CVE-2024-36894 (GCVE-0-2024-36894)

Vulnerability from cvelistv5 – Published: 2024-05-30 15:28 – Updated: 2025-11-03 21:55
VLAI?
Title
usb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete FFS based applications can utilize the aio_cancel() callback to dequeue pending USB requests submitted to the UDC. There is a scenario where the FFS application issues an AIO cancel call, while the UDC is handling a soft disconnect. For a DWC3 based implementation, the callstack looks like the following: DWC3 Gadget FFS Application dwc3_gadget_soft_disconnect() ... --> dwc3_stop_active_transfers() --> dwc3_gadget_giveback(-ESHUTDOWN) --> ffs_epfile_async_io_complete() ffs_aio_cancel() --> usb_ep_free_request() --> usb_ep_dequeue() There is currently no locking implemented between the AIO completion handler and AIO cancel, so the issue occurs if the completion routine is running in parallel to an AIO cancel call coming from the FFS application. As the completion call frees the USB request (io_data->req) the FFS application is also referencing it for the usb_ep_dequeue() call. This can lead to accessing a stale/hanging pointer. commit b566d38857fc ("usb: gadget: f_fs: use io_data->status consistently") relocated the usb_ep_free_request() into ffs_epfile_async_io_complete(). However, in order to properly implement locking to mitigate this issue, the spinlock can't be added to ffs_epfile_async_io_complete(), as usb_ep_dequeue() (if successfully dequeuing a USB request) will call the function driver's completion handler in the same context. Hence, leading into a deadlock. Fix this issue by moving the usb_ep_free_request() back to ffs_user_copy_worker(), and ensuring that it explicitly sets io_data->req to NULL after freeing it within the ffs->eps_lock. This resolves the race condition above, as the ffs_aio_cancel() routine will not continue attempting to dequeue a request that has already been freed, or the ffs_user_copy_work() not freeing the USB request until the AIO cancel is done referencing it. This fix depends on commit b566d38857fc ("usb: gadget: f_fs: use io_data->status consistently")
Severity ?
5.6 (Medium)
CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2e4c7553cd6f9c68bb741582dcb614edcbeca70f , < f71a53148ce34898fef099b75386a3a9f4449311 (git)
Affected: 2e4c7553cd6f9c68bb741582dcb614edcbeca70f , < 9e72ef59cbe61cd1243857a6418ca92104275867 (git)
Affected: 2e4c7553cd6f9c68bb741582dcb614edcbeca70f , < e500b1c4e29ad0bd1c1332a1eaea2913627a92dd (git)
Affected: 2e4c7553cd6f9c68bb741582dcb614edcbeca70f , < 3613e5023f09b3308545e9d1acda86017ebd418a (git)
Affected: 2e4c7553cd6f9c68bb741582dcb614edcbeca70f , < a0fdccb1c9e027e3195f947f61aa87d6d0d2ea14 (git)
Affected: 2e4c7553cd6f9c68bb741582dcb614edcbeca70f , < 73c05ad46bb4fbbdb346004651576d1c8dbcffbb (git)
Affected: 2e4c7553cd6f9c68bb741582dcb614edcbeca70f , < d7461830823242702f5d84084bcccb25159003f4 (git)
Affected: 2e4c7553cd6f9c68bb741582dcb614edcbeca70f , < 24729b307eefcd7c476065cd7351c1a018082c19 (git)
Create a notification for this product.
    Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 4.19.317 , ≤ 4.19.* (semver)
Unaffected: 5.4.279 , ≤ 5.4.* (semver)
Unaffected: 5.10.221 , ≤ 5.10.* (semver)
Unaffected: 5.15.162 , ≤ 5.15.* (semver)
Unaffected: 6.1.95 , ≤ 6.1.* (semver)
Unaffected: 6.6.31 , ≤ 6.6.* (semver)
Unaffected: 6.8.10 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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\"https://git.kernel.org/stable/c/24729b307eefcd7c476065cd7351c1a018082c19\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T21:55:22.274Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.6, \"attackVector\": \"PHYSICAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-36894\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-03T15:53:00.949597Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"2e4c7553cd6f\", \"lessThan\": \"73c05ad46bb4\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"2e4c7553cd6f\", \"lessThan\": \"d74618308232\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"2e4c7553cd6f\", \"lessThan\": \"24729b307eef\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"2e4c7553cd6f\", 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\"custom\", \"lessThanOrEqual\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"5.15.162\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.16\"}, {\"status\": \"unaffected\", \"version\": \"6.1.95\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.2\"}, {\"status\": \"unaffected\", \"version\": \"6.6.31\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.7\"}, {\"status\": \"unaffected\", \"version\": \"6.8.10\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.9\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"*\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-362\", \"description\": \"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-03T16:04:02.070Z\"}}], \"cna\": {\"title\": \"usb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2e4c7553cd6f9c68bb741582dcb614edcbeca70f\", \"lessThan\": \"f71a53148ce34898fef099b75386a3a9f4449311\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2e4c7553cd6f9c68bb741582dcb614edcbeca70f\", \"lessThan\": \"9e72ef59cbe61cd1243857a6418ca92104275867\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2e4c7553cd6f9c68bb741582dcb614edcbeca70f\", \"lessThan\": \"e500b1c4e29ad0bd1c1332a1eaea2913627a92dd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2e4c7553cd6f9c68bb741582dcb614edcbeca70f\", \"lessThan\": \"3613e5023f09b3308545e9d1acda86017ebd418a\", \"versionType\": \"git\"}, 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kernel, the following vulnerability has been resolved:\\n\\nusb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete\\n\\nFFS based applications can utilize the aio_cancel() callback to dequeue\\npending USB requests submitted to the UDC.  There is a scenario where the\\nFFS application issues an AIO cancel call, while the UDC is handling a\\nsoft disconnect.  For a DWC3 based implementation, the callstack looks\\nlike the following:\\n\\n    DWC3 Gadget                               FFS Application\\ndwc3_gadget_soft_disconnect()              ...\\n  --\u003e dwc3_stop_active_transfers()\\n    --\u003e dwc3_gadget_giveback(-ESHUTDOWN)\\n      --\u003e ffs_epfile_async_io_complete()   ffs_aio_cancel()\\n        --\u003e usb_ep_free_request()            --\u003e usb_ep_dequeue()\\n\\nThere is currently no locking implemented between the AIO completion\\nhandler and AIO cancel, so the issue occurs if the completion routine is\\nrunning in parallel to an AIO cancel call coming from the FFS application.\\nAs the completion call frees the USB request (io_data-\u003ereq) the FFS\\napplication is also referencing it for the usb_ep_dequeue() call.  This can\\nlead to accessing a stale/hanging pointer.\\n\\ncommit b566d38857fc (\\\"usb: gadget: f_fs: use io_data-\u003estatus consistently\\\")\\nrelocated the usb_ep_free_request() into ffs_epfile_async_io_complete().\\nHowever, in order to properly implement locking to mitigate this issue, the\\nspinlock can\u0027t be added to ffs_epfile_async_io_complete(), as\\nusb_ep_dequeue() (if successfully dequeuing a USB request) will call the\\nfunction driver\u0027s completion handler in the same context.  Hence, leading\\ninto a deadlock.\\n\\nFix this issue by moving the usb_ep_free_request() back to\\nffs_user_copy_worker(), and ensuring that it explicitly sets io_data-\u003ereq\\nto NULL after freeing it within the ffs-\u003eeps_lock.  This resolves the race\\ncondition above, as the ffs_aio_cancel() routine will not continue\\nattempting to dequeue a request that has already been freed, or the\\nffs_user_copy_work() not freeing the USB request until the AIO cancel is\\ndone referencing it.\\n\\nThis fix depends on\\n  commit b566d38857fc (\\\"usb: gadget: f_fs: use io_data-\u003estatus\\n  consistently\\\")\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.317\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.279\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.221\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.162\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.95\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.31\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.10\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"3.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:11:34.535Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-36894\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T21:55:22.274Z\", \"dateReserved\": \"2024-05-30T15:25:07.066Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-30T15:28:59.689Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • 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.