CVE-2026-23089

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Later when snd_card_register() runs,\nthe OSS mixer layer calls their callbacks and hits a use-after-free read.\n\nCall trace:\n get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\n get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\n mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\n snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\n ...\n snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\n usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\n\nFix by calling snd_ctl_remove() for all mixer controls before freeing\nid_elems. We save the next pointer first because snd_ctl_remove()\nfrees the current element."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/usb/mixer.c"], "versions": [{"version": "6639b6c2367f884ca172b78d69f7da17bfab2e5e", "lessThan": "51b1aa6fe7dc87356ba58df06afb9677c9b841ea", "status": "affected", "versionType": "git"}, {"version": "6639b6c2367f884ca172b78d69f7da17bfab2e5e", "lessThan": "56fb6efd5d04caf6f14994d51ec85393b9a896c6", "status": "affected", "versionType": "git"}, {"version": "6639b6c2367f884ca172b78d69f7da17bfab2e5e", "lessThan": "7009daeefa945973a530b2f605fe445fc03747af", "status": "affected", "versionType": "git"}, {"version": "6639b6c2367f884ca172b78d69f7da17bfab2e5e", "lessThan": "7bff0156d13f0ad9436e5178b979b063d59f572a", "status": "affected", "versionType": "git"}, {"version": "6639b6c2367f884ca172b78d69f7da17bfab2e5e", "lessThan": "e6f103a22b08daf5df2f4aa158081840e5910963", "status": "affected", "versionType": "git"}, {"version": "6639b6c2367f884ca172b78d69f7da17bfab2e5e", "lessThan": "dc1a5dd80af1ee1f29d8375b12dd7625f6294dad", "status": "affected", "versionType": "git"}, {"version": "6639b6c2367f884ca172b78d69f7da17bfab2e5e", "lessThan": "930e69757b74c3ae083b0c3c7419bfe7f0edc7b2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/usb/mixer.c"], "versions": [{"version": "2.6.13", "status": "affected"}, {"version": "0", "lessThan": "2.6.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.249", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.199", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.162", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.122", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.68", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.8", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19", "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": "2.6.13", "versionEndExcluding": "5.10.249"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.15.199"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.1.162"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.6.122"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.12.68"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.18.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/51b1aa6fe7dc87356ba58df06afb9677c9b841ea"}, {"url": "https://git.kernel.org/stable/c/56fb6efd5d04caf6f14994d51ec85393b9a896c6"}, {"url": "https://git.kernel.org/stable/c/7009daeefa945973a530b2f605fe445fc03747af"}, {"url": "https://git.kernel.org/stable/c/7bff0156d13f0ad9436e5178b979b063d59f572a"}, {"url": "https://git.kernel.org/stable/c/e6f103a22b08daf5df2f4aa158081840e5910963"}, {"url": "https://git.kernel.org/stable/c/dc1a5dd80af1ee1f29d8375b12dd7625f6294dad"}, {"url": "https://git.kernel.org/stable/c/930e69757b74c3ae083b0c3c7419bfe7f0edc7b2"}], "title": "ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23089", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-06-10T20:40:33.270292Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T18:25:30.214Z"}}]}}

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Later when snd_card_register() runs,\nthe OSS mixer layer calls their callbacks and hits a use-after-free read.\n\nCall trace:\n get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\n get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\n mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\n snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\n ...\n snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\n usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\n\nFix by calling snd_ctl_remove() for all mixer controls before freeing\nid_elems. We save the next pointer first because snd_ctl_remove()\nfrees the current element."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.249", "versionStartIncluding": "2.6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.199", "versionStartIncluding": "2.6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.162", "versionStartIncluding": "2.6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.122", "versionStartIncluding": "2.6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.68", "versionStartIncluding": "2.6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.8", "versionStartIncluding": "2.6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19", "versionStartIncluding": "2.6.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:59:47.264Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23089", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:25:30.214Z", "dateReserved": "2026-01-13T15:37:45.962Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-02-04T16:08:12.575Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Later when snd_card_register() runs,\nthe OSS mixer layer calls their callbacks and hits a use-after-free read.\n\nCall trace:\n get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\n get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\n mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\n snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\n ...\n snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\n usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\n\nFix by calling snd_ctl_remove() for all mixer controls before freeing\nid_elems. We save the next pointer first because snd_ctl_remove()\nfrees the current element."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nALSA: usb-audio: Correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en snd_usb_mixer_free()\n\nCuando snd_usb_create_mixer() falla, snd_usb_mixer_free() libera mixer->id_elems, pero los controles ya a\u00f1adidos a la tarjeta siguen referenciando la memoria liberada. M\u00e1s tarde, cuando se ejecuta snd_card_register(), la capa del mezclador OSS llama a sus retrollamadas y se produce una lectura de uso despu\u00e9s de liberaci\u00f3n.\n\nTraza de llamada:\n get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\n get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\n mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\n snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\n ...\n snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\n usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\n\nSe corrige llamando a snd_ctl_remove() para todos los controles del mezclador antes de liberar id_elems. Guardamos el siguiente puntero primero porque snd_ctl_remove() libera el elemento actual."}], "id": "CVE-2026-23089", "lastModified": "2026-10-19T19:17:35.503", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23089", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-10T20:40:33.270292Z", "version": "2.0.3"}}]}, "published": "2026-02-04T17:16:19.780", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/51b1aa6fe7dc87356ba58df06afb9677c9b841ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56fb6efd5d04caf6f14994d51ec85393b9a896c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7009daeefa945973a530b2f605fe445fc03747af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7bff0156d13f0ad9436e5178b979b063d59f572a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/930e69757b74c3ae083b0c3c7419bfe7f0edc7b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc1a5dd80af1ee1f29d8375b12dd7625f6294dad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e6f103a22b08daf5df2f4aa158081840e5910963"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()", "id": "2436773", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436773"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23089", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23089\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23089\nhttps://lore.kernel.org/linux-cve-announce/2026020424-CVE-2026-23089-760f@gregkh/T"], "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-18T18:28:14.048827+00:00", "value": {"mitigation_remediation": ["Apply the latest Linux kernel release that contains the ALSA USB audio patch.", "If an update is not yet available, disable the ALSA USB audio driver by removing or unloading the snd_usb module.", "Consider disabling or limiting USB audio device usage on systems that cannot be updated immediately."], "summary": {"action": "Patch Now", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Any Linux system running the kernel with the affected ALSA USB audio driver, including all releases of Linux kernel 6.19 (rc1 through rc6) and other kernel versions that include the same ALSA code.", "description_and_impact": "The vulnerability is a use\u2011after\u2011free in the Linux kernel ALSA USB audio subsystem. When mixer creation fails, the code frees memory that is still referenced by OSS mixer controls, causing an illegal read when the card is registered. This memory corruption can lead to a kernel crash, presenting a high\u2011severity local fault and a use\u2011after\u2011free weakness (CWE\u2011416).", "risk_and_exploitability": "The CVSS score of 7.8 marks this as high severity. The EPSS score of less than 1% indicates a currently low likelihood of exploitation, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. The attack vector is inferred to be local, requiring a user with access to the affected system to connect a USB audio device or otherwise trigger the Mixer creation failure."}}}}, "created": "2026-04-18T18:30:07.293255+00:00", "updated": "2026-04-18T18:30:07.293292+00:00", "vendors": []}