{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31720", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.134Z", "datePublished": "2026-05-01T14:14:22.832Z", "dateUpdated": "2026-05-02T06:14:21.352Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-02T06:14:21.352Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate control request size\n\nf_audio_complete() copies req->length bytes into a 4-byte stack\nvariable:\n\n u32 data = 0;\n memcpy(&data, req->buf, req->length);\n\nreq->length is derived from the host-controlled USB request path,\nwhich can lead to a stack out-of-bounds write.\n\nValidate req->actual against the expected payload size for the\nsupported control selectors and decode only the expected amount\nof data.\n\nThis avoids copying a host-influenced length into a fixed-size\nstack object."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/f_uac1_legacy.c"], "versions": [{"version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8", "lessThan": "557d1d4e862eccd0b74cc377b66de3e1e8d49605", "status": "affected", "versionType": "git"}, {"version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8", "lessThan": "21b11e8581285c6f10ef43d05df349d445f24273", "status": "affected", "versionType": "git"}, {"version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8", "lessThan": "0d41772d98dcaf6c17e875b7d0ea0154ae1191ee", "status": "affected", "versionType": "git"}, {"version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8", "lessThan": "c6da4fed7537aec19880c24f6c3a95065adb1406", "status": "affected", "versionType": "git"}, {"version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8", "lessThan": "be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8", "status": "affected", "versionType": "git"}, {"version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8", "lessThan": "8e5eb1d6e6a3d7bbea9c92132d0cda5793176426", "status": "affected", "versionType": "git"}, {"version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8", "lessThan": "26304d124e7f0383f8fe1168b5801a0ac7e16b1c", "status": "affected", "versionType": "git"}, {"version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8", "lessThan": "6e0e34d85cd46ceb37d16054e97a373a32770f6c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/f_uac1_legacy.c"], "versions": [{"version": "2.6.31", "status": "affected"}, {"version": "0", "lessThan": "2.6.31", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605"}, {"url": "https://git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273"}, {"url": "https://git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191ee"}, {"url": "https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406"}, {"url": "https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8"}, {"url": "https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426"}, {"url": "https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c"}, {"url": "https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c"}], "title": "usb: gadget: f_uac1_legacy: validate control request size", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate control request size\n\nf_audio_complete() copies req->length bytes into a 4-byte stack\nvariable:\n\n u32 data = 0;\n memcpy(&data, req->buf, req->length);\n\nreq->length is derived from the host-controlled USB request path,\nwhich can lead to a stack out-of-bounds write.\n\nValidate req->actual against the expected payload size for the\nsupported control selectors and decode only the expected amount\nof data.\n\nThis avoids copying a host-influenced length into a fixed-size\nstack object."}], "id": "CVE-2026-31720", "lastModified": "2026-05-01T15:24:14.893", "metrics": {}, "published": "2026-05-01T15:16:34.360", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191ee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: usb: gadget: f_uac1_legacy: validate control request size", "id": "2464437", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464437"}, "csaw": false, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's USB gadget audio class 1 (UAC1) legacy function. A remote attacker could exploit this vulnerability by sending a malicious USB control request, causing an out-of-bounds write on the stack. This could lead to a denial of service or potentially arbitrary code execution."], "name": "CVE-2026-31720", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31720\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31720\nhttps://lore.kernel.org/linux-cve-announce/2026050131-CVE-2026-31720-3b60@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,557d1d4e862eccd0b74cc377b66de3e1e8d49605)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,21b11e8581285c6f10ef43d05df349d445f24273)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,0d41772d98dcaf6c17e875b7d0ea0154ae1191ee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c6da4fed7537aec19880c24f6c3a95065adb1406)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,8e5eb1d6e6a3d7bbea9c92132d0cda5793176426)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,26304d124e7f0383f8fe1168b5801a0ac7e16b1c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6e0e34d85cd46ceb37d16054e97a373a32770f6c)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-01T15:30:20.173580+00:00", "updated": "2026-05-02T10:45:40.804230+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}