CVE-2026-74507 (GCVE-0-2026-74507)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:38
VLAI
Title
Bluetooth: HIDP: validate numbered report payloads
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: validate numbered report payloads When hidp_get_raw_report() waits for a numbered report, hidp_process_data() compares the expected report number with skb->data[0]. A connected HIDP peer can reply with only a DATA transaction header, leaving the skb empty after the header is removed. KMSAN reports an uninitialized-value use in hidp_session_run(), with the value originating in __alloc_skb() through vhci_write(). The transaction header checks remove the empty-frame reports, but this report remains until the payload check is added. The comparison can also consume a peer-controlled byte beyond the declared L2CAP PDU. A DATA | FEATURE response followed by an extra 0x01 byte made the current code accept that byte as report ID 1 and complete HIDIOCGFEATURE with a zero-byte result. With this change the malformed response is rejected with -EIO, while a subsequent valid response still succeeds. Require a payload byte before comparing a numbered report ID. Unnumbered reports continue to accept an empty payload.
Severity
7.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0ff1731a1ae51e8e48cd559d70db536281c47f8e , < 011bf4350d941f1995b2bd4b815ee206cacf2b8e (git)
Affected: 0ff1731a1ae51e8e48cd559d70db536281c47f8e , < 689d8bb7fee96b7196b572b015b6055c6616ce0c (git)
Affected: 0ff1731a1ae51e8e48cd559d70db536281c47f8e , < c73beb320f5705e508bf7d385b8cc5ef8d9c8b69 (git)
Affected: 0ff1731a1ae51e8e48cd559d70db536281c47f8e , < b7ad105d46acd828e424454815e4cd31069e047a (git)
Affected: 0ff1731a1ae51e8e48cd559d70db536281c47f8e , < 7e7162427659b70ea17cd41b1f79e2e64c246690 (git)
Affected: 0ff1731a1ae51e8e48cd559d70db536281c47f8e , < 27cc0e603355c585f1e5da8398faa4d36d498188 (git)
Affected: 0ff1731a1ae51e8e48cd559d70db536281c47f8e , < 9c841f59e10b5d75c398a3fc6b2da448d2a2276b (git)
Affected: 0ff1731a1ae51e8e48cd559d70db536281c47f8e , < 34f53d27b81a16a02828c8fdfa4e02badc326f17 (git)
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Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (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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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: validate numbered report payloads\n\nWhen hidp_get_raw_report() waits for a numbered report,\nhidp_process_data() compares the expected report number with skb-\u003edata[0].\nA connected HIDP peer can reply with only a DATA transaction header,\nleaving the skb empty after the header is removed.\n\nKMSAN reports an uninitialized-value use in hidp_session_run(), with the\nvalue originating in __alloc_skb() through vhci_write(). The transaction\nheader checks remove the empty-frame reports, but this report remains until\nthe payload check is added.\n\nThe comparison can also consume a peer-controlled byte beyond the declared\nL2CAP PDU. A DATA | FEATURE response followed by an extra 0x01 byte made\nthe current code accept that byte as report ID 1 and complete\nHIDIOCGFEATURE with a zero-byte result. With this change the malformed\nresponse is rejected with -EIO, while a subsequent valid response still\nsucceeds.\n\nRequire a payload byte before comparing a numbered report ID. Unnumbered\nreports continue to accept an empty payload."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The flaw is reached when a connected Bluetooth HIDP peer sends crafted DATA frames over the established L2CAP control channel; Bluetooth is an adjacent wireless vector, not local syscall/ioctl or physical USB access.\nAC:L - The malicious peer receives the host GET_REPORT and can deterministically reply with a header-only DATA frame or a malformed numbered-report payload; no race or rare layout conditions beyond an active HIDP session are required.\nPR:N - Exploitation is performed by the remote Bluetooth HIDP peer sending malicious protocol data; the attacker needs no local account, capabilities, or init-namespace root on the victim host.\nUI:N - Once a HIDP session exists, the peer can trigger the bug by answering host-initiated GET_REPORT requests from HIDIOCGFEATURE or kernel HID probe I/O without any additional victim action at exploit time.\nS:U - Impact is confined to kernel Bluetooth HIDP/hidraw handling on the victim host; it does not cross a VM, container, or IOMMU security boundary to affect a separate authority.\nC:H - With numbered reports, hidp_process_data() reads skb-\u003edata[0] when skb-\u003elen is zero or beyond the declared L2CAP PDU, causing an out-of-bounds/uninitialized heap read that may contain stale kernel memory.\nI:L - Accepting malformed numbered-report responses can complete HIDIOCGFEATURE with incorrect zero-length or attacker-chosen report-ID data, causing limited integrity impact on returned HID feature-report contents.\nA:N - The defect is an invalid payload-length check and uninitialized/OOB read during report matching; it does not cause a documented kernel oops, panic, hang, or repeatable denial of service."
