CVE-2026-80970

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80970", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.810Z", "datePublished": "2026-09-11T19:42:33.789Z", "dateUpdated": "2026-10-19T08:45:54.980Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:54.980Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: FCP: do not copy out an uninitialised init response\n\nfcp_ioctl_init() allocates its response buffer with kmalloc() and copies\nthe whole buffer back to userspace:\n\n\tbuf_size = init.step0_resp_size + init.step2_resp_size;\n\n\tvoid *resp __free(kfree) =\n\t\tkmalloc(buf_size, GFP_KERNEL);\n\t...\n\tif (copy_to_user(arg->resp, resp, buf_size))\n\t\treturn -EFAULT;\n\nNothing clears the buffer, and the only writer of its leading\nstep0_resp_size bytes is the step-0 control transfer:\n\n\terr = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),\n\t\tFCP_USB_REQ_STEP0,\n\t\tUSB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,\n\t\t0, private->bInterfaceNumber,\n\t\tstep0_resp, private->step0_resp_size);\n\tif (err < 0)\n\t\treturn err;\n\nusb_fill_control_urb() does not set URB_SHORT_NOT_OK, so a short or\nzero-length data stage completes with status 0 and snd_usb_ctl_msg()\nreturns a small actual_length. The only check is err < 0, so a short\ntransfer is accepted as success.\n\nsnd_usb_ctl_msg() copies the full size back unconditionally:\n\n\tbuf = kmemdup(data, size, GFP_KERNEL);\n\t...\n\tmemcpy(data, buf, size);\n\nBytes the device never wrote are therefore restored into resp unchanged\nand copied to userspace. step0_resp_size and step2_resp_size are each\nvalidated only to 1..255, so the caller also picks the slab cache, from\nkmalloc-8 up to kmalloc-512.\n\nOn 7.2.0-rc5 (arm64), device answering step 0 with a zero-length data\nstage, s0 = s2 = 255:\n\n # init_on_alloc off, no spray\n step0 window [0,255): nonzero=94/255\n 000: 00 80 60 06 00 00 ff ff 18 00 00 00 57 01 ea 01\n 010: 08 78 22 13 00 00 ff ff a8 c4 5f 80 00 80 ff ff\n\n # same kernel, kmalloc-512 pre-seeded with an 8-byte tag\n step0 window [0,255): nonzero=219/255 tagbytes=232\n\n # identical run, init_on_alloc=1\n step0 window [0,255): nonzero=0/255 tagbytes=0\n\n # all three runs\n step2 window [255,510): device words matched=62/62\n\na8 c4 5f 80 00 80 ff ff is the little-endian kernel text address\nffff8000805fc4a8. The step-2 window is unaffected, so the disclosure is\nexactly the step-0 region.\n\nZero the buffer, and require the step-0 transfer to deliver the full\nstep0_resp_size bytes so a short data stage is reported as an error.\n\nDiscovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/usb/fcp.c"], "versions": [{"version": "46757a3e7d50dac923888e7fbe68377736f13c70", "lessThan": "e9e52437120fb5f802152877ba20c4b406c9fa9e", "status": "affected", "versionType": "git"}, {"version": "46757a3e7d50dac923888e7fbe68377736f13c70", "lessThan": "29ab2df278ab4f1d238cd9c1c393ee00db175cba", "status": "affected", "versionType": "git"}, {"version": "46757a3e7d50dac923888e7fbe68377736f13c70", "lessThan": "4335e387786479889e6db691fe06d345e52ea536", "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/fcp.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "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": "6.14", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e9e52437120fb5f802152877ba20c4b406c9fa9e"}, {"url": "https://git.kernel.org/stable/c/29ab2df278ab4f1d238cd9c1c393ee00db175cba"}, {"url": "https://git.kernel.org/stable/c/4335e387786479889e6db691fe06d345e52ea536"}], "title": "ALSA: FCP: do not copy out an uninitialised init response", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["sound/usb/fcp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e9e52437120fb5f802152877ba20c4b406c9fa9e", "status": "affected", "version": "46757a3e7d50dac923888e7fbe68377736f13c70", "versionType": "git"}, {"lessThan": "29ab2df278ab4f1d238cd9c1c393ee00db175cba", "status": "affected", "version": "46757a3e7d50dac923888e7fbe68377736f13c70", "versionType": "git"}, {"lessThan": "4335e387786479889e6db691fe06d345e52ea536", "status": "affected", "version": "46757a3e7d50dac923888e7fbe68377736f13c70", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["sound/usb/fcp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "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: FCP: do not copy out an uninitialised init response\n\nfcp_ioctl_init() allocates its response buffer with kmalloc() and copies\nthe whole buffer back to userspace:\n\n\tbuf_size = init.step0_resp_size + init.step2_resp_size;\n\n\tvoid *resp __free(kfree) =\n\t\tkmalloc(buf_size, GFP_KERNEL);\n\t...