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CVE-2024-39495 (GCVE-0-2024-39495)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2026-08-05 11:33
VLAI
Title
greybus: Fix use-after-free bug in gb_interface_release due to race condition.
Summary
In the Linux kernel, the following vulnerability has been resolved: greybus: Fix use-after-free bug in gb_interface_release due to race condition. In gb_interface_create, &intf->mode_switch_completion is bound with gb_interface_mode_switch_work. Then it will be started by gb_interface_request_mode_switch. Here is the relevant code. if (!queue_work(system_long_wq, &intf->mode_switch_work)) { ... } If we call gb_interface_release to make cleanup, there may be an unfinished work. This function will call kfree to free the object "intf". However, if gb_interface_mode_switch_work is scheduled to run after kfree, it may cause use-after-free error as gb_interface_mode_switch_work will use the object "intf". The possible execution flow that may lead to the issue is as follows: CPU0 CPU1 | gb_interface_create | gb_interface_request_mode_switch gb_interface_release | kfree(intf) (free) | | gb_interface_mode_switch_work | mutex_lock(&intf->mutex) (use) Fix it by canceling the work before kfree.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-16 04:02 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 55742d2a071a569bf20f90d37b1b5b8a25a3f882 , < 74cd0a421896b2e07eafe7da4275302bfecef201 (git)
Affected: 55742d2a071a569bf20f90d37b1b5b8a25a3f882 , < 2b6bb0b4abfd79b8698ee161bb73c0936a2aaf83 (git)
Affected: 55742d2a071a569bf20f90d37b1b5b8a25a3f882 , < fb071f5c75d4b1c177824de74ee75f9dd34123b9 (git)
Affected: 55742d2a071a569bf20f90d37b1b5b8a25a3f882 , < 9a733d69a4a59c2d08620e6589d823c24be773dc (git)
Affected: 55742d2a071a569bf20f90d37b1b5b8a25a3f882 , < 0b8fba38bdfb848fac52e71270b2aa3538c996ea (git)
Affected: 55742d2a071a569bf20f90d37b1b5b8a25a3f882 , < 03ea2b129344152157418929f06726989efc0445 (git)
Affected: 55742d2a071a569bf20f90d37b1b5b8a25a3f882 , < 5c9c5d7f26acc2c669c1dcf57d1bb43ee99220ce (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (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: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
linux linux_kernel Affected: 0 , < 74cd0a421896 (git)
Affected: 1da177e4c3f4 , < 2b6bb0b4abfd (git)
Affected: 1da177e4c3f4 , < fb071f5c75d4 (git)
Affected: 1da177e4c3f4 , < 9a733d69a4a5 (git)
Affected: 1da177e4c3f4 , < 0b8fba38bdfb (git)
Affected: 1da177e4c3f4 , < 03ea2b129344 (git)
Affected: 1da177e4c3f4 , < 5c9c5d7f26ac (git)
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngreybus: Fix use-after-free bug in gb_interface_release due to race condition.\n\nIn gb_interface_create, \u0026intf-\u003emode_switch_completion is bound with\ngb_interface_mode_switch_work. Then it will be started by\ngb_interface_request_mode_switch. Here is the relevant code.\nif (!queue_work(system_long_wq, \u0026intf-\u003emode_switch_work)) {\n\t...\n}\n\nIf we call gb_interface_release to make cleanup, there may be an\nunfinished work. This function will call kfree to free the object\n\"intf\". However, if gb_interface_mode_switch_work is scheduled to\nrun after kfree, it may cause use-after-free error as\ngb_interface_mode_switch_work will use the object \"intf\".\nThe possible execution flow that may lead to the issue is as follows:\n\nCPU0                            CPU1\n\n                            |   gb_interface_create\n                            |   gb_interface_request_mode_switch\ngb_interface_release        |\nkfree(intf) (free)          |\n                            |   gb_interface_mode_switch_work\n                            |   mutex_lock(\u0026intf-\u003emutex) (use)\n\nFix it by canceling the work before kfree."
