CVE-2022-49940

Advisory lineage Upstream: 0 Downstream: 9
Analyzed
Published: 18 Jun 2025, 10:54
Last modified:23 May 2026, 15:23

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.07% LOW
0% probability +0.05%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

18 Jun 2025, 10:54
Published
Vulnerability first disclosed
23 May 2026, 15:23
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf() A null pointer dereference can happen when attempting to access the "gsm->receive()" function in gsmld_receive_buf(). Currently, the code assumes that gsm->recieve is only called after MUX activation. Since the gsmld_receive_buf() function can be accessed without the need to initialize the MUX, the gsm->receive() function will not be set and a NULL pointer dereference will occur. Fix this by avoiding the call to "gsm->receive()" in case the function is not initialized by adding a sanity check. Call Trace: <TASK> gsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861 tiocsti drivers/tty/tty_io.c:2293 [inline] tty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.07%• Percentile: 20%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • linux•linux

    ≥ b8faa754b523a845facdc83120b2ecd290d7fa6d, < 5a82cf64f8ad63caf6bf115642ce44ddbc64311e | ≥ dfa9b6d34aac2154b5e926d7a7a061123bf137c6, < 309aea4b6b813f6678c3a547cfd7fe3a76ffa976 | ≥ 5e59c010c6862da329db17acca086afd8bea1aa8, < 5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b | ≥ 01aecd917114577c423f07cec0d186ad007d76fc, < f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb | 2dc1be365a70699f7dda92fd9e48b84546086070 | ≥ 5.18.18, < 5.19 | ≥ 5.15.61, < 5.15.66 | ≥ 5.19.2, < 5.19.8

  • linux•linux_kernel

    ≥ 5.15.61, < 5.15.66 | ≥ 5.18.18, < 5.19 | ≥ 5.19.2, < 5.19.8 | 6.0:rc1 | 6.0:rc2 | 6.0:rc3

References (4)