{"id":"CVE-2026-31497","state":"PUBLISHED","title":"Bluetooth: btusb: clamp SCO altsetting table indices","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: clamp SCO altsetting table indices\n\nbtusb_work() maps the number of active SCO links to USB alternate\nsettings through a three-entry lookup table when CVSD traffic uses\ntransparent voice settings. The lookup currently indexes alts[] with\ndata->sco_num - 1 without first constraining sco_num to the number of\navailable table entries.\n\nWhile the table only defines alternate settings for up to three SCO\nlinks, data->sco_num comes from hci_conn_num() and is used directly.\nCap the lookup to the last table entry before indexing it so the\ndriver keeps selecting the highest supported alternate setting without\nreading past alts[].","publishedAt":"2026-04-22T13:54:19.051Z","updatedAt":"2026-05-11T22:09:53.017Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"312c4450fe23014665c163f480edd5ad2e27bbb8","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"9dd13a8641de79bc1bc93da55cdd35259a002683","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"476c9262b430c38c6a701a3b8176a3f48689085b","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"6fba3c3d48c927e55611a0f5ea34da88138ed0ff","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"834cf890d2c3d29cbfa1ee2376c40469c28ec297","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"1019028eb124564cf7bca58a16f1df8a1ca30726","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"21c254202f9d78abe0fcd642a92966deb92bd226","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"129fa608b6ad08b8ab7178eeb2ec272c993aaccc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btusb.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.8","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btusb.c"]}],"references":["https://git.kernel.org/stable/c/312c4450fe23014665c163f480edd5ad2e27bbb8","https://git.kernel.org/stable/c/9dd13a8641de79bc1bc93da55cdd35259a002683","https://git.kernel.org/stable/c/476c9262b430c38c6a701a3b8176a3f48689085b","https://git.kernel.org/stable/c/6fba3c3d48c927e55611a0f5ea34da88138ed0ff","https://git.kernel.org/stable/c/834cf890d2c3d29cbfa1ee2376c40469c28ec297","https://git.kernel.org/stable/c/1019028eb124564cf7bca58a16f1df8a1ca30726","https://git.kernel.org/stable/c/21c254202f9d78abe0fcd642a92966deb92bd226","https://git.kernel.org/stable/c/129fa608b6ad08b8ab7178eeb2ec272c993aaccc"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31497.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31497","state":"PUBLISHED","datePublished":"2026-04-22T13:54:19.051Z","dateUpdated":"2026-05-11T22:09:53.017Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.102Z"},"containers":{"cna":{"title":"Bluetooth: btusb: clamp SCO altsetting table indices","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: clamp SCO altsetting table indices\n\nbtusb_work() maps the number of active SCO links to USB alternate\nsettings through a three-entry lookup table when CVSD traffic uses\ntransparent voice settings. The lookup currently indexes alts[] with\ndata->sco_num - 1 without first constraining sco_num to the number of\navailable table entries.\n\nWhile the table only defines alternate settings for up to three SCO\nlinks, data->sco_num comes from hci_conn_num() and is used directly.\nCap the lookup to the last table entry before indexing it so the\ndriver keeps selecting the highest supported alternate setting without\nreading past alts[]."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"312c4450fe23014665c163f480edd5ad2e27bbb8","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"9dd13a8641de79bc1bc93da55cdd35259a002683","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"476c9262b430c38c6a701a3b8176a3f48689085b","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"6fba3c3d48c927e55611a0f5ea34da88138ed0ff","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"834cf890d2c3d29cbfa1ee2376c40469c28ec297","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"1019028eb124564cf7bca58a16f1df8a1ca30726","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"21c254202f9d78abe0fcd642a92966deb92bd226","versionType":"git"},{"version":"baac6276c0a9f36f1fe1f00590ef00d2ba5ba626","status":"affected","lessThan":"129fa608b6ad08b8ab7178eeb2ec272c993aaccc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btusb.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.8","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btusb.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/312c4450fe23014665c163f480edd5ad2e27bbb8"},{"url":"https://git.kernel.org/stable/c/9dd13a8641de79bc1bc93da55cdd35259a002683"},{"url":"https://git.kernel.org/stable/c/476c9262b430c38c6a701a3b8176a3f48689085b"},{"url":"https://git.kernel.org/stable/c/6fba3c3d48c927e55611a0f5ea34da88138ed0ff"},{"url":"https://git.kernel.org/stable/c/834cf890d2c3d29cbfa1ee2376c40469c28ec297"},{"url":"https://git.kernel.org/stable/c/1019028eb124564cf7bca58a16f1df8a1ca30726"},{"url":"https://git.kernel.org/stable/c/21c254202f9d78abe0fcd642a92966deb92bd226"},{"url":"https://git.kernel.org/stable/c/129fa608b6ad08b8ab7178eeb2ec272c993aaccc"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:09:53.017Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}