{"id":"CVE-2024-26935","state":"PUBLISHED","title":"scsi: core: Fix unremoved procfs host directory regression","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Fix unremoved procfs host directory regression\n\nCommit fc663711b944 (\"scsi: core: Remove the /proc/scsi/${proc_name}\ndirectory earlier\") fixed a bug related to modules loading/unloading, by\nadding a call to scsi_proc_hostdir_rm() on scsi_remove_host(). But that led\nto a potential duplicate call to the hostdir_rm() routine, since it's also\ncalled from scsi_host_dev_release(). That triggered a regression report,\nwhich was then fixed by commit be03df3d4bfe (\"scsi: core: Fix a procfs host\ndirectory removal regression\"). The fix just dropped the hostdir_rm() call\nfrom dev_release().\n\nBut it happens that this proc directory is created on scsi_host_alloc(),\nand that function \"pairs\" with scsi_host_dev_release(), while\nscsi_remove_host() pairs with scsi_add_host(). In other words, it seems the\nreason for removing the proc directory on dev_release() was meant to cover\ncases in which a SCSI host structure was allocated, but the call to\nscsi_add_host() didn't happen. And that pattern happens to exist in some\nerror paths, for example.\n\nSyzkaller causes that by using USB raw gadget device, error'ing on\nusb-storage driver, at usb_stor_probe2(). By checking that path, we can see\nthat the BadDevice label leads to a scsi_host_put() after a SCSI host\nallocation, but there's no call to scsi_add_host() in such path. That leads\nto messages like this in dmesg (and a leak of the SCSI host proc\nstructure):\n\nusb-storage 4-1:87.51: USB Mass Storage device detected\nproc_dir_entry 'scsi/usb-storage' already registered\nWARNING: CPU: 1 PID: 3519 at fs/proc/generic.c:377 proc_register+0x347/0x4e0 fs/proc/generic.c:376\n\nThe proper fix seems to still call scsi_proc_hostdir_rm() on dev_release(),\nbut guard that with the state check for SHOST_CREATED; there is even a\ncomment in scsi_host_dev_release() detailing that: such conditional is\nmeant for cases where the SCSI host was allocated but there was no calls to\n{add,remove}_host(), like the usb-storage case.\n\nThis is what we propose here and with that, the error path of usb-storage\ndoes not trigger the warning anymore.","publishedAt":"2024-05-01T05:17:31.445Z","updatedAt":"2026-10-15T00:39:28.703Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"88c3d3bb6469cea929ac68fd326bdcbefcdfdd83","status":"affected","lessThan":"0053f15d50d50c9312d8ab9c11e2e405812dfcac","versionType":"git"},{"version":"68c665bb185037e7eb66fb792c61da9d7151e99c","status":"affected","lessThan":"5c2386ba80e779a92ec3bb64ccadbedd88f779b1","versionType":"git"},{"version":"2a764d55e938743efa7c2cba7305633bcf227f09","status":"affected","lessThan":"cea234bb214b17d004dfdccce4491e6ff57c96ee","versionType":"git"},{"version":"7e0ae8667fcdd99d1756922e1140cac75f5fa279","status":"affected","lessThan":"3678cf67ff7136db1dd3bf63c361650db5d92889","versionType":"git"},{"version":"be03df3d4bfe7e8866d4aa43d62e648ffe884f5f","status":"affected","lessThan":"d4c34782b6d7b1e68d18d9549451b19433bd4c6c","versionType":"git"},{"version":"be03df3d4bfe7e8866d4aa43d62e648ffe884f5f","status":"affected","lessThan":"e293c773c13b830cdc251f155df2254981abc320","versionType":"git"},{"version":"be03df3d4bfe7e8866d4aa43d62e648ffe884f5f","status":"affected","lessThan":"f4ff08fab66eb5c0b97e1a24edac052fb40bf5d7","versionType":"git"},{"version":"be03df3d4bfe7e8866d4aa43d62e648ffe884f5f","status":"affected","lessThan":"f23a4d6e07570826fe95023ca1aa96a011fa9f84","versionType":"git"},{"version":"73f030d4ef6d1ad17f824a0a2eb637ef7a9c7d51","status":"affected","versionType":"git"},{"version":"5.4.238","status":"affected","lessThan":"5.4.274","versionType":"semver"},{"version":"5.10.176","status":"affected","lessThan":"5.10.215","versionType":"semver"},{"version":"5.15.104","status":"affected","lessThan":"5.15.154","versionType":"semver"},{"version":"6.1.21","status":"affected","lessThan":"6.1.84","versionType":"semver"},{"version":"6.2.8","status":"affected","lessThan":"6.3","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/hosts.