CVE-2026-98742

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98742", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.367Z", "datePublished": "2026-10-18T15:47:27.137Z", "dateUpdated": "2026-10-30T12:39:16.216Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:39:16.216Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Serialize compat port-info ioctls\n\nThe native sequencer ioctl path serializes handler calls with\nclient->ioctl_mutex, but the translated port-info compat path invokes the\nsame handlers through snd_seq_kernel_client_ctl() without taking that\nmutex.\n\nThis lets concurrent compat CREATE_PORT requests pass the port-count\ncheck before any request reaches the serialized insertion. The computed\ninteger port index can then exceed the address field range and wrap to an\nexisting index. Subsequent subscriber teardown can resolve the duplicate\naddress to the wrong port and access a freed subscriber.\n\nTake ioctl_mutex while dispatching converted port-info requests, matching\nthe native ioctl path. All translated port-info commands share this\nhelper, so their accesses to the client port state are serialized as\nwell."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/core/seq/seq_compat.c"], "versions": [{"version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "lessThan": "14e178c60ba1cea49186fcfccac93d66aa94e9e0", "status": "affected", "versionType": "git"}, {"version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "lessThan": "4980768c5d092493be0deb20d1ee86aa661466f8", "status": "affected", "versionType": "git"}, {"version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "lessThan": "2c0cce3a5a660270d65729b0f318d4e01470479d", "status": "affected", "versionType": "git"}, {"version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "lessThan": "2db234e163f0d211b69a4eebbec8aacc5a54a80e", "status": "affected", "versionType": "git"}, {"version": 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"versionType": "git"}, {"version": "623e5c8ae32b39cc8baea83478695dc624935318", "status": "affected", "versionType": "git"}, {"version": "e4ff9f294629b65df3f7982cd4faf86b2856b9d7", "status": "affected", "versionType": "git"}, {"version": "c3162384aed4cfe3f1a1f40041f3ba8cd7704d88", "status": "affected", "versionType": "git"}, {"version": "3.2.99", "lessThan": "3.3", "status": "affected", "versionType": "semver"}, {"version": "3.16.54", "lessThan": "3.17", "status": "affected", "versionType": "semver"}, {"version": "3.18.94", "lessThan": "3.19", "status": "affected", "versionType": "semver"}, {"version": "4.1.50", "lessThan": "4.2", "status": "affected", "versionType": "semver"}, {"version": "4.4.115", "lessThan": "4.5", "status": "affected", "versionType": "semver"}, {"version": "4.9.78", "lessThan": "4.10", "status": "affected", "versionType": "semver"}, {"version": "4.14.15", "lessThan": "4.15", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/core/seq/seq_compat.c"], "versions": [{"version": "4.15", "status": "affected"}, {"version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.10", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "4.15", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": 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{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["sound/core/seq/seq_compat.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "14e178c60ba1cea49186fcfccac93d66aa94e9e0", "status": "affected", "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "versionType": "git"}, {"lessThan": "4980768c5d092493be0deb20d1ee86aa661466f8", "status": "affected", "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "versionType": "git"}, {"lessThan": "2c0cce3a5a660270d65729b0f318d4e01470479d", "status": "affected", "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "versionType": "git"}, {"lessThan": "2db234e163f0d211b69a4eebbec8aacc5a54a80e", "status": "affected", "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "versionType": "git"}, {"lessThan": "413211dd31cb2ef2fc99fb0aa1a037a97509502c", "status": "affected", "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "versionType": "git"}, {"lessThan": "fc5c52848e405b6efb073db5035bb9ebaed11ec4", "status": "affected", "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "versionType": "git"}, {"lessThan": "702d92f361f65d9698c473c7599d471395dc4341", "status": "affected", "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "versionType": "git"}, {"lessThan": "95b2e0361c88753afa030c10698be0a1a5b67650", "status": "affected", "version": "b3defb791b26ea0683a93a4f49c77ec45ec96f10", "versionType": "git"}, {"status": "affected", "version": "d6693160906d55ba376bf0b88b7c129762170162", "versionType": "git"}, {"status": "affected", "version": "02cbce8576a31df8fca54aaec91ee081076bd79d", "versionType": "git"}, {"status": "affected", "version": "6aab3aa52366a0051e5abf8aae4616c42053fd8e", "versionType": "git"}, {"status": "affected", "version": "f8a38ab4cd9624fc5ac8a7f965c7b20f5b62c03c", "versionType": "git"}, {"status": "affected", "version": "623e5c8ae32b39cc8baea83478695dc624935318", "versionType": "git"}, {"status": "affected", "version": "e4ff9f294629b65df3f7982cd4faf86b2856b9d7", "versionType": "git"}, {"status": "affected", "version": "c3162384aed4cfe3f1a1f40041f3ba8cd7704d88", "versionType": "git"}, {"lessThan": "3.3", "status": "affected", "version": "3.2.99", "versionType": "semver"}, {"lessThan": "3.17", "status": "affected", "version": "3.16.54", "versionType": "semver"}, {"lessThan": "3.19", "status": "affected", "version": "3.18.94", "versionType": "semver"}, {"lessThan": "4.2", "status": "affected", "version": "4.1.50", "versionType": "semver"}, {"lessThan": "4.5", "status": "affected", "version": "4.4.115", "versionType": "semver"}, {"lessThan": "4.10", "status": "affected", "version": "4.9.78", "versionType": "semver"}, {"lessThan": "4.15", "status": "affected", "version": "4.14.15", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["sound/core/seq/seq_compat.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.15"}, {"lessThan": "4.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Serialize compat port-info ioctls\n\nThe native sequencer ioctl path serializes handler calls with\nclient->ioctl_mutex, but the translated port-info compat path invokes the\nsame handlers through snd_seq_kernel_client_ctl() without taking that\nmutex.\n\nThis lets concurrent compat CREATE_PORT requests pass the port-count\ncheck before any request reaches the serialized insertion. The computed\ninteger port index can then exceed the address field range and wrap to an\nexisting index. Subsequent subscriber teardown can resolve the duplicate\naddress to the wrong port and access a freed subscriber.