CVE-2022-49755 (GCVE-0-2022-49755)
Vulnerability from cvelistv5
Published
2025-03-27 16:43
Modified
2025-05-04 08:44
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait While performing fast composition switch, there is a possibility that the process of ffs_ep0_write/ffs_ep0_read get into a race condition due to ep0req being freed up from functionfs_unbind. Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't bounded so it can go ahead and mark the ep0req to NULL, and since there is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free. Fix this by making a serialized execution between the two functions using a mutex_lock(ffs->mutex).
References
Impacted products
Vendor Product Version
Linux Linux Version: ddf8abd2599491cbad959c700b90ba72a5dce8d0
Version: ddf8abd2599491cbad959c700b90ba72a5dce8d0
Version: ddf8abd2599491cbad959c700b90ba72a5dce8d0
Version: ddf8abd2599491cbad959c700b90ba72a5dce8d0
Version: ddf8abd2599491cbad959c700b90ba72a5dce8d0
Version: ddf8abd2599491cbad959c700b90ba72a5dce8d0
Version: ddf8abd2599491cbad959c700b90ba72a5dce8d0
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\"6dd9ea05534f323668db94fcc2726c7a84547e78\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ddf8abd2599491cbad959c700b90ba72a5dce8d0\", \"lessThan\": \"ae8e136bcaae96163b5821984de1036efc9abb1a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ddf8abd2599491cbad959c700b90ba72a5dce8d0\", \"lessThan\": \"6aee197b7fbcd61596a78b47d553f2f99111f217\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ddf8abd2599491cbad959c700b90ba72a5dce8d0\", \"lessThan\": \"6a19da111057f69214b97c62fb0ac59023970850\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/usb/gadget/function/f_fs.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.35\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.35\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.305\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.272\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.231\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.166\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.91\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/usb/gadget/function/f_fs.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2\"}, {\"url\": \"https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4\"}, {\"url\": \"https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064\"}, {\"url\": \"https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78\"}, {\"url\": \"https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a\"}, {\"url\": \"https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217\"}, {\"url\": \"https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait\\n\\nWhile performing fast composition switch, there is a possibility that the\\nprocess of ffs_ep0_write/ffs_ep0_read get into a race condition\\ndue to ep0req being freed up from functionfs_unbind.\\n\\nConsider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait\\nby taking a lock \u0026ffs-\u003eev.waitq.lock. However, the functionfs_unbind isn\u0027t\\nbounded so it can go ahead and mark the ep0req to NULL, and since there\\nis no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.\\n\\nFix this by making a serialized execution between the two functions using\\na mutex_lock(ffs-\u003emutex).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.305\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.272\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.231\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.166\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.91\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.9\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"2.6.35\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:44:41.827Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49755\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:44:41.827Z\", \"dateReserved\": \"2025-03-27T16:39:17.988Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-03-27T16:43:02.950Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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