{"id":"CVE-2025-40071","state":"PUBLISHED","title":"tty: n_gsm: Don't block input queue by waiting MSC","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: n_gsm: Don't block input queue by waiting MSC\n\nCurrently gsm_queue() processes incoming frames and when opening\na DLC channel it calls gsm_dlci_open() which calls gsm_modem_update().\nIf basic mode is used it calls gsm_modem_upd_via_msc() and it\ncannot block the input queue by waiting the response to come\ninto the same input queue.\n\nInstead allow sending Modem Status Command without waiting for remote\nend to respond. Define a new function gsm_modem_send_initial_msc()\nfor this purpose. As MSC is only valid for basic encoding, it does\nnot do anything for advanced or when convergence layer type 2 is used.","publishedAt":"2025-10-28T11:48:39.417Z","updatedAt":"2026-10-30T12:22:47.159Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"8fcc22d6b90304d8b7436e101562218ea3faf73b","versionType":"git"},{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"c36785f9de03df56ff9b8eca30fa681a12b2310d","versionType":"git"},{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"5416e89b81b00443cb03c88df8da097ae091a141","versionType":"git"},{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"c5a2791a7f11939f05f95c01f0aec0c55bbf28d5","versionType":"git"},{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"3cf0b3c243e56bc43be560617416c1d9f301f44c","versionType":"git"},{"version":"920e849b7d23ced84c9d11e11e2449e34973cfb8","status":"affected","versionType":"git"},{"version":"e83b4e1540469babeffcfd44a605cf8a61542598","status":"affected","versionType":"git"},{"version":"5.15.54","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"5.17.6","status":"affected","lessThan":"5.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/n_gsm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.18","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.112","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.53","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.3","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/n_gsm.c"]}],"references":["https://git.kernel.org/stable/c/8fcc22d6b90304d8b7436e101562218ea3faf73b","https://git.kernel.org/stable/c/c36785f9de03df56ff9b8eca30fa681a12b2310d","https://git.kernel.org/stable/c/5416e89b81b00443cb03c88df8da097ae091a141","https://git.kernel.org/stable/c/c5a2791a7f11939f05f95c01f0aec0c55bbf28d5","https://git.kernel.org/stable/c/3cf0b3c243e56bc43be560617416c1d9f301f44c"],"weaknesses":[],"ingestedAt":"2026-10-30T12:40:04.423Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40071.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40071","state":"PUBLISHED","datePublished":"2025-10-28T11:48:39.417Z","dateUpdated":"2026-10-30T12:22:47.159Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.159Z"},"containers":{"cna":{"title":"tty: n_gsm: Don't block input queue by waiting MSC","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: n_gsm: Don't block input queue by waiting MSC\n\nCurrently gsm_queue() processes incoming frames and when opening\na DLC channel it calls gsm_dlci_open() which calls gsm_modem_update().\nIf basic mode is used it calls gsm_modem_upd_via_msc() and it\ncannot block the input queue by waiting the response to come\ninto the same input queue.\n\nInstead allow sending Modem Status Command without waiting for remote\nend to respond. Define a new function gsm_modem_send_initial_msc()\nfor this purpose. As MSC is only valid for basic encoding, it does\nnot do anything for advanced or when convergence layer type 2 is used."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"8fcc22d6b90304d8b7436e101562218ea3faf73b","versionType":"git"},{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"c36785f9de03df56ff9b8eca30fa681a12b2310d","versionType":"git"},{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"5416e89b81b00443cb03c88df8da097ae091a141","versionType":"git"},{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"c5a2791a7f11939f05f95c01f0aec0c55bbf28d5","versionType":"git"},{"version":"48473802506d2d6151f59e0e764932b33b53cb3b","status":"affected","lessThan":"3cf0b3c243e56bc43be560617416c1d9f301f44c","versionType":"git"},{"version":"920e849b7d23ced84c9d11e11e2449e34973cfb8","status":"affected","versionType":"git"},{"version":"e83b4e1540469babeffcfd44a605cf8a61542598","status":"affected","versionType":"git"},{"version":"5.15.54","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"5.17.6","status":"affected","lessThan":"5.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/n_gsm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.18","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.112","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.53","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.3","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/n_gsm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8fcc22d6b90304d8b7436e101562218ea3faf73b"},{"url":"https://git.kernel.org/stable/c/c36785f9de03df56ff9b8eca30fa681a12b2310d"},{"url":"https://git.kernel.org/stable/c/5416e89b81b00443cb03c88df8da097ae091a141"},{"url":"https://git.kernel.org/stable/c/c5a2791a7f11939f05f95c01f0aec0c55bbf28d5"},{"url":"https://git.kernel.org/stable/c/3cf0b3c243e56bc43be560617416c1d9f301f44c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:22:47.159Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.6.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.12.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.17.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17.6"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}