CVE-2024-26935 (GCVE-0-2024-26935)
Vulnerability from cvelistv5
Published
2024-05-01 05:17
Modified
2026-05-23 15:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: core: Fix unremoved procfs host directory regression Commit fc663711b944 ("scsi: core: Remove the /proc/scsi/${proc_name} directory earlier") fixed a bug related to modules loading/unloading, by adding a call to scsi_proc_hostdir_rm() on scsi_remove_host(). But that led to a potential duplicate call to the hostdir_rm() routine, since it's also called from scsi_host_dev_release(). That triggered a regression report, which was then fixed by commit be03df3d4bfe ("scsi: core: Fix a procfs host directory removal regression"). The fix just dropped the hostdir_rm() call from dev_release(). But it happens that this proc directory is created on scsi_host_alloc(), and that function "pairs" with scsi_host_dev_release(), while scsi_remove_host() pairs with scsi_add_host(). In other words, it seems the reason for removing the proc directory on dev_release() was meant to cover cases in which a SCSI host structure was allocated, but the call to scsi_add_host() didn't happen. And that pattern happens to exist in some error paths, for example. Syzkaller causes that by using USB raw gadget device, error'ing on usb-storage driver, at usb_stor_probe2(). By checking that path, we can see that the BadDevice label leads to a scsi_host_put() after a SCSI host allocation, but there's no call to scsi_add_host() in such path. That leads to messages like this in dmesg (and a leak of the SCSI host proc structure): usb-storage 4-1:87.51: USB Mass Storage device detected proc_dir_entry 'scsi/usb-storage' already registered WARNING: CPU: 1 PID: 3519 at fs/proc/generic.c:377 proc_register+0x347/0x4e0 fs/proc/generic.c:376 The proper fix seems to still call scsi_proc_hostdir_rm() on dev_release(), but guard that with the state check for SHOST_CREATED; there is even a comment in scsi_host_dev_release() detailing that: such conditional is meant for cases where the SCSI host was allocated but there was no calls to {add,remove}_host(), like the usb-storage case. This is what we propose here and with that, the error path of usb-storage does not trigger the warning anymore.
References
Impacted products
Vendor Product Version
Linux Linux Version: 88c3d3bb6469cea929ac68fd326bdcbefcdfdd83
Version: 68c665bb185037e7eb66fb792c61da9d7151e99c
Version: 2a764d55e938743efa7c2cba7305633bcf227f09
Version: 7e0ae8667fcdd99d1756922e1140cac75f5fa279
Version: be03df3d4bfe7e8866d4aa43d62e648ffe884f5f
Version: be03df3d4bfe7e8866d4aa43d62e648ffe884f5f
Version: be03df3d4bfe7e8866d4aa43d62e648ffe884f5f
Version: be03df3d4bfe7e8866d4aa43d62e648ffe884f5f
Version: 73f030d4ef6d1ad17f824a0a2eb637ef7a9c7d51
Version: 5.4.238   ≤
Version: 5.10.176   ≤
Version: 5.15.104   ≤
Version: 6.1.21   ≤
Version: 6.2.8   ≤
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    "dateUpdated": "2026-05-23T15:40:31.665Z",
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