{"id":"CVE-2026-31578","state":"PUBLISHED","title":"media: as102: fix to not free memory after the device is registered in as102_usb_probe()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: as102: fix to not free memory after the device is registered in as102_usb_probe()\n\nIn as102_usb driver, the following race condition occurs:\n```\n\t\tCPU0\t\t\t\t\t\tCPU1\nas102_usb_probe()\n  kzalloc(); // alloc as102_dev_t\n  ....\n  usb_register_dev();\n\t\t\t\t\t\tfd = sys_open(\"/path/to/dev\"); // open as102 fd\n\t\t\t\t\t\t....\n  usb_deregister_dev();\n  ....\n  kfree(); // free as102_dev_t\n  ....\n\t\t\t\t\t\tsys_close(fd);\n\t\t\t\t\t\t  as102_release() // UAF!!\n\t\t\t\t\t\t    as102_usb_release()\n\t\t\t\t\t\t      kfree(); // DFB!!\n```\n\nWhen a USB character device registered with usb_register_dev() is later\nunregistered (via usb_deregister_dev() or disconnect), the device node is\nremoved so new open() calls fail. However, file descriptors that are\nalready open do not go away immediately: they remain valid until the last\nreference is dropped and the driver's .release() is invoked.\n\nIn as102, as102_usb_probe() calls usb_register_dev() and then, on an\nerror path, does usb_deregister_dev() and frees as102_dev_t right away.\nIf userspace raced a successful open() before the deregistration, that\nopen FD will later hit as102_release() --> as102_usb_release() and access\nor free as102_dev_t again, occur a race to use-after-free and\ndouble-free vuln.\n\nThe fix is to never kfree(as102_dev_t) directly once usb_register_dev()\nhas succeeded. After deregistration, defer freeing memory to .release().\n\nIn other words, let release() perform the last kfree when the final open\nFD is closed.","publishedAt":"2026-04-24T14:42:09.519Z","updatedAt":"2026-06-14T17:42:03.244Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"0d36653a3a821e5a974798adb347b3ea09332914","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"25d500cf391e384356a612b85cf60b353ad3cd0c","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"07ceb444c8f627cf863864d4274b5a77769725ed","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"cb8092038e95dc1113a68e63762de40fff61ba71","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"582fbecb3756330006fe1950762412a68c2cacd2","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"09e9206008b887aa553733bd915d73131071a086","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"2eeae47a438694408189138048a786be99954032","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"7e5aedf6059cba2a669d86caeaf5a51f33ec85a1","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/usb/as102/as102_usb_drv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0.1","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/usb/as102/as102_usb_drv.c"]}],"references":["https://git.kernel.org/stable/c/0d36653a3a821e5a974798adb347b3ea09332914","https://git.kernel.org/stable/c/25d500cf391e384356a612b85cf60b353ad3cd0c","https://git.kernel.org/stable/c/07ceb444c8f627cf863864d4274b5a77769725ed","https://git.kernel.org/stable/c/cb8092038e95dc1113a68e63762de40fff61ba71","https://git.kernel.org/stable/c/582fbecb3756330006fe1950762412a68c2cacd2","https://git.kernel.org/stable/c/09e9206008b887aa553733bd915d73131071a086","https://git.kernel.org/stable/c/2eeae47a438694408189138048a786be99954032","https://git.kernel.org/stable/c/7e5aedf6059cba2a669d86caeaf5a51f33ec85a1","https://git.kernel.org/stable/c/8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31578.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31578","state":"PUBLISHED","datePublished":"2026-04-24T14:42:09.519Z","dateUpdated":"2026-06-14T17:42:03.244Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.119Z"},"containers":{"cna":{"title":"media: as102: fix to not free memory after the device is registered in as102_usb_probe()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: as102: fix to not free memory after the device is registered in as102_usb_probe()\n\nIn as102_usb driver, the following race condition occurs:\n```\n\t\tCPU0\t\t\t\t\t\tCPU1\nas102_usb_probe()\n  kzalloc(); // alloc as102_dev_t\n  ....\n  usb_register_dev();\n\t\t\t\t\t\tfd = sys_open(\"/path/to/dev\"); // open as102 fd\n\t\t\t\t\t\t....\n  usb_deregister_dev();\n  ....\n  kfree(); // free as102_dev_t\n  ....\n\t\t\t\t\t\tsys_close(fd);\n\t\t\t\t\t\t  as102_release() // UAF!!\n\t\t\t\t\t\t    as102_usb_release()\n\t\t\t\t\t\t      kfree(); // DFB!!\n```\n\nWhen a USB character device registered with usb_register_dev() is later\nunregistered (via usb_deregister_dev() or disconnect), the device node is\nremoved so new open() calls fail. However, file descriptors that are\nalready open do not go away immediately: they remain valid until the last\nreference is dropped and the driver's .release() is invoked.\n\nIn as102, as102_usb_probe() calls usb_register_dev() and then, on an\nerror path, does usb_deregister_dev() and frees as102_dev_t right away.\nIf userspace raced a successful open() before the deregistration, that\nopen FD will later hit as102_release() --> as102_usb_release() and access\nor free as102_dev_t again, occur a race to use-after-free and\ndouble-free vuln.\n\nThe fix is to never kfree(as102_dev_t) directly once usb_register_dev()\nhas succeeded. After deregistration, defer freeing memory to .release().\n\nIn other words, let release() perform the last kfree when the final open\nFD is closed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"0d36653a3a821e5a974798adb347b3ea09332914","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"25d500cf391e384356a612b85cf60b353ad3cd0c","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"07ceb444c8f627cf863864d4274b5a77769725ed","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"cb8092038e95dc1113a68e63762de40fff61ba71","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"582fbecb3756330006fe1950762412a68c2cacd2","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"09e9206008b887aa553733bd915d73131071a086","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"2eeae47a438694408189138048a786be99954032","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"7e5aedf6059cba2a669d86caeaf5a51f33ec85a1","versionType":"git"},{"version":"cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c","status":"affected","lessThan":"8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/usb/as102/as102_usb_drv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0.1","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/usb/as102/as102_usb_drv.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0d36653a3a821e5a974798adb347b3ea09332914"},{"url":"https://git.kernel.org/stable/c/25d500cf391e384356a612b85cf60b353ad3cd0c"},{"url":"https://git.kernel.org/stable/c/07ceb444c8f627cf863864d4274b5a77769725ed"},{"url":"https://git.kernel.org/stable/c/cb8092038e95dc1113a68e63762de40fff61ba71"},{"url":"https://git.kernel.org/stable/c/582fbecb3756330006fe1950762412a68c2cacd2"},{"url":"https://git.kernel.org/stable/c/09e9206008b887aa553733bd915d73131071a086"},{"url":"https://git.kernel.org/stable/c/2eeae47a438694408189138048a786be99954032"},{"url":"https://git.kernel.org/stable/c/7e5aedf6059cba2a669d86caeaf5a51f33ec85a1"},{"url":"https://git.kernel.org/stable/c/8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-14T17:42:03.244Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.6.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.12.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"7.0.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}