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CVE-2024-50073— tty: n_gsm: Fix use-after-free in gsm_cleanup_mux

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在gsm_cleanup_mux函数中存在内存释放后重用问题，导致内存泄漏。

CVSS 7.8 · High EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 0af021678d5d30c31f5a6b631f404ead3575212a< bf171b5e86e41de4c1cf32fb7aefa275c3d7de49 affected
0af021678d5d30c31f5a6b631f404ead3575212a< c29f192e0d44cc1cbaf698fa1ff198f63556691a affected
0af021678d5d30c31f5a6b631f404ead3575212a< 0eec592c6a7460ba795d7de29f3dc95cb5422e62 affected
0af021678d5d30c31f5a6b631f404ead3575212a< 9462f4ca56e7d2430fdb6dcc8498244acbfc4489 affected
5020173e7e7725110a8d4be1359bf1dfc4b1814d affected
c165698c9919b000bdbe73859d3bb7b33bdb9223 affected
7962a4b900099cf90e02859bb297f2c618d8d940 affected
5.15.209< 5.16 affected
… +8 more rows
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I. Basic Information for CVE-2024-50073

Vulnerability Information
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Vulnerability Title
tty: n_gsm: Fix use-after-free in gsm_cleanup_mux
Source: CVE Program / CVE List V5
Vulnerability Description
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: <TASK> 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在gsm_cleanup_mux函数中存在内存释放后重用问题，导致内存泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0af021678d5d30c31f5a6b631f404ead3575212a ~ bf171b5e86e41de4c1cf32fb7aefa275c3d7de49 -
Linux Linux 6.0 -

II. Public POCs for CVE-2024-50073

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2024-50073

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Patches & Fixes for CVE-2024-50073 (2)

Same Patch Batch · Linux · 2024-10-29 · 21 CVEs total

CVE-2024-50086 9.8 CRITICAL ksmbd: fix user-after-free from session log off
CVE-2024-50085 9.8 CRITICAL mptcp: pm: fix UaF read in mptcp_pm_nl_rm_addr_or_subflow
CVE-2024-50075 8.0 HIGH xhci: tegra: fix checked USB2 port number
CVE-2024-50087 7.8 HIGH btrfs: fix uninitialized pointer free on read_alloc_one_name() error
CVE-2024-50074 7.8 HIGH parport: Proper fix for array out-of-bounds access
CVE-2024-50077 7.8 HIGH Bluetooth: ISO: Fix multiple init when debugfs is disabled
CVE-2024-50078 7.8 HIGH Bluetooth: Call iso_exit() on module unload
CVE-2024-50082 7.8 HIGH blk-rq-qos: fix crash on rq_qos_wait vs. rq_qos_wake_function race
CVE-2024-50088 7.8 HIGH btrfs: fix uninitialized pointer free in add_inode_ref()
CVE-2024-50081 blk-mq: setup queue ->tag_set before initializing hctx
CVE-2024-50080 ublk: don't allow user copy for unprivileged device
CVE-2024-50079 io_uring/sqpoll: ensure task state is TASK_RUNNING when running task_work
CVE-2024-50083 tcp: fix mptcp DSS corruption due to large pmtu xmit
CVE-2024-50076 vt: prevent kernel-infoleak in con_font_get()
CVE-2024-50084 net: microchip: vcap api: Fix memory leaks in vcap_api_encode_rule_test()
CVE-2024-50072 x86/bugs: Use code segment selector for VERW operand
CVE-2024-50071 pinctrl: nuvoton: fix a double free in ma35_pinctrl_dt_node_to_map_func()
CVE-2024-50070 pinctrl: stm32: check devm_kasprintf() returned value
CVE-2024-50069 pinctrl: apple: check devm_kasprintf() returned value
CVE-2024-50068 mm/damon/tests/sysfs-kunit.h: fix memory leak in damon_sysfs_test_add_targets()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-50073

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