\n\tif (copy_to_user(arg->resp, resp, buf_size))\n\t\treturn -EFAULT;\n\nNothing clears the buffer, and the only writer of its leading\nstep0_resp_size bytes is the step-0 control transfer:\n\n\terr = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),\n\t\tFCP_USB_REQ_STEP0,\n\t\tUSB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,\n\t\t0, private->bInterfaceNumber,\n\t\tstep0_resp, private->step0_resp_size);\n\tif (err < 0)\n\t\treturn err;\n\nusb_fill_control_urb() does not set URB_SHORT_NOT_OK, so a short or\nzero-length data stage completes with status 0 and snd_usb_ctl_msg()\nreturns a small actual_length. The only check is err < 0, so a short\ntransfer is accepted as success.\n\nsnd_usb_ctl_msg() copies the full size back unconditionally:\n\n\tbuf = kmemdup(data, size, GFP_KERNEL);\n\t...\n\tmemcpy(data, buf, size);\n\nBytes the device never wrote are therefore restored into resp unchanged\nand copied to userspace. step0_resp_size and step2_resp_size are each\nvalidated only to 1..255, so the caller also picks the slab cache, from\nkmalloc-8 up to kmalloc-512.\n\nOn 7.2.0-rc5 (arm64), device answering step 0 with a zero-length data\nstage, s0 = s2 = 255:\n\n # init_on_alloc off, no spray\n step0 window [0,255): nonzero=94/255\n 000: 00 80 60 06 00 00 ff ff 18 00 00 00 57 01 ea 01\n 010: 08 78 22 13 00 00 ff ff a8 c4 5f 80 00 80 ff ff\n\n # same kernel, kmalloc-512 pre-seeded with an 8-byte tag\n step0 window [0,255): nonzero=219/255 tagbytes=232\n\n # identical run, init_on_alloc=1\n step0 window [0,255): nonzero=0/255 tagbytes=0\n\n # all three runs\n step2 window [255,510): device words matched=62/62\n\na8 c4 5f 80 00 80 ff ff is the little-endian kernel text address\nffff8000805fc4a8. The step-2 window is unaffected, so the disclosure is\nexactly the step-0 region.\n\nZero the buffer, and require the step-0 transfer to deliver the full\nstep0_resp_size bytes so a short data stage is reported as an error.\n\nDiscovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>"}], "id": "CVE-2026-80970", "lastModified": "2026-10-19T09:17:28.847", "metrics": {}, "published": "2026-09-11T20:19:03.090", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/29ab2df278ab4f1d238cd9c1c393ee00db175cba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4335e387786479889e6db691fe06d345e52ea536"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e9e52437120fb5f802152877ba20c4b406c9fa9e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Information disclosure in ALSA FCP subsystem", "id": "2532310", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532310"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.5", "cvss3_scoring_vector": "CVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-908", "details": ["A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) FireWire Control Protocol (FCP) subsystem. This vulnerability allows a local attacker to trigger the copying of uninitialized kernel memory to userspace. By sending a specially crafted short or zero-length data stage during the FCP initialization, an attacker could potentially read sensitive information from the kernel's memory."], "name": "CVE-2026-80970", "public_date": "2026-09-11T19:42:33Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80970\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80970\nhttps://git.kernel.org/stable/c/29ab2df278ab4f1d238cd9c1c393ee00db175cba\nhttps://git.kernel.org/stable/c/4335e387786479889e6db691fe06d345e52ea536"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[46757a3e7d50dac923888e7fbe68377736f13c70,29ab2df278ab4f1d238cd9c1c393ee00db175cba)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[46757a3e7d50dac923888e7fbe68377736f13c70,4335e387786479889e6db691fe06d345e52ea536)"}}], "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": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-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": "2026-09-12T03:30:08.483124+00:00", "updated": "2026-09-21T03:15:09.531292+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}