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              "value": "AV:L - The attacker-controlled side of the race is the FW_MGMT_IOC_MODE_SWITCH ioctl on the /dev/gb-fw-mgmt-N character device (drivers/staging/greybus/fw-management.c:503), the sole caller of gb_interface_request_mode_switch(). Greybus is a local bus (USB/UART/serdev transport), not remotely reachable, so exploitation requires local access to the system.\nAC:L - The attacker directly controls the work-queueing side via the ioctl and can retry it in a tight loop indefinitely, while the free side (interface refcount drop via module removal / SVC teardown) can be induced repeatedly by hot-unplug or the 2-second mode-switch timeout path that calls gb_interface_deactivate(). Heap grooming of the ~1KB gb_interface allocation is standard, so the attacker creates and wins the race himself rather than depending on conditions outside his control.\nPR:L - fw_mgmt_ioctl() and fw_mgmt_ioctl_unlocked() contain no capable() or CAP_* check at all; the only gate is the permission on the /dev/gb-fw-mgmt-N node, which on greybus-based embedded/mobile deployments is routinely granted to a non-root firmware-management service or group. An unprivileged user holding a descriptor to that node can drive the entire path.\nUI:N - No victim action is needed \u2014 the attacker issues the ioctl himself, and the freeing side is driven by SVC module-removed events or the mode-switch timeout that the attacker can provoke. No file must be opened and no filesystem mounted by another user.\nS:U - The use-after-free corrupts kernel heap memory and is exploited within the same kernel security authority; there is no hypervisor, IOMMU, or sandbox boundary crossed. This is standard local kernel privilege escalation.\nC:H - The freed gb_interface can be reclaimed and sprayed by the attacker, after which gb_interface_mode_switch_work() reads intf-\u003econtrol, intf-\u003eenabled and walks intf-\u003ebundles, giving a controlled-pointer dereference usable as an arbitrary kernel-memory read primitive. Full disclosure of kernel memory, including credentials and KASLR-defeating pointers, is achievable.\nI:H - mutex_lock(\u0026intf-\u003emutex) on the freed object writes into attacker-controlled reclaimed memory, and gb_bundle_destroy() iterating the stale intf-\u003ebundles list performs list-unlink writes through attacker-supplied pointers. These are classic UAF write primitives that can be escalated to control-flow hijack and full kernel compromise.\nA:H - Even without successful reclaim, the work item dereferences and takes a mutex on freed memory, producing a kernel oops or panic. Any use-after-free of this kind reliably crashes the system, and the ioctl can be repeated to trigger it at will."
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However, if gb_interface_mode_switch_work is scheduled to\\nrun after kfree, it may cause use-after-free error as\\ngb_interface_mode_switch_work will use the object \\\"intf\\\".\\nThe possible execution flow that may lead to the issue is as follows:\\n\\nCPU0                            CPU1\\n\\n                            |   gb_interface_create\\n                            |   gb_interface_request_mode_switch\\ngb_interface_release        |\\nkfree(intf) (free)          |\\n                            |   gb_interface_mode_switch_work\\n                            |   mutex_lock(\u0026intf-\u003emutex) (use)\\n\\nFix it by canceling the work before kfree.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: greybus: corrigi\u00f3 el error de use-after-free en gb_interface_release debido a la condici\u00f3n de ejecuci\u00f3n. En gb_interface_create, \u0026amp;intf-\u0026gt;mode_switch_completion est\u00e1 vinculado con gb_interface_mode_switch_work. Luego lo iniciar\u00e1 gb_interface_request_mode_switch. Aqu\u00ed est\u00e1 el c\u00f3digo relevante. if (!queue_work(system_long_wq, \u0026amp;intf-\u0026gt;mode_switch_work)) { ... } Si llamamos a gb_interface_release para realizar la limpieza, es posible que haya un trabajo sin terminar. Esta funci\u00f3n llamar\u00e1 a kfree para liberar el objeto \\\"intf\\\". Sin embargo, si gb_interface_mode_switch_work est\u00e1 programado para ejecutarse despu\u00e9s de kfree, puede causar un error de use-after-free ya que gb_interface_mode_switch_work usar\u00e1 el objeto \\\"intf\\\". El posible flujo de ejecuci\u00f3n que puede provocar el problema es el siguiente: CPU0 CPU1 | gb_interface_create | gb_interface_request_mode_switch gb_interface_release | kfree(intf) (gratis) | | gb_interface_mode_switch_work | mutex_lock(\u0026amp;intf-\u0026gt;mutex) (uso) Solucionarlo cancelando el trabajo antes de kfree.