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"5.4.274","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.215","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.154","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.84","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.24","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.12","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8.3","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/hosts.c"]}],"references":["https://git.kernel.org/stable/c/0053f15d50d50c9312d8ab9c11e2e405812dfcac","https://git.kernel.org/stable/c/5c2386ba80e779a92ec3bb64ccadbedd88f779b1","https://git.kernel.org/stable/c/cea234bb214b17d004dfdccce4491e6ff57c96ee","https://git.kernel.org/stable/c/3678cf67ff7136db1dd3bf63c361650db5d92889","https://git.kernel.org/stable/c/d4c34782b6d7b1e68d18d9549451b19433bd4c6c","https://git.kernel.org/stable/c/e293c773c13b830cdc251f155df2254981abc320","https://git.kernel.org/stable/c/f4ff08fab66eb5c0b97e1a24edac052fb40bf5d7","https://git.kernel.org/stable/c/f23a4d6e07570826fe95023ca1aa96a011fa9f84","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","https://cert-portal.siemens.com/productcert/html/ssa-265688.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:10.607Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/26xxx/CVE-2024-26935.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-26935","state":"PUBLISHED","datePublished":"2024-05-01T05:17:31.445Z","dateUpdated":"2026-10-15T00:39:28.703Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-19T14:20:24.196Z"},"containers":{"cna":{"title":"scsi: core: Fix unremoved procfs host directory regression","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Fix unremoved procfs host directory regression\n\nCommit fc663711b944 (\"scsi: core: Remove the /proc/scsi/${proc_name}\ndirectory earlier\") fixed a bug related to modules loading/unloading, by\nadding a call to scsi_proc_hostdir_rm() on scsi_remove_host(). But that led\nto a potential duplicate call to the hostdir_rm() routine, since it's also\ncalled from scsi_host_dev_release(). That triggered a regression report,\nwhich was then fixed by commit be03df3d4bfe (\"scsi: core: Fix a procfs host\ndirectory removal regression\"). The fix just dropped the hostdir_rm() call\nfrom dev_release().\n\nBut it happens that this proc directory is created on scsi_host_alloc(),\nand that function \"pairs\" with scsi_host_dev_release(), while\nscsi_remove_host() pairs with scsi_add_host(). In other words, it seems the\nreason for removing the proc directory on dev_release() was meant to cover\ncases in which a SCSI host structure was allocated, but the call to\nscsi_add_host() didn't happen. And that pattern happens to exist in some\nerror paths, for example.\n\nSyzkaller causes that by using USB raw gadget device, error'ing on\nusb-storage driver, at usb_stor_probe2(). By checking that path, we can see\nthat the BadDevice label leads to a scsi_host_put() after a SCSI host\nallocation, but there's no call to scsi_add_host() in such path. That leads\nto messages like this in dmesg (and a leak of the SCSI host proc\nstructure):\n\nusb-storage 4-1:87.51: USB Mass Storage device detected\nproc_dir_entry 'scsi/usb-storage' already registered\nWARNING: CPU: 1 PID: 3519 at fs/proc/generic.c:377 proc_register+0x347/0x4e0 fs/proc/generic.c:376\n\nThe proper fix seems to still call scsi_proc_hostdir_rm() on dev_release(),\nbut guard that with the state check for SHOST_CREATED; there is even a\ncomment in scsi_host_dev_release() detailing that: such conditional is\nmeant for cases where the SCSI host was allocated but there was no calls to\n{add,remove}_host(), like the usb-storage case.