CVE-2026-74498

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However, maxsize is left at the original sample-rate\nderived value.\n\nSince u->buffer_size is allocated as maxsize * packets, the resulting\nDMA buffer is far too small for the requested transfer length. When the\nUSB host controller streams up to curpacksize bytes per packet, it writes\npast the end of the buffer via DMA, corrupting kernel heap memory.\n\nUpdate maxsize to curpacksize when fill_max is set so that the allocated\nDMA buffer size matches the actual transfer request size.\n\n[ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/usb/endpoint.c"], "versions": [{"version": "8fdff6a319e7dac757c558bd283dc4577e68cde7", "lessThan": "10c24e6fddf4bdff0b6b05a47a4347b38e6960e8", "status": "affected", "versionType": "git"}, {"version": "8fdff6a319e7dac757c558bd283dc4577e68cde7", "lessThan": "b1770f9ac35c0ffc34914d52347c65dcd5ac049b", "status": "affected", "versionType": "git"}, {"version": "8fdff6a319e7dac757c558bd283dc4577e68cde7", "lessThan": 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"https://git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5"}], "title": "ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74498", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:58:40.250517Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T17:05:47.457Z"}}]}}

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However, maxsize is left at the original sample-rate\nderived value.\n\nSince u->buffer_size is allocated as maxsize * packets, the resulting\nDMA buffer is far too small for the requested transfer length. When the\nUSB host controller streams up to curpacksize bytes per packet, it writes\npast the end of the buffer via DMA, corrupting kernel heap memory.\n\nUpdate maxsize to curpacksize when fill_max is set so that the allocated\nDMA buffer size matches the actual transfer request size.\n\n[ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]"}], "id": "CVE-2026-74498", "lastModified": "2026-11-06T17:19:49.767", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74498", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:58:40.250517Z", "version": "2.0.3"}}]}, "published": "2026-08-15T13:17:54.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/10c24e6fddf4bdff0b6b05a47a4347b38e6960e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3852974608f53e530e27c21d0c6c7d79c17b3f5a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b1770f9ac35c0ffc34914d52347c65dcd5ac049b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set", "id": "2517069", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517069"}, "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-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set\nWhen a USB audio endpoint requests full packet transfers via the fill_max\ndescriptor flag, data_ep_set_params() promotes ep->curpacksize to\nep->maxpacksize. However, maxsize is left at the original sample-rate\nderived value.\nSince u->buffer_size is allocated as maxsize * packets, the resulting\nDMA buffer is far too small for the requested transfer length. When the\nUSB host controller streams up to curpacksize bytes per packet, it writes\npast the end of the buffer via DMA, corrupting kernel heap memory.\nUpdate maxsize to curpacksize when fill_max is set so that the allocated\nDMA buffer size matches the actual transfer request size.\n[ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]", "A flaw was found in the Linux kernel's ALSA (Advanced Linux Sound Architecture) USB audio subsystem. When a USB audio endpoint requests full packet transfers using the `fill_max` descriptor flag, the system allocates an undersized Direct Memory Access (DMA) buffer. This allows a malicious USB device to write data beyond the buffer's boundaries, corrupting kernel heap memory. This memory corruption can lead to a system crash (Denial of Service) or potentially enable an attacker to execute arbitrary code with elevated privileges."], "name": "CVE-2026-74498", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74498\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74498\nhttps://lore.kernel.org/linux-cve-announce/2026081540-CVE-2026-74498-ea47@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8fdff6a319e7dac757c558bd283dc4577e68cde7,3852974608f53e530e27c21d0c6c7d79c17b3f5a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8fdff6a319e7dac757c558bd283dc4577e68cde7,f9b6c9576568169139ac151f7881474f384659fd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8fdff6a319e7dac757c558bd283dc4577e68cde7,04595233e5606d452f9f47e6989fc7ae7440fd40)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8fdff6a319e7dac757c558bd283dc4577e68cde7,bd65b7191683bebd9923904f0558b9211b9129da)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8fdff6a319e7dac757c558bd283dc4577e68cde7,d0199ae1666ff9b6e2d1d568d64c3430d4c47f0e5)"}}], "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": "3.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.151,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.103,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "7.2-rc6"}}], "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": "2026-08-15T16:00:07.793900+00:00", "updated": "2026-08-21T23:00:14.819216+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}