CVE-2026-31602

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31602", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.121Z", "datePublished": "2026-04-24T14:42:25.935Z", "dateUpdated": "2026-08-05T12:23:44.562Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:23:44.562Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: ctxfi: Limit PTP to a single page\n\nCommit 391e69143d0a increased CT_PTP_NUM from 1 to 4 to support 256\nplayback streams, but the additional pages are not used by the card\ncorrectly. The CT20K2 hardware already has multiple VMEM_PTPAL\nregisters, but using them separately would require refactoring the\nentire virtual memory allocation logic.\n\nct_vm_map() always uses PTEs in vm->ptp[0].area regardless of\nCT_PTP_NUM. On AMD64 systems, a single PTP covers 512 PTEs (2M). When\naggregate memory allocations exceed this limit, ct_vm_map() tries to\naccess beyond the allocated space and causes a page fault:\n\n BUG: unable to handle page fault for address: ffffd4ae8a10a000\n Oops: Oops: 0002 [#1] SMP PTI\n RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi]\n Call Trace:\n atc_pcm_playback_prepare+0x225/0x3b0\n ct_pcm_playback_prepare+0x38/0x60\n snd_pcm_do_prepare+0x2f/0x50\n snd_pcm_action_single+0x36/0x90\n snd_pcm_action_nonatomic+0xbf/0xd0\n snd_pcm_ioctl+0x28/0x40\n __x64_sys_ioctl+0x97/0xe0\n do_syscall_64+0x81/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nRevert CT_PTP_NUM to 1. The 256 SRC_RESOURCE_NUM and playback_count\nremain unchanged."}], "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 reached through local ALSA PCM device operations on a ctxfi sound card, via open and ioctl on /dev/snd/pcmC*D*p. It is not reachable from network packets or user namespaces.\nAC:L - The trigger is deterministic: open/prepare enough playback substreams with normal PCM buffer sizing until the first PTP page is exceeded. There is no race or condition outside attacker control beyond access to the affected local device.\nPR:L - The attacker needs local userspace access to the ALSA PCM device node, which is commonly granted to an unprivileged logged-in audio user. No kernel capability or real root privilege is checked on the ioctl path.\nUI:N - No victim action is required after the attacker has local device access. The attacker directly issues the PCM setup and prepare ioctls.\nS:U - The impact is within the local kernel and device driver security authority. This is not a guest-to-host escape, IOMMU bypass, or other scope-changing boundary crossing.\nC:H - The bug is an out-of-bounds kernel write past the allocated page-table page, and such memory corruption can plausibly be leveraged for high-impact information disclosure. Under the higher-severity rule, this is scored as high confidentiality impact.\nI:H - ct_vm_map writes attacker-influenced DMA address values beyond vm->ptp[0].area when aggregate mappings exceed one page. This is kernel memory corruption, so integrity impact is high.\nA:H - The commit documents a reproducible kernel page fault and Oops in ct_vm_map from the PCM prepare path. A local attacker can repeatedly trigger this for high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/pci/ctxfi/ctvmem.h"], "versions": [{"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "c5908160e17cb56e1f61fbaee08adc21083f4933", "status": "affected", "versionType": "git"}, {"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "de8016fb0904d68ac886e375069535996baa42ee", "status": "affected", "versionType": "git"}, {"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "2b4331c08c0b385598b4d8ccd71e93ab3f4b2578", "status": "affected", "versionType": "git"}, {"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "452894005b4abe141b11fe01e7bfe152e6d3860f", "status": "affected", "versionType": "git"}, {"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "365c36e1a126c6aa1aecedd3a351bcabc66f0c29", "status": "affected", "versionType": "git"}, {"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "3fd0685d7fef68c2d8a04876bcf9eaa0724ad6a5", "status": "affected", "versionType": "git"}, {"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "b7f5ecd13cce8c2f8fa5a84c9aab65997142577e", "status": "affected", "versionType": "git"}, {"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "ad9011a795407093dcf507f6e5da1828987b4b47", "status": "affected", "versionType": "git"}, {"version": "391e69143d0a05f960e3ab39a8c26b7b230bb8a9", "lessThan": "e9418da50d9e5c496c22fe392e4ad74c038a94eb", "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/pci/ctxfi/ctvmem.h"], "versions": [{"version": "3.2", "status": "affected"}, {"version": "0", "lessThan": "3.2", 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The CT20K2 hardware already has multiple VMEM_PTPAL\nregisters, but using them separately would require refactoring the\nentire virtual memory allocation logic.