            }
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        "dateUpdated": "2026-08-19T16:38:05.065Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2026-08-15T12:27:30.683Z",
    "dateReserved": "2026-08-15T05:44:03.908Z",
    "dateUpdated": "2026-08-19T16:38:05.065Z",
    "state": "PUBLISHED"
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      "date": "2026-08-28",
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      "cve": "CVE-2026-74507",
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    },
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The transaction\\nheader checks remove the empty-frame reports, but this report remains until\\nthe payload check is added.\\n\\nThe comparison can also consume a peer-controlled byte beyond the declared\\nL2CAP PDU. A DATA | FEATURE response followed by an extra 0x01 byte made\\nthe current code accept that byte as report ID 1 and complete\\nHIDIOCGFEATURE with a zero-byte result. With this change the malformed\\nresponse is rejected with -EIO, while a subsequent valid response still\\nsucceeds.\\n\\nRequire a payload byte before comparing a numbered report ID. Unnumbered\\nreports continue to accept an empty payload.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/hidp/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0ff1731a1ae51e8e48cd559d70db536281c47f8e\",\"lessThan\":\"011bf4350d941f1995b2bd4b815ee206cacf2b8e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ff1731a1ae51e8e48cd559d70db536281c47f8e\",\"lessThan\":\"689d8bb7fee96b7196b572b015b6055c6616ce0c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ff1731a1ae51e8e48cd559d70db536281c47f8e\",\"lessThan\":\"c73beb320f5705e508bf7d385b8cc5ef8d9c8b69\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ff1731a1ae51e8e48cd559d70db536281c47f8e\",\"lessThan\":\"b7ad105d46acd828e424454815e4cd31069e047a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ff1731a1ae51e8e48cd559d70db536281c47f8e\",\"lessThan\":\"7e7162427659b70ea17cd41b1f79e2e64c246690\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ff1731a1ae51e8e48cd559d70db536281c47f8e\",\"lessThan\":\"27cc0e603355c585f1e5da8398faa4d36d498188\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ff1731a1ae51e8e48cd559d70db536281c47f8e\",\"lessThan\":\"9c841f59e10b5d75c398a3fc6b2da448d2a2276b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0ff1731a1ae51e8e48cd559d70db536281c47f8e\",\"lessThan\":\"34f53d27b81a16a02828c8fdfa4e02badc326f17\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/hidp/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.39\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.39\",\"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:L/A:N\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":4.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/011bf4350d941f1995b2bd4b815ee206cacf2b8e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/27cc0e603355c585f1e5da8398faa4d36d498188\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/34f53d27b81a16a02828c8fdfa4e02badc326f17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/689d8bb7fee96b7196b572b015b6055c6616ce0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7e7162427659b70ea17cd41b1f79e2e64c246690\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c841f59e10b5d75c398a3fc6b2da448d2a2276b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7ad105d46acd828e424454815e4cd31069e047a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c73beb320f5705e508bf7d385b8cc5ef8d9c8b69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T08:23:49+00:00",
      "cve": "CVE-2026-74507",
      "id": "CVE-2026-74507",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: HIDP: validate numbered report payloads",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74507.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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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.