{"id":"CVE-2025-68331","state":"PUBLISHED","title":"usb: uas: fix urb unmapping issue when the uas device is remove during ongoing data transfer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: uas: fix urb unmapping issue when the uas device is remove during ongoing data transfer\n\nWhen a UAS device is unplugged during data transfer, there is\na probability of a system panic occurring. The root cause is\nan access to an invalid memory address during URB callback handling.\nSpecifically, this happens when the dma_direct_unmap_sg() function\nis called within the usb_hcd_unmap_urb_for_dma() interface, but the\nsg->dma_address field is 0 and the sg data structure has already been\nfreed.\n\nThe SCSI driver sends transfer commands by invoking uas_queuecommand_lck()\nin uas.c, using the uas_submit_urbs() function to submit requests to USB.\nWithin the uas_submit_urbs() implementation, three URBs (sense_urb,\ndata_urb, and cmd_urb) are sequentially submitted. Device removal may\noccur at any point during uas_submit_urbs execution, which may result\nin URB submission failure. However, some URBs might have been successfully\nsubmitted before the failure, and uas_submit_urbs will return the -ENODEV\nerror code in this case. The current error handling directly calls\nscsi_done(). In the SCSI driver, this eventually triggers scsi_complete()\nto invoke scsi_end_request() for releasing the sgtable. The successfully\nsubmitted URBs, when being unlinked to giveback, call\nusb_hcd_unmap_urb_for_dma() in hcd.c, leading to exceptions during sg\nunmapping operations since the sg data structure has already been freed.\n\nThis patch modifies the error condition check in the uas_submit_urbs()\nfunction. When a UAS device is removed but one or more URBs have already\nbeen successfully submitted to USB, it avoids immediately invoking\nscsi_done() and save the cmnd to devinfo->cmnd array. If the successfully\nsubmitted URBs is completed before devinfo->resetting being set, then\nthe scsi_done() function will be called within uas_try_complete() after\nall pending URB operations are finalized. Otherwise, the scsi_done()\nfunction will be called within uas_zap_pending(), which is executed after\nusb_kill_anchored_urbs().\n\nThe error handling only takes effect when uas_queuecommand_lck() calls\nuas_submit_urbs() and returns the error value -ENODEV . In this case,\nthe device is disconnected, and the flow proceeds to uas_disconnect(),\nwhere uas_zap_pending() is invoked to call uas_try_complete().","publishedAt":"2025-12-22T16:12:24.607Z","updatedAt":"2026-05-11T21:51:07.296Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"6289fc489e94c9beb6be2b502ccc263663733d72","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"66ac05e7b0d6bbd1bee9fcf729e20fd4cce86d17","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"75f8e2643085db4f7e136fc6b368eb114dd80a64","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"e3a55221f4de080cb7a91ba10f01c4f708603f8d","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"2b90a8131c83f6f2be69397d2b7d14d217d95d2f","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"426edbfc88b22601ea34a441a469092e7b301c52","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"26d56a9fcb2014b99e654127960aa0a48a391e3c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/storage/uas.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.247","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.197","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.159","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.119","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.61","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.11","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/usb/storage/uas.c"]}],"references":["https://git.kernel.org/stable/c/6289fc489e94c9beb6be2b502ccc263663733d72","https://git.kernel.org/stable/c/66ac05e7b0d6bbd1bee9fcf729e20fd4cce86d17","https://git.kernel.org/stable/c/75f8e2643085db4f7e136fc6b368eb114dd80a64","https://git.kernel.org/stable/c/e3a55221f4de080cb7a91ba10f01c4f708603f8d","https://git.kernel.org/stable/c/2b90a8131c83f6f2be69397d2b7d14d217d95d2f","https://git.kernel.org/stable/c/426edbfc88b22601ea34a441a469092e7b301c52","https://git.kernel.org/stable/c/26d56a9fcb2014b99e654127960aa0a48a391e3c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68331.