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/greybus/interface.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"55742d2a071a569bf20f90d37b1b5b8a25a3f882\",\"lessThan\":\"74cd0a421896b2e07eafe7da4275302bfecef201\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"55742d2a071a569bf20f90d37b1b5b8a25a3f882\",\"lessThan\":\"2b6bb0b4abfd79b8698ee161bb73c0936a2aaf83\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"55742d2a071a569bf20f90d37b1b5b8a25a3f882\",\"lessThan\":\"fb071f5c75d4b1c177824de74ee75f9dd34123b9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"55742d2a071a569bf20f90d37b1b5b8a25a3f882\",\"lessThan\":\"9a733d69a4a59c2d08620e6589d823c24be773dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"55742d2a071a569bf20f90d37b1b5b8a25a3f882\",\"lessThan\":\"0b8fba38bdfb848fac52e71270b2aa3538c996ea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"55742d2a071a569bf20f90d37b1b5b8a25a3f882\",\"lessThan\":\"03ea2b129344152157418929f06726989efc0445\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"55742d2a071a569bf20f90d37b1b5b8a25a3f882\",\"lessThan\":\"5c9c5d7f26acc2c669c1dcf57d1bb43ee99220ce\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/greybus/interface.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.279\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.221\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.162\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.95\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.35\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9.6\",\"lessThanOrEqual\":\"6.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.10\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"affectedData\":[{\"vendor\":\"linux\",\"product\":\"linux_kernel\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\"],\"versions\":[{\"version\":\"0\",\"lessThan\":\"74cd0a421896\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f4\",\"lessThan\":\"2b6bb0b4abfd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f4\",\"lessThan\":\"fb071f5c75d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f4\",\"lessThan\":\"9a733d69a4a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f4\",\"lessThan\":\"0b8fba38bdfb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f4\",\"lessThan\":\"03ea2b129344\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f4\",\"lessThan\":\"5c9c5d7f26ac\",\"versionType\":\"git\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-08-16T04:02:11.550513Z\",\"id\":\"CVE-2024-39495\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-01-13T22:56:42+00:00",
      "cve": "CVE-2024-39495",
      "id": "CVE-2024-39495",
      "initial_release_date": "2024-07-12T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: greybus: Fix use-after-free bug in gb_interface_release due to race condition",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-39495.json",
      "version": "3"
    },
    "vulnrichment": {
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\u0026intf-\u003emode_switch_completion is bound with\\ngb_interface_mode_switch_work. Then it will be started by\\ngb_interface_request_mode_switch. Here is the relevant code.\\nif (!queue_work(system_long_wq, \u0026intf-\u003emode_switch_work)) {\\n\\t...\\n}\\n\\nIf we call gb_interface_release to make cleanup, there may be an\\nunfinished work. This function will call kfree to free the object\\n\\\"intf\\\". However, if gb_interface_mode_switch_work is scheduled to\\nrun after kfree, it may cause use-after-free error as\\ngb_interface_mode_switch_work will use the object \\\"intf\\\".\\nThe possible execution flow that may lead to the issue is as follows:\\n\\nCPU0                            CPU1\\n\\n                            |   gb_interface_create\\n                            |   gb_interface_request_mode_switch\\ngb_interface_release        |\\nkfree(intf) (free)          |\\n                            |   gb_interface_mode_switch_work\\n                            |   mutex_lock(\u0026intf-\u003emutex) (use)\\n\\nFix it by canceling the work before kfree.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.279\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.221\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.162\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.95\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.35\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.6\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:36:47.683Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-39495\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:36:47.683Z\", \"dateReserved\": \"2024-06-25T14:23:23.751Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:20:31.022Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.