CVE-2026-31756

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This leads to:\n - spin_unlock on a lock that is not held (undefined behavior)\n - The lock remaining held after dwc2_gadget_exit_clock_gating() returns,\n causing a deadlock when spin_lock_irqsave() is called later in the\n same function.\n\nFix this by acquiring hsotg->lock before calling\ndwc2_gadget_exit_clock_gating() and releasing it afterwards, which\nsatisfies the locking requirement of the call_gadget() macro."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/dwc2/gadget.c"], "versions": [{"version": "5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd", "lessThan": "e9fcca3e87463013d595c65c2189ffaa32ad3b50", "status": "affected", "versionType": "git"}, {"version": "1ac826cebc2776f91569f2aa9c9c3da2375d2096", "lessThan": "8ffe31acb3b77a30ae34d01719a269881569fb7f", "status": "affected", "versionType": "git"}, {"version": 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{}

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["drivers/usb/dwc2/gadget.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.203", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.168", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.134", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.81", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.22", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "47F2AD8D-1BF2-49F3-AB68-24C4630BAFD0", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.15.187", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7E908ADC-45DA-494F-9E71-A310F56EDCAF", "versionEndExcluding": "6.1.168", "versionStartIncluding": "6.1.143", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E220ECC5-ECBC-4EFF-B943-1DEACE981592", "versionEndExcluding": "6.6.134", "versionStartIncluding": "6.6.96", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0FFEF924-DF26-4B6A-B663-70084F25414E", "versionEndExcluding": "6.12.81", "versionStartIncluding": "6.12.36", "vulnerable": true}, {"criteria": 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This leads to:\n - spin_unlock on a lock that is not held (undefined behavior)\n - The lock remaining held after dwc2_gadget_exit_clock_gating() returns,\n causing a deadlock when spin_lock_irqsave() is called later in the\n same function.\n\nFix this by acquiring hsotg->lock before calling\ndwc2_gadget_exit_clock_gating() and releasing it afterwards, which\nsatisfies the locking requirement of the call_gadget() macro."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nusb: dwc2: gadget: Correcci\u00f3n de desajuste de spin_lock/unlock en dwc2_hsotg_udc_stop()\n\ndwc2_gadget_exit_clock_gating() llama internamente a la macro call_gadget(), la cual espera que hsotg -> lock est\u00e9 retenido ya que realiza spin_unlock/spin_lock alrededor de la invocaci\u00f3n de la funci\u00f3n de devoluci\u00f3n de llamada del controlador del gadget.\n\nSin embargo, dwc2_hsotg_udc_stop() llama a dwc2_gadget_exit_clock_gating() sin retener el bloqueo. Esto conduce a:\n- spin_unlock en un bloqueo que no est\u00e1 retenido (comportamiento indefinido)\n- El bloqueo permanece retenido despu\u00e9s de que dwc2_gadget_exit_clock_gating() retorna, causando un interbloqueo cuando spin_lock_irqsave() es llamado m\u00e1s tarde en la misma funci\u00f3n.\n\nSolucione esto adquiriendo hsotg -> lock antes de llamar a dwc2_gadget_exit_clock_gating() y liber\u00e1ndolo despu\u00e9s, lo cual satisface el requisito de bloqueo de la macro call_gadget()."}], "id": "CVE-2026-31756", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-01T15:16:38.580", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/51b62286fc668c6eb74dee7624ec0beec3c5a0ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/61937f686290494998236c680ce0836b8dd63a3f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ffe31acb3b77a30ae34d01719a269881569fb7f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/beab10429439e20708036a66fb0d97ffb79da6a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e9fcca3e87463013d595c65c2189ffaa32ad3b50"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()", "id": "2464374", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464374"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-832", "details": ["A flaw was found in the Linux kernel's dwc2 USB gadget driver. A local user could trigger an incorrect locking sequence within the dwc2_hsotg_udc_stop() function. This issue, a spin_lock/unlock mismatch, can lead to a system deadlock, causing a Denial of Service (DoS) for the affected system."], "name": "CVE-2026-31756", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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-2026-31756\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31756\nhttps://lore.kernel.org/linux-cve-announce/2026050144-CVE-2026-31756-87ec@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd,e9fcca3e87463013d595c65c2189ffaa32ad3b50)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1ac826cebc2776f91569f2aa9c9c3da2375d2096,8ffe31acb3b77a30ae34d01719a269881569fb7f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[41732f9febdccb4f9b87c13cb915d717d68ccafd,beab10429439e20708036a66fb0d97ffb79da6a1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ba78c2b3254c4a458c01776612e8a573e12f8d26,4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af076a41f8a28faf9ceb9dd2d88aef2c202ef39a,61937f686290494998236c680ce0836b8dd63a3f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af076a41f8a28faf9ceb9dd2d88aef2c202ef39a,51b62286fc668c6eb74dee7624ec0beec3c5a0ed)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af076a41f8a28faf9ceb9dd2d88aef2c202ef39a,9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b39c203690fa1678daecc60f347e43c8b593b969,*]"}}], "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": "affected", "versions": {"scheme": "semver", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.134,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.81,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0,*]"}}], "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": "2026-05-01T16:45:20.675716+00:00", "updated": "2026-05-08T21:15:05.416695+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-667", "CWE-832"]}