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68331","state":"PUBLISHED","datePublished":"2025-12-22T16:12:24.607Z","dateUpdated":"2026-05-11T21:51:07.296Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-16T14:48:05.296Z"},"containers":{"cna":{"title":"usb: uas: fix urb unmapping issue when the uas device is remove during ongoing data transfer","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: uas: fix urb unmapping issue when the uas device is remove during ongoing data transfer\n\nWhen a UAS device is unplugged during data transfer, there is\na probability of a system panic occurring. The root cause is\nan access to an invalid memory address during URB callback handling.\nSpecifically, this happens when the dma_direct_unmap_sg() function\nis called within the usb_hcd_unmap_urb_for_dma() interface, but the\nsg->dma_address field is 0 and the sg data structure has already been\nfreed.\n\nThe SCSI driver sends transfer commands by invoking uas_queuecommand_lck()\nin uas.c, using the uas_submit_urbs() function to submit requests to USB.\nWithin the uas_submit_urbs() implementation, three URBs (sense_urb,\ndata_urb, and cmd_urb) are sequentially submitted. Device removal may\noccur at any point during uas_submit_urbs execution, which may result\nin URB submission failure. However, some URBs might have been successfully\nsubmitted before the failure, and uas_submit_urbs will return the -ENODEV\nerror code in this case. The current error handling directly calls\nscsi_done(). In the SCSI driver, this eventually triggers scsi_complete()\nto invoke scsi_end_request() for releasing the sgtable. The successfully\nsubmitted URBs, when being unlinked to giveback, call\nusb_hcd_unmap_urb_for_dma() in hcd.c, leading to exceptions during sg\nunmapping operations since the sg data structure has already been freed.\n\nThis patch modifies the error condition check in the uas_submit_urbs()\nfunction. When a UAS device is removed but one or more URBs have already\nbeen successfully submitted to USB, it avoids immediately invoking\nscsi_done() and save the cmnd to devinfo->cmnd array. If the successfully\nsubmitted URBs is completed before devinfo->resetting being set, then\nthe scsi_done() function will be called within uas_try_complete() after\nall pending URB operations are finalized. Otherwise, the scsi_done()\nfunction will be called within uas_zap_pending(), which is executed after\nusb_kill_anchored_urbs().\n\nThe error handling only takes effect when uas_queuecommand_lck() calls\nuas_submit_urbs() and returns the error value -ENODEV . In this case,\nthe device is disconnected, and the flow proceeds to uas_disconnect(),\nwhere uas_zap_pending() is invoked to call uas_try_complete()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"6289fc489e94c9beb6be2b502ccc263663733d72","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"66ac05e7b0d6bbd1bee9fcf729e20fd4cce86d17","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"75f8e2643085db4f7e136fc6b368eb114dd80a64","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"e3a55221f4de080cb7a91ba10f01c4f708603f8d","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"2b90a8131c83f6f2be69397d2b7d14d217d95d2f","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"426edbfc88b22601ea34a441a469092e7b301c52","versionType":"git"},{"version":"eb2a86ae8c544be0ab04aa8169390c0669bc7148","status":"affected","lessThan":"26d56a9fcb2014b99e654127960aa0a48a391e3c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/storage/uas.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.247","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.197","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.159","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.119","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.61","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.11","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/usb/storage/uas.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6289fc489e94c9beb6be2b502ccc263663733d72"},{"url":"https://git.kernel.org/stable/c/66ac05e7b0d6bbd1bee9fcf729e20fd4cce86d17"},{"url":"https://git.kernel.org/stable/c/75f8e2643085db4f7e136fc6b368eb114dd80a64"},{"url":"https://git.kernel.org/stable/c/e3a55221f4de080cb7a91ba10f01c4f708603f8d"},{"url":"https://git.kernel.org/stable/c/2b90a8131c83f6f2be69397d2b7d14d217d95d2f"},{"url":"https://git.kernel.org/stable/c/426edbfc88b22601ea34a441a469092e7b301c52"},{"url":"https://git.kernel.org/stable/c/26d56a9fcb2014b99e654127960aa0a48a391e3c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:51:07.296Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.247"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.197"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.1.159"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.119"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.17.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}