CVE-2024-26935 (GCVE-0-2024-26935)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:17 – Updated: 2025-05-04 12:55
VLAI?
Title
scsi: core: Fix unremoved procfs host directory regression
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 88c3d3bb6469cea929ac68fd326bdcbefcdfdd83 , < 0053f15d50d50c9312d8ab9c11e2e405812dfcac (git)
Affected: 68c665bb185037e7eb66fb792c61da9d7151e99c , < 5c2386ba80e779a92ec3bb64ccadbedd88f779b1 (git)
Affected: 2a764d55e938743efa7c2cba7305633bcf227f09 , < cea234bb214b17d004dfdccce4491e6ff57c96ee (git)
Affected: 7e0ae8667fcdd99d1756922e1140cac75f5fa279 , < 3678cf67ff7136db1dd3bf63c361650db5d92889 (git)
Affected: be03df3d4bfe7e8866d4aa43d62e648ffe884f5f , < d4c34782b6d7b1e68d18d9549451b19433bd4c6c (git)
Affected: be03df3d4bfe7e8866d4aa43d62e648ffe884f5f , < e293c773c13b830cdc251f155df2254981abc320 (git)
Affected: be03df3d4bfe7e8866d4aa43d62e648ffe884f5f , < f4ff08fab66eb5c0b97e1a24edac052fb40bf5d7 (git)
Affected: be03df3d4bfe7e8866d4aa43d62e648ffe884f5f , < f23a4d6e07570826fe95023ca1aa96a011fa9f84 (git)
Affected: 73f030d4ef6d1ad17f824a0a2eb637ef7a9c7d51 (git)
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    Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 5.4.274 , ≤ 5.4.* (semver)
Unaffected: 5.10.215 , ≤ 5.10.* (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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\"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.215\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.154\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/scsi/hosts.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\u0027s 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\u0027t happen. And that pattern happens to exist in some\\nerror paths, for example.\\n\\nSyzkaller causes that by using USB raw gadget device, error\u0027ing 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\u0027s 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 \u0027scsi/usb-storage\u0027 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.274\", \"versionStartIncluding\": \"5.4.238\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.215\", \"versionStartIncluding\": \"5.10.176\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"5.15.104\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.84\", \"versionStartIncluding\": \"6.1.21\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.3\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.2.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:00:08.276Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26935\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:00:08.276Z\", \"dateReserved\": \"2024-02-19T14:20:24.196Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:17:31.445Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.