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CVE-2022-50386 (GCVE-0-2022-50386)

Vulnerability from cvelistv5 – Published: 2025-09-18 13:33 – Updated: 2026-08-05 08:58
VLAI
Title
Bluetooth: L2CAP: Fix user-after-free
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix user-after-free This uses l2cap_chan_hold_unless_zero() after calling __l2cap_get_chan_blah() to prevent the following trace: Bluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref *kref) Bluetooth: chan 0000000023c4974d Bluetooth: parent 00000000ae861c08 ================================================================== BUG: KASAN: use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:191 [inline] BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:671 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x278/0x400 kernel/locking/mutex.c:729 Read of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8 (High)
CVSS:3.1/AV:A/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 2026-01-14 18:49 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 11e40d6c0823f699d8ad501e48d1c3ae4be386cd (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 843fc4e386dd84b806a7f07fb062d8c3a44e5364 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < d91fc2836562f299f34e361e089e9fe154da4f73 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 7d6f9cb24d2b2f6b6370eac074e2e6b1bafdad45 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 0c108cf3ad386e0084277093b55a351c49e0be27 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < d1e894f950ad48897d1a7cb05909ea29d8c3810e (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 6ffde6e03085874ae22263ff4cef4869f797e84f (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 15fc21695eb606bdc5d483b92118ee42610a952d (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 35fcbc4243aad7e7d020b7c1dfb14bb888b20a4f (git)
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Linux Linux Affected: 3.4
Unaffected: 0 , < 3.4 (semver)
Unaffected: 4.9.331 , ≤ 4.9.* (semver)
Unaffected: 4.14.296 , ≤ 4.14.* (semver)
Unaffected: 4.19.262 , ≤ 4.19.* (semver)
Unaffected: 5.4.220 , ≤ 5.4.* (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
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              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix user-after-free\n\nThis uses l2cap_chan_hold_unless_zero() after calling\n__l2cap_get_chan_blah() to prevent the following trace:\n\nBluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref\n*kref)\nBluetooth: chan 0000000023c4974d\nBluetooth: parent 00000000ae861c08\n==================================================================\nBUG: KASAN: use-after-free in __mutex_waiter_is_first\nkernel/locking/mutex.c:191 [inline]\nBUG: KASAN: use-after-free in __mutex_lock_common\nkernel/locking/mutex.c:671 [inline]\nBUG: KASAN: use-after-free in __mutex_lock+0x278/0x400\nkernel/locking/mutex.c:729\nRead of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389"
        }
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              "lang": "en",
              "value": "AV:A - The bug is in BR/EDR L2CAP signaling (`l2cap_connect_create_rsp`) reached via ACL frames from a Bluetooth peer (`l2cap_recv_acldata` \u2192 `l2cap_sig_channel`), so exploitation requires adjacent-network Bluetooth proximity.\nAC:L - A remote peer can send L2CAP_CONN_RSP/CREATE_CHAN_RSP while concurrently forcing channel teardown (disconnect/link drop), controlling both sides of the UAF race, so success does not depend on conditions outside attacker influence.\nPR:N - L2CAP connect responses are processed on the signaling CID for established ACL links at default BT_SECURITY_LOW/SDP without authentication or local privileges on the victim host.\nUI:N - No additional victim action is required beyond ordinary Bluetooth connection activity; a malicious adjacent device can trigger the path during normal connect/reconnect flows.\nS:U - This is a standard in-kernel L2CAP channel UAF that enables privilege impact only within the same kernel security authority, not a boundary crossing such as VM/IOMMU escape.\nC:H - Use-after-free of the `l2cap_chan` object allows reclaim and attacker-controlled contents, which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF enables heap spray and corruption of the freed channel/mutex-related state, providing a path to arbitrary write and control-flow hijacking in the kernel.\nA:H - The KASAN report shows a kernel UAF during `l2cap_chan_lock`, which can oops/panic the kernel even when not fully exploited for code execution."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/11e40d6c0823f699d8ad501e48d1c3ae4be386cd"
