.0+ #56 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 Call Trace:  \u003cTASK\u003e  gsm_cleanup_mux+0x77b/0x7b0 drivers/tty/n_gsm.c:3160 [n_gsm]  __pfx_gsm_cleanup_mux+0x10/0x10 drivers/tty/n_gsm.c:3124 [n_gsm]  __pfx_sched_clock_cpu+0x10/0x10 kernel/sched/clock.c:389  update_load_avg+0x1c1/0x27b0 kernel/sched/fair.c:4500  __pfx_min_vruntime_cb_rotate+0x10/0x10 kernel/sched/fair.c:846  __rb_insert_augmented+0x492/0xbf0 lib/rbtree.c:161  gsmld_ioctl+0x395/0x1450 drivers/tty/n_gsm.c:3408 [n_gsm]  _raw_spin_lock_irqsave+0x92/0xf0 arch/x86/include/asm/atomic.h:107  __pfx_gsmld_ioctl+0x10/0x10 drivers/tty/n_gsm.c:3822 [n_gsm]  ktime_get+0x5e/0x140 kernel/time/timekeeping.c:195  ldsem_down_read+0x94/0x4e0 arch/x86/include/asm/atomic64_64.h:79  __pfx_ldsem_down_read+0x10/0x10 drivers/tty/tty_ldsem.c:338  __pfx_do_vfs_ioctl+0x10/0x10 fs/ioctl.c:805  tty_ioctl+0x643/0x1100 drivers/tty/tty_io.c:2818  Allocated by task 65:  gsm_data_alloc.constprop.0+0x27/0x190 drivers/tty/n_gsm.c:926 [n_gsm]  gsm_send+0x2c/0x580 drivers/tty/n_gsm.c:819 [n_gsm]  gsm1_receive+0x547/0xad0 drivers/tty/n_gsm.c:3038 [n_gsm]  gsmld_receive_buf+0x176/0x280 drivers/tty/n_gsm.c:3609 [n_gsm]  tty_ldisc_receive_buf+0x101/0x1e0 drivers/tty/tty_buffer.c:391  tty_port_default_receive_buf+0x61/0xa0 drivers/tty/tty_port.c:39  flush_to_ldisc+0x1b0/0x750 drivers/tty/tty_buffer.c:445  process_scheduled_works+0x2b0/0x10d0 kernel/workqueue.c:3229  worker_thread+0x3dc/0x950 kernel/workqueue.c:3391  kthread+0x2a3/0x370 kernel/kthread.c:389  ret_from_fork+0x2d/0x70 arch/x86/kernel/process.c:147  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:257  Freed by task 3367:  kfree+0x126/0x420 mm/slub.c:4580  gsm_cleanup_mux+0x36c/0x7b0 drivers/tty/n_gsm.c:3160 [n_gsm]  gsmld_ioctl+0x395/0x1450 drivers/tty/n_gsm.c:3408 [n_gsm]  tty_ioctl+0x643/0x1100 drivers/tty/tty_io.c:2818  [Analysis] gsm_msg on the tx_ctrl_list or tx_data_list of gsm_mux can be freed by multi threads through ioctl,which leads to the occurrence of uaf. Protect it by gsm tx lock.","modified":"2026-08-04T05:47:49.783341871Z","published":"2024-10-29T01:15:04.463Z","upstream":["CVE-2024-50073"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-50073"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.115-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","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/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50073.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50073.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50073.json"}},{"package":{"name":"linux-6.1","ecosystem":"Debian:11","purl":"pkg:deb/debian/linux-6.1?arch=source&distro=bullseye"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.119-1~deb11u1"}]}],"versions":["6.1.106-3~deb11u1","6.1.106-3~deb11u2","6.1.106-3~deb11u3","6.1.112-1~deb11u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50073.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}