CVE-2026-74540 (GCVE-0-2026-74540)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:38
VLAI
Title
Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a reference, but l2cap_le_connect_rsp() was left unprotected. Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup and l2cap_chan_put() on the exit path, consistent with other L2CAP response handlers.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f1496dee9cbde2a62821f4441dadb0d3360f60c3 , < 15d6c2367217a6a20b1abae9f38ded716bf620f1 (git)
Affected: f1496dee9cbde2a62821f4441dadb0d3360f60c3 , < 1818180fe12d6cec7a437bc59cde8efdf6b10250 (git)
Affected: f1496dee9cbde2a62821f4441dadb0d3360f60c3 , < 8325eafb38c3dee5af329266393763693d17381b (git)
Affected: f1496dee9cbde2a62821f4441dadb0d3360f60c3 , < fd4c1e301bdec60a40728ea37de531cbccda501a (git)
Affected: f1496dee9cbde2a62821f4441dadb0d3360f60c3 , < 522b730c62c53a1981604fd73524697fd347830d (git)
Affected: f1496dee9cbde2a62821f4441dadb0d3360f60c3 , < 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136 (git)
Affected: f1496dee9cbde2a62821f4441dadb0d3360f60c3 , < 09f447accc2570751e7d17f0dc0788b40d3edade (git)
Affected: f1496dee9cbde2a62821f4441dadb0d3360f60c3 , < c4740e7f23ff9a8210198d8b4703259e21b9f69d (git)
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Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp\n\nl2cap_le_connect_rsp() obtains a channel via\n__l2cap_get_chan_by_ident() but neither holds a reference nor uses\nl2cap_chan_hold_unless_zero() before locking and operating on it.\nA concurrent l2cap_chan_del() triggered by a remote disconnect can\nfree the channel between the lookup and l2cap_chan_lock(), causing\na use-after-free.\n\nThe BR/EDR counterpart l2cap_connect_rsp() and the sibling handler\nl2cap_le_command_rej() already use l2cap_chan_hold_unless_zero()\nto safely hold a reference, but l2cap_le_connect_rsp() was left\nunprotected.\n\nFix by adding l2cap_chan_hold_unless_zero() after the ident lookup\nand l2cap_chan_put() on the exit path, consistent with other L2CAP\nresponse handlers."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The vulnerability is reached when the kernel processes an incoming L2CAP LE Connect Response over an established Bluetooth LE ACL link (HCI ACL receive \u2192 l2cap_recv_acldata \u2192 l2cap_le_sig_channel \u2192 l2cap_le_connect_rsp), requiring radio proximity rather than routable Internet access.\nAC:L - The remote Bluetooth peer controls both sides of the race by sending L2CAP_LE_CONN_RSP while concurrently triggering channel teardown via L2CAP DISCONN_REQ or HCI disconnect, freeing the channel between __l2cap_get_chan_by_ident() and l2cap_chan_lock() without attacker-uncontrollable timing.\nPR:N - No local privileges on the victim are required; exploitation needs only a nearby attacker with an established LE Bluetooth connection sending crafted L2CAP signaling packets, with no root, CAP_NET_ADMIN, or user-namespace capability on the target host.\nUI:N - On phones, wearables, automotive, and IoT deployments, paired or background Bluetooth clients routinely auto-initiate L2CAP credit-based connections without per-attack user confirmation once an LE link is up, enabling trigger of the pending outgoing connect path.\nS:U - Impact is confined to kernel memory and privileges on the Bluetooth-connected host; there is no VM guest-to-host escape, sandbox breakout, or IOMMU/DMA boundary crossing, so security scope remains unchanged per kernel CVSS guidance.\nC:H - Use-after-free of heap-allocated struct l2cap_chan allows attacker-controlled reuse of freed slab memory, enabling disclosure of kernel heap contents and pointers through corrupted channel fields accessed after premature free.\nI:H - The UAF window writes channel state (ident, dcid, mtu, credits) and invokes chan-\u003eops function pointers (ready, teardown) on freed memory, enabling heap spraying and control-flow hijack for arbitrary kernel code execution.\nA:H - Operating on a freed l2cap_chan can immediately kernel-oops or panic from corrupt mutex/state during lock/unlock and callback dispatch; UAF in softirq L2CAP processing inherently threatens full system availability."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/1818180fe12d6cec7a437bc59cde8efdf6b10250"
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        {
          "url": "https://git.kernel.org/stable/c/8325eafb38c3dee5af329266393763693d17381b"
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      "title": "Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp",
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    "datePublished": "2026-08-15T12:27:51.522Z",
    "dateReserved": "2026-08-15T05:44:03.913Z",
    "dateUpdated": "2026-08-19T16:38:32.306Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74540",
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      "title": "Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74540.json",
      "version": "1"
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l2cap_chan_hold_unless_zero() after the ident lookup\\nand l2cap_chan_put() on the exit path, consistent with other L2CAP\\nresponse handlers.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/l2cap_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\"lessThan\":\"15d6c2367217a6a20b1abae9f38ded716bf620f1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\"lessThan\":\"1818180fe12d6cec7a437bc59cde8efdf6b10250\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\"lessThan\":\"8325eafb38c3dee5af329266393763693d17381b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\"lessThan\":\"fd4c1e301bdec60a40728ea37de531cbccda501a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\"lessThan\":\"522b730c62c53a1981604fd73524697fd347830d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\"lessThan\":\"58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\"lessThan\":\"09f447accc2570751e7d17f0dc0788b40d3edade\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\"lessThan\":\"c4740e7f23ff9a8210198d8b4703259e21b9f69d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/l2cap_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/09f447accc2570751e7d17f0dc0788b40d3edade\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/15d6c2367217a6a20b1abae9f38ded716bf620f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1818180fe12d6cec7a437bc59cde8efdf6b10250\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/522b730c62c53a1981604fd73524697fd347830d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8325eafb38c3dee5af329266393763693d17381b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4740e7f23ff9a8210198d8b4703259e21b9f69d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd4c1e301bdec60a40728ea37de531cbccda501a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T11:33:22+00:00",
      "cve": "CVE-2026-74540",
      "id": "CVE-2026-74540",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74540.json",
      "version": "3"
    }
  }
}



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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

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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.
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  • 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.