{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49940","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-05-01T14:05:17.255Z","datePublished":"2025-06-18T10:54:40.745Z","dateUpdated":"2026-05-11T19:09:38.272Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:09:38.272Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf()\n\nA null pointer dereference can happen when attempting to access the\n\"gsm->receive()\" function in gsmld_receive_buf(). Currently, the code\nassumes that gsm->recieve is only called after MUX activation.\nSince the gsmld_receive_buf() function can be accessed without the need to\ninitialize the MUX, the gsm->receive() function will not be set and a\nNULL pointer dereference will occur.\n\nFix this by avoiding the call to \"gsm->receive()\" in case the function is\nnot initialized by adding a sanity check.\n\nCall Trace:\n <TASK>\n gsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861\n tiocsti drivers/tty/tty_io.c:2293 [inline]\n tty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:870 [inline]\n __se_sys_ioctl fs/ioctl.c:856 [inline]\n __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/n_gsm.c"],"versions":[{"version":"b8faa754b523a845facdc83120b2ecd290d7fa6d","lessThan":"5a82cf64f8ad63caf6bf115642ce44ddbc64311e","status":"affected","versionType":"git"},{"version":"dfa9b6d34aac2154b5e926d7a7a061123bf137c6","lessThan":"309aea4b6b813f6678c3a547cfd7fe3a76ffa976","status":"affected","versionType":"git"},{"version":"5e59c010c6862da329db17acca086afd8bea1aa8","lessThan":"5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b","status":"affected","versionType":"git"},{"version":"01aecd917114577c423f07cec0d186ad007d76fc","lessThan":"f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb","status":"affected","versionType":"git"},{"version":"2dc1be365a70699f7dda92fd9e48b84546086070","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/n_gsm.c"],"versions":[{"version":"5.15.61","lessThan":"5.15.66","status":"affected","versionType":"semver"},{"version":"5.19.2","lessThan":"5.19.8","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.61","versionEndExcluding":"5.15.66"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19.2","versionEndExcluding":"5.19.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/5a82cf64f8ad63caf6bf115642ce44ddbc64311e"},{"url":"https://git.kernel.org/stable/c/309aea4b6b813f6678c3a547cfd7fe3a76ffa976"},{"url":"https://git.kernel.org/stable/c/5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b"},{"url":"https://git.kernel.org/stable/c/f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb"}],"title":"tty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf()","x_generator":{"engine":"bippy-1.2.0"}}}}