\n\nct_vm_map() always uses PTEs in vm->ptp[0].area regardless of\nCT_PTP_NUM. On AMD64 systems, a single PTP covers 512 PTEs (2M). When\naggregate memory allocations exceed this limit, ct_vm_map() tries to\naccess beyond the allocated space and causes a page fault:\n\n BUG: unable to handle page fault for address: ffffd4ae8a10a000\n Oops: Oops: 0002 [#1] SMP PTI\n RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi]\n Call Trace:\n atc_pcm_playback_prepare+0x225/0x3b0\n ct_pcm_playback_prepare+0x38/0x60\n snd_pcm_do_prepare+0x2f/0x50\n snd_pcm_action_single+0x36/0x90\n snd_pcm_action_nonatomic+0xbf/0xd0\n snd_pcm_ioctl+0x28/0x40\n __x64_sys_ioctl+0x97/0xe0\n do_syscall_64+0x81/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nRevert CT_PTP_NUM to 1. The 256 SRC_RESOURCE_NUM and playback_count\nremain unchanged."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nALSA: ctxfi: Limitar PTP a una sola p\u00e1gina\n\nEl commit 391e69143d0a aument\u00f3 CT_PTP_NUM de 1 a 4 para soportar 256 flujos de reproducci\u00f3n, pero las p\u00e1ginas adicionales no son utilizadas correctamente por la tarjeta. El hardware CT20K2 ya tiene m\u00faltiples registros VMEM_PTPAL, pero usarlos por separado requerir\u00eda refactorizar toda la l\u00f3gica de asignaci\u00f3n de memoria virtual.\n\nct_vm_map() siempre usa PTEs en vm -> ptp[0].area independientemente de CT_PTP_NUM. En sistemas AMD64, un solo PTP cubre 512 PTEs (2M). Cuando las asignaciones de memoria agregadas exceden este l\u00edmite, ct_vm_map() intenta acceder m\u00e1s all\u00e1 del espacio asignado y causa un fallo de p\u00e1gina:\n\n BUG: no se puede manejar el fallo de p\u00e1gina para la direcci\u00f3n: ffffd4ae8a10a000\n Oops: Oops: 0002 [#1] SMP PTI\n RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi]\n Traza de Llamada:\n atc_pcm_playback_prepare+0x225/0x3b0\n ct_pcm_playback_prepare+0x38/0x60\n snd_pcm_do_prepare+0x2f/0x50\n snd_pcm_action_single+0x36/0x90\n snd_pcm_action_nonatomic+0xbf/0xd0\n snd_pcm_ioctl+0x28/0x40\n __x64_sys_ioctl+0x97/0xe0\n do_syscall_64+0x81/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nRevertir CT_PTP_NUM a 1. Los 256 SRC_RESOURCE_NUM y playback_count permanecen sin cambios."}], "id": "CVE-2026-31602", "lastModified": "2026-11-11T23:10:00.263", "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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-04-24T15:16:39.263", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2b4331c08c0b385598b4d8ccd71e93ab3f4b2578"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/365c36e1a126c6aa1aecedd3a351bcabc66f0c29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3fd0685d7fef68c2d8a04876bcf9eaa0724ad6a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/452894005b4abe141b11fe01e7bfe152e6d3860f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad9011a795407093dcf507f6e5da1828987b4b47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b7f5ecd13cce8c2f8fa5a84c9aab65997142577e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c5908160e17cb56e1f61fbaee08adc21083f4933"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/de8016fb0904d68ac886e375069535996baa42ee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e9418da50d9e5c496c22fe392e4ad74c038a94eb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ALSA: ctxfi: Limit PTP to a single page", "id": "2461507", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461507"}, "csaw": false, "cwe": "CWE-788", "details": ["A flaw was found in the Linux kernel's ALSA (Advanced Linux Sound Architecture) `ctxfi` driver. When handling memory allocations, the `ct_vm_map()` function can attempt to access memory beyond its allocated boundaries if aggregate memory allocations exceed a single page limit. This out-of-bounds access triggers a page fault, which can lead to a system crash. A local attacker could exploit this vulnerability to cause a Denial of Service (DoS) on the affected system."], "name": "CVE-2026-31602", "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": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31602\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31602\nhttps://lore.kernel.org/linux-cve-announce/2026042419-CVE-2026-31602-39fc@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[391e69143d0a05f960e3ab39a8c26b7b230bb8a9,452894005b4abe141b11fe01e7bfe152e6d3860f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[391e69143d0a05f960e3ab39a8c26b7b230bb8a9,365c36e1a126c6aa1aecedd3a351bcabc66f0c29)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[391e69143d0a05f960e3ab39a8c26b7b230bb8a9,3fd0685d7fef68c2d8a04876bcf9eaa0724ad6a5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[391e69143d0a05f960e3ab39a8c26b7b230bb8a9,b7f5ecd13cce8c2f8fa5a84c9aab65997142577e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[391e69143d0a05f960e3ab39a8c26b7b230bb8a9,ad9011a795407093dcf507f6e5da1828987b4b47)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[391e69143d0a05f960e3ab39a8c26b7b230bb8a9,e9418da50d9e5c496c22fe392e4ad74c038a94eb)"}}], "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": "generic", "value": "3.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.136,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.83,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.24,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.14,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.1,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc1,*]"}}], "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": "2026-04-27T19:00:15.635595+00:00", "updated": "2026-04-30T04:15:26.368992+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}