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        {
          "url": "https://git.kernel.org/stable/c/843fc4e386dd84b806a7f07fb062d8c3a44e5364"
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          "url": "https://git.kernel.org/stable/c/d91fc2836562f299f34e361e089e9fe154da4f73"
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      "title": "Bluetooth: L2CAP: Fix user-after-free",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50386",
    "datePublished": "2025-09-18T13:33:07.191Z",
    "dateReserved": "2025-09-17T14:53:06.997Z",
    "dateUpdated": "2026-08-05T08:58:30.414Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-50386",
      "date": "2026-09-16",
      "epss": "0.00357",
      "percentile": "0.29282"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50386\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-18T14:15:37.480\",\"lastModified\":\"2026-08-04T10:18:13.947\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: L2CAP: Fix user-after-free\\n\\nThis uses l2cap_chan_hold_unless_zero() after calling\\n__l2cap_get_chan_blah() to prevent the following trace:\\n\\nBluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref\\n*kref)\\nBluetooth: chan 0000000023c4974d\\nBluetooth: parent 00000000ae861c08\\n==================================================================\\nBUG: KASAN: use-after-free in __mutex_waiter_is_first\\nkernel/locking/mutex.c:191 [inline]\\nBUG: KASAN: use-after-free in __mutex_lock_common\\nkernel/locking/mutex.c:671 [inline]\\nBUG: KASAN: use-after-free in __mutex_lock+0x278/0x400\\nkernel/locking/mutex.c:729\\nRead of size 8 at addr ffff888006a49b08 by task 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T11:47:20+00:00",
      "cve": "CVE-2022-50386",
      "id": "CVE-2022-50386",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "913",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: Fix user-after-free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50386.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-29T02:21:30Z",
      "cve": "CVE-2022-50386",
      "id": "CVE-2022-50386",
      "initial_release_date": "2025-09-18T23:43:25Z",
      "product_status:known_affected": "465",
      "product_status:known_not_affected": "163",
      "product_status:recommended": "368",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50386",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50386.json",
      "version": "48"
    },
    "vulnrichment": {
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\"https://git.kernel.org/stable/c/d1e894f950ad48897d1a7cb05909ea29d8c3810e\"}, {\"url\": \"https://git.kernel.org/stable/c/6ffde6e03085874ae22263ff4cef4869f797e84f\"}, {\"url\": \"https://git.kernel.org/stable/c/15fc21695eb606bdc5d483b92118ee42610a952d\"}, {\"url\": \"https://git.kernel.org/stable/c/35fcbc4243aad7e7d020b7c1dfb14bb888b20a4f\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: L2CAP: Fix user-after-free\\n\\nThis uses l2cap_chan_hold_unless_zero() after calling\\n__l2cap_get_chan_blah() to prevent the following trace:\\n\\nBluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref\\n*kref)\\nBluetooth: chan 0000000023c4974d\\nBluetooth: parent 00000000ae861c08\\n==================================================================\\nBUG: KASAN: use-after-free in __mutex_waiter_is_first\\nkernel/locking/mutex.c:191 [inline]\\nBUG: KASAN: use-after-free in __mutex_lock_common\\nkernel/locking/mutex.c:671 [inline]\\nBUG: KASAN: use-after-free in __mutex_lock+0x278/0x400\\nkernel/locking/mutex.c:729\\nRead of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.331\", \"versionStartIncluding\": \"3.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.296\", \"versionStartIncluding\": \"3.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.262\", \"versionStartIncluding\": \"3.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.220\", \"versionStartIncluding\": \"3.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.150\", \"versionStartIncluding\": \"3.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.75\", \"versionStartIncluding\": \"3.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19.17\", \"versionStartIncluding\": \"3.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.3\", \"versionStartIncluding\": \"3.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"3.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T19:18:32.010Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-50386\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T19:18:32.010Z\", \"dateReserved\": \"2025-09-17T14:53:06.997Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-18T13:33:07.191Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.