\n\nTake ioctl_mutex while dispatching converted port-info requests, matching\nthe native ioctl path. All translated port-info commands share this\nhelper, so their accesses to the client port state are serialized as\nwell."}], "id": "CVE-2026-98742", "lastModified": "2026-10-30T13:21:22.930", "metrics": {}, "published": "2026-10-18T16:17:27.920", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/14e178c60ba1cea49186fcfccac93d66aa94e9e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c0cce3a5a660270d65729b0f318d4e01470479d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2db234e163f0d211b69a4eebbec8aacc5a54a80e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/413211dd31cb2ef2fc99fb0aa1a037a97509502c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4980768c5d092493be0deb20d1ee86aa661466f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/702d92f361f65d9698c473c7599d471395dc4341"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/95b2e0361c88753afa030c10698be0a1a5b67650"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fc5c52848e405b6efb073db5035bb9ebaed11ec4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Use-after-free via race condition in ALSA sequencer compatibility ioctls", "id": "2555109", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555109"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nALSA: seq: Serialize compat port-info ioctls\nThe native sequencer ioctl path serializes handler calls with\nclient->ioctl_mutex, but the translated port-info compat path invokes the\nsame handlers through snd_seq_kernel_client_ctl() without taking that\nmutex.\nThis lets concurrent compat CREATE_PORT requests pass the port-count\ncheck before any request reaches the serialized insertion. The computed\ninteger port index can then exceed the address field range and wrap to an\nexisting index. Subsequent subscriber teardown can resolve the duplicate\naddress to the wrong port and access a freed subscriber.\nTake ioctl_mutex while dispatching converted port-info requests, matching\nthe native ioctl path. All translated port-info commands share this\nhelper, so their accesses to the client port state are serialized as\nwell.", "A flaw was found in the Linux kernel's ALSA (Advanced Linux Sound Architecture) sequencer subsystem. A local user could exploit a race condition caused by missing locking during compatibility ioctl (input/output control) operations. By sending concurrent port creation requests, an attacker can corrupt internal port tracking and trigger a use-after-free condition when resources are released. This flaw may allow a local attacker to cause a system crash, leading to a denial of service (DoS), or potentially achieve privilege escalation."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-98742", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-10-18T15:47:27Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98742\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98742\nhttps://git.kernel.org/stable/c/413211dd31cb2ef2fc99fb0aa1a037a97509502c\nhttps://git.kernel.org/stable/c/702d92f361f65d9698c473c7599d471395dc4341\nhttps://git.kernel.org/stable/c/95b2e0361c88753afa030c10698be0a1a5b67650\nhttps://git.kernel.org/stable/c/fc5c52848e405b6efb073db5035bb9ebaed11ec4\nhttps://kernelcve.org/list/?q=CVE-2026-98742"], "statement": "A race condition in the ALSA sequencer compat ioctl path occurs because converted port-info requests call the common handlers without holding client ioctl_mutex. Concurrent compat CREATE_PORT operations can pass the port-count check before insertion, causing the integer port index to exceed the address field range and wrap to an existing port address. Later subscriber teardown can resolve the duplicate address to the wrong port and access a freed subscriber, creating a kernel use-after-free condition. For the CVSS the PR:L is selected because a local user with access to the ALSA sequencer device can invoke the compat ioctls without full administrative privileges. AC:H is selected because reliable triggering requires concurrent requests to hit a race window and a later teardown operation to reach the stale subscriber. The issue is not network reachable. Impact is at least a local denial of service through a kernel crash and in the worst case may include confidentiality and integrity impact or local privilege escalation due to reuse of the freed kernel object.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b3defb791b26ea0683a93a4f49c77ec45ec96f10,413211dd31cb2ef2fc99fb0aa1a037a97509502c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b3defb791b26ea0683a93a4f49c77ec45ec96f10,fc5c52848e405b6efb073db5035bb9ebaed11ec4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b3defb791b26ea0683a93a4f49c77ec45ec96f10,702d92f361f65d9698c473c7599d471395dc4341)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b3defb791b26ea0683a93a4f49c77ec45ec96f10,95b2e0361c88753afa030c10698be0a1a5b67650)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d6693160906d55ba376bf0b88b7c129762170162"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "02cbce8576a31df8fca54aaec91ee081076bd79d"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "6aab3aa52366a0051e5abf8aae4616c42053fd8e"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "f8a38ab4cd9624fc5ac8a7f965c7b20f5b62c03c"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "623e5c8ae32b39cc8baea83478695dc624935318"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "e4ff9f294629b65df3f7982cd4faf86b2856b9d7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "c3162384aed4cfe3f1a1f40041f3ba8cd7704d88"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.99,3.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.16.54,3.17)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.18.94,3.19)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.1.50,4.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.4.115,4.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.9.78,4.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.14.15,4.15)"}}], "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": "4.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.113,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.56,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.10,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "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": "2026-10-18T20:15:14.857991+00:00", "updated": "2026-10-22T21:15:12.490949+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416"]}