CVE-2022-49940
tty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf()
- Published
- Updated
- Reserved
- Assigned by
- Linux
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
Timeline
ID reserved
By Linux
- 48 days later
· 48 days later
Published
- 11 months later
· 11 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected b8faa754b523a845facdc83120b2ecd290d7fa6d – < 5a82cf64f8ad63caf6bf115642ce44ddbc64311e
- affected dfa9b6d34aac2154b5e926d7a7a061123bf137c6 – < 309aea4b6b813f6678c3a547cfd7fe3a76ffa976
- affected 5e59c010c6862da329db17acca086afd8bea1aa8 – < 5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b
- affected 01aecd917114577c423f07cec0d186ad007d76fc – < f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb
- affected 2dc1be365a70699f7dda92fd9e48b84546086070
- affected 5.18.18 – < 5.19
- affected 5.15.61 – < 5.15.66
- affected 5.19.2 – < 5.19.8
References (4)
- https://git.kernel.org/stable/c/5a82cf64f8ad63caf6bf115642ce44ddbc64311e (opens in a new tab)
- https://git.kernel.org/stable/c/309aea4b6b813f6678c3a547cfd7fe3a76ffa976 (opens in a new tab)
- https://git.kernel.org/stable/c/5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b (opens in a new tab)
- https://git.kernel.org/stable/c/f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49940)Record last updated .