\n\nThis is what we propose here and with that, the error path of usb-storage\ndoes not trigger the warning anymore."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"88c3d3bb6469cea929ac68fd326bdcbefcdfdd83","status":"affected","lessThan":"0053f15d50d50c9312d8ab9c11e2e405812dfcac","versionType":"git"},{"version":"68c665bb185037e7eb66fb792c61da9d7151e99c","status":"affected","lessThan":"5c2386ba80e779a92ec3bb64ccadbedd88f779b1","versionType":"git"},{"version":"2a764d55e938743efa7c2cba7305633bcf227f09","status":"affected","lessThan":"cea234bb214b17d004dfdccce4491e6ff57c96ee","versionType":"git"},{"version":"7e0ae8667fcdd99d1756922e1140cac75f5fa279","status":"affected","lessThan":"3678cf67ff7136db1dd3bf63c361650db5d92889","versionType":"git"},{"version":"be03df3d4bfe7e8866d4aa43d62e648ffe884f5f","status":"affected","lessThan":"d4c34782b6d7b1e68d18d9549451b19433bd4c6c","versionType":"git"},{"version":"be03df3d4bfe7e8866d4aa43d62e648ffe884f5f","status":"affected","lessThan":"e293c773c13b830cdc251f155df2254981abc320","versionType":"git"},{"version":"be03df3d4bfe7e8866d4aa43d62e648ffe884f5f","status":"affected","lessThan":"f4ff08fab66eb5c0b97e1a24edac052fb40bf5d7","versionType":"git"},{"version":"be03df3d4bfe7e8866d4aa43d62e648ffe884f5f","status":"affected","lessThan":"f23a4d6e07570826fe95023ca1aa96a011fa9f84","versionType":"git"},{"version":"73f030d4ef6d1ad17f824a0a2eb637ef7a9c7d51","status":"affected","versionType":"git"},{"version":"5.4.238","status":"affected","lessThan":"5.4.274","versionType":"semver"},{"version":"5.10.176","status":"affected","lessThan":"5.10.215","versionType":"semver"},{"version":"5.15.104","status":"affected","lessThan":"5.15.154","versionType":"semver"},{"version":"6.1.21","status":"affected","lessThan":"6.1.84","versionType":"semver"},{"version":"6.2.8","status":"affected","lessThan":"6.3","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/hosts.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"5.4.274","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.215","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.154","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.84","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.24","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.12","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8.3","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/hosts.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0053f15d50d50c9312d8ab9c11e2e405812dfcac"},{"url":"https://git.kernel.org/stable/c/5c2386ba80e779a92ec3bb64ccadbedd88f779b1"},{"url":"https://git.kernel.org/stable/c/cea234bb214b17d004dfdccce4491e6ff57c96ee"},{"url":"https://git.kernel.org/stable/c/3678cf67ff7136db1dd3bf63c361650db5d92889"},{"url":"https://git.kernel.org/stable/c/d4c34782b6d7b1e68d18d9549451b19433bd4c6c"},{"url":"https://git.kernel.org/stable/c/e293c773c13b830cdc251f155df2254981abc320"},{"url":"https://git.kernel.org/stable/c/f4ff08fab66eb5c0b97e1a24edac052fb40bf5d7"},{"url":"https://git.kernel.org/stable/c/f23a4d6e07570826fe95023ca1aa96a011fa9f84"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T15:40:31.665Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.238","versionEndExcluding":"5.4.274"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.176","versionEndExcluding":"5.10.215"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.104","versionEndExcluding":"5.15.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.21","versionEndExcluding":"6.1.84"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.6.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.7.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.8.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.9"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