{"id":"CVE-2026-43047","state":"PUBLISHED","title":"HID: multitouch: Check to ensure report responses match the request","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: multitouch: Check to ensure report responses match the request\n\nIt is possible for a malicious (or clumsy) device to respond to a\nspecific report's feature request using a completely different report\nID.  This can cause confusion in the HID core resulting in nasty\nside-effects such as OOB writes.\n\nAdd a check to ensure that the report ID in the response, matches the\none that was requested.  If it doesn't, omit reporting the raw event and\nreturn early.","publishedAt":"2026-05-01T14:15:42.562Z","updatedAt":"2026-10-19T19:06:11.151Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"516da3f25cfe18643835af1cf09b0e9ffc36c383","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"a61163daf8a90b4a7ef154d5fc9c525f665734e3","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"74c6015375d8b9bc1b1eb79f20636c8e894bcad7","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"c7a27bb4d0f6573ca0f9c7ef0b63291486239190","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"6a4acd3e86fe5584050c213d95147eba33856033","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"7f66fdbc077faed3b52519228d21d81979e92249","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"2edc92f89eee328b5be5706b5d431bf90669e9c0","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"e716edafedad4952fe3a4a273d2e039a84e8681a","versionType":"git"},{"version":"fee906f035f0bd18ff12d84d58766c44a2ab0918","status":"affected","versionType":"git"},{"version":"4.3.6","status":"affected","lessThan":"4.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-multitouch.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.4","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-multitouch.c"]}],"references":["https://git.kernel.org/stable/c/516da3f25cfe18643835af1cf09b0e9ffc36c383","https://git.kernel.org/stable/c/a61163daf8a90b4a7ef154d5fc9c525f665734e3","https://git.kernel.org/stable/c/74c6015375d8b9bc1b1eb79f20636c8e894bcad7","https://git.kernel.org/stable/c/c7a27bb4d0f6573ca0f9c7ef0b63291486239190","https://git.kernel.org/stable/c/6a4acd3e86fe5584050c213d95147eba33856033","https://git.kernel.org/stable/c/7f66fdbc077faed3b52519228d21d81979e92249","https://git.kernel.org/stable/c/2edc92f89eee328b5be5706b5d431bf90669e9c0","https://git.kernel.org/stable/c/e716edafedad4952fe3a4a273d2e039a84e8681a"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43047.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43047","state":"PUBLISHED","datePublished":"2026-05-01T14:15:42.562Z","dateUpdated":"2026-10-19T19:06:11.151Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.979Z"},"containers":{"cna":{"title":"HID: multitouch: Check to ensure report responses match the request","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: multitouch: Check to ensure report responses match the request\n\nIt is possible for a malicious (or clumsy) device to respond to a\nspecific report's feature request using a completely different report\nID.  This can cause confusion in the HID core resulting in nasty\nside-effects such as OOB writes.\n\nAdd a check to ensure that the report ID in the response, matches the\none that was requested.  If it doesn't, omit reporting the raw event and\nreturn early."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"516da3f25cfe18643835af1cf09b0e9ffc36c383","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"a61163daf8a90b4a7ef154d5fc9c525f665734e3","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"74c6015375d8b9bc1b1eb79f20636c8e894bcad7","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"c7a27bb4d0f6573ca0f9c7ef0b63291486239190","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"6a4acd3e86fe5584050c213d95147eba33856033","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"7f66fdbc077faed3b52519228d21d81979e92249","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"2edc92f89eee328b5be5706b5d431bf90669e9c0","versionType":"git"},{"version":"6d4f5440a3a2bb2e9d0d582bbf98234e9e9bb095","status":"affected","lessThan":"e716edafedad4952fe3a4a273d2e039a84e8681a","versionType":"git"},{"version":"fee906f035f0bd18ff12d84d58766c44a2ab0918","status":"affected","versionType":"git"},{"version":"4.3.6","status":"affected","lessThan":"4.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-multitouch.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.4","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-multitouch.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/516da3f25cfe18643835af1cf09b0e9ffc36c383"},{"url":"https://git.kernel.org/stable/c/a61163daf8a90b4a7ef154d5fc9c525f665734e3"},{"url":"https://git.kernel.org/stable/c/74c6015375d8b9bc1b1eb79f20636c8e894bcad7"},{"url":"https://git.kernel.org/stable/c/c7a27bb4d0f6573ca0f9c7ef0b63291486239190"},{"url":"https://git.kernel.org/stable/c/6a4acd3e86fe5584050c213d95147eba33856033"},{"url":"https://git.kernel.org/stable/c/7f66fdbc077faed3b52519228d21d81979e92249"},{"url":"https://git.kernel.org/stable/c/2edc92f89eee328b5be5706b5d431bf90669e9c0"},{"url":"https://git.kernel.org/stable/c/e716edafedad4952fe3a4a273d2e039a84e8681a"}],"metrics":[{"cvssV3_1":{"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"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable path is reachable by a local process through /dev/uhid by creating a synthetic HID multitouch device and replying to the kernel's UHID_GET_REPORT with a mismatched report ID. Malicious physical HID devices can also trigger it, but UHID provides a higher-severity local device-file path.\nAC:L - The attacker controls the HID report descriptor and the feature-report response contents, and the bug is triggered deterministically during probe/open/resume feature fetching. There is no race or condition outside the attacker's control.\nPR:L - The local UHID path requires only access to the UHID character device as a low-privileged local user or permitted device group member. The kernel UHID create/reply path has no capable() gate requiring real root.\nUI:N - A local UHID attacker can create the virtual device and answer the kernel's GET_REPORT request directly. No separate victim action is required.\nS:U - The corruption occurs within the kernel HID/HID-core processing context and affects the same kernel security authority. It is not a VM escape, IOMMU bypass, or cross-authority boundary change.\nC:H - The fix commit states that the mismatched report response can lead to HID-core confusion with out-of-bounds writes. Kernel memory corruption is reasonably capable of producing arbitrary information disclosure primitives.\nI:H - An out-of-bounds write in kernel memory is high-integrity impact because it can corrupt kernel objects and plausibly be developed into control-flow hijack or privilege escalation. When uncertain, the higher severity is appropriate.\nA:H - The same kernel memory corruption can crash or panic the kernel during HID report processing. Even without full exploitation, repeated triggering can cause high availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:25:32.795Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"7.0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3.6"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-43047","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:13:55.670356Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","type":"CWE","description":"CWE-20 Improper Input Validation"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:06:11.151Z"}}]}}}