CVE-2026-68184

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If the device reports a\nblock descriptor, the function increases cgc->buflen to include that\ndescriptor and reads the page again.\n\nFor CDROMVOLCTRL, the function then builds a MODE SELECT parameter list\nby moving cgc->buffer forward by offset - 8 bytes. This drops the block\ndescriptor from the outgoing payload and leaves a new 8-byte mode\nparameter header in front of the audio control page. However, cgc->buflen\nis left unchanged.\n\nWith a standard 8-byte block descriptor, cgc->buffer points at buffer + 8\nbut cgc->buflen remains 32. cdrom_mode_select() therefore asks the low\nlevel packet path to write 32 bytes from that adjusted pointer, reading 8\nbytes past the end of the 32-byte stack buffer.\n\nThis is not hit by CDROMVOLREAD, and CDROMVOLCTRL only triggers it on\ndrives that return a non-zero block descriptor length, which helps explain\nwhy it has gone unnoticed. The overread is also sent to the device as\nextra MODE SELECT payload, so it may not produce an obvious local failure.\n\nReduce cgc->buflen by the same amount as the buffer pointer adjustment so\nthe MODE SELECT transfer covers only the intended parameter list."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/cdrom/cdrom.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "45c65df5339deea3cf204902aac383fe995941a7", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0329b661349f42f9616f2733da67edffbbb8455d", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e150c9a10baee55d3bfbc96dbe66b205e8b4fd44", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7344c84e32413e5c8832f74b8a612b0194e5c051", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "35b68e24c5a69fa4545f46f05f6c849223034cb6", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d43c5c0c935522deae7339e0c2399365f3bf0016", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f3e2715a150066f09aa82c30fa983fb184ad6dd5", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b27e195d4db8dea263050bdbeb11881b2999c9c6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/cdrom/cdrom.c"], "versions": [{"version": "2.6.12", 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/45c65df5339deea3cf204902aac383fe995941a7"}, {"url": "https://git.kernel.org/stable/c/0329b661349f42f9616f2733da67edffbbb8455d"}, {"url": "https://git.kernel.org/stable/c/e150c9a10baee55d3bfbc96dbe66b205e8b4fd44"}, {"url": "https://git.kernel.org/stable/c/7344c84e32413e5c8832f74b8a612b0194e5c051"}, {"url": "https://git.kernel.org/stable/c/35b68e24c5a69fa4545f46f05f6c849223034cb6"}, {"url": "https://git.kernel.org/stable/c/d43c5c0c935522deae7339e0c2399365f3bf0016"}, {"url": "https://git.kernel.org/stable/c/f3e2715a150066f09aa82c30fa983fb184ad6dd5"}, {"url": "https://git.kernel.org/stable/c/b27e195d4db8dea263050bdbeb11881b2999c9c6"}], "title": "cdrom: fix stack out-of-bounds read in CDROMVOLCTRL", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68184", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:43:51.994515Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:45:00.774Z"}}]}}

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If the device reports a\nblock descriptor, the function increases cgc->buflen to include that\ndescriptor and reads the page again.\n\nFor CDROMVOLCTRL, the function then builds a MODE SELECT parameter list\nby moving cgc->buffer forward by offset - 8 bytes. This drops the block\ndescriptor from the outgoing payload and leaves a new 8-byte mode\nparameter header in front of the audio control page. However, cgc->buflen\nis left unchanged.\n\nWith a standard 8-byte block descriptor, cgc->buffer points at buffer + 8\nbut cgc->buflen remains 32. cdrom_mode_select() therefore asks the low\nlevel packet path to write 32 bytes from that adjusted pointer, reading 8\nbytes past the end of the 32-byte stack buffer.\n\nThis is not hit by CDROMVOLREAD, and CDROMVOLCTRL only triggers it on\ndrives that return a non-zero block descriptor length, which helps explain\nwhy it has gone unnoticed. The overread is also sent to the device as\nextra MODE SELECT payload, so it may not produce an obvious local failure.\n\nReduce cgc->buflen by the same amount as the buffer pointer adjustment so\nthe MODE SELECT transfer covers only the intended parameter list."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "2.6.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:30:51.908Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68184", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:45:00.774Z", "dateReserved": "2026-07-30T09:28:09.373Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-10T11:59:56.319Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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If the device reports a\nblock descriptor, the function increases cgc->buflen to include that\ndescriptor and reads the page again.\n\nFor CDROMVOLCTRL, the function then builds a MODE SELECT parameter list\nby moving cgc->buffer forward by offset - 8 bytes. This drops the block\ndescriptor from the outgoing payload and leaves a new 8-byte mode\nparameter header in front of the audio control page. However, cgc->buflen\nis left unchanged.\n\nWith a standard 8-byte block descriptor, cgc->buffer points at buffer + 8\nbut cgc->buflen remains 32. cdrom_mode_select() therefore asks the low\nlevel packet path to write 32 bytes from that adjusted pointer, reading 8\nbytes past the end of the 32-byte stack buffer.\n\nThis is not hit by CDROMVOLREAD, and CDROMVOLCTRL only triggers it on\ndrives that return a non-zero block descriptor length, which helps explain\nwhy it has gone unnoticed. The overread is also sent to the device as\nextra MODE SELECT payload, so it may not produce an obvious local failure.\n\nReduce cgc->buflen by the same amount as the buffer pointer adjustment so\nthe MODE SELECT transfer covers only the intended parameter list."}], "id": "CVE-2026-68184", "lastModified": "2026-11-06T17:19:20.963", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68184", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:43:51.994515Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:05.497", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0329b661349f42f9616f2733da67edffbbb8455d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35b68e24c5a69fa4545f46f05f6c849223034cb6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/45c65df5339deea3cf204902aac383fe995941a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7344c84e32413e5c8832f74b8a612b0194e5c051"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b27e195d4db8dea263050bdbeb11881b2999c9c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d43c5c0c935522deae7339e0c2399365f3bf0016"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e150c9a10baee55d3bfbc96dbe66b205e8b4fd44"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3e2715a150066f09aa82c30fa983fb184ad6dd5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel cdrom: Stack out-of-bounds read in CDROMVOLCTRL", "id": "2513310", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513310"}, "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-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncdrom: fix stack out-of-bounds read in CDROMVOLCTRL\nmmc_ioctl_cdrom_volume() first reads the audio control mode page into a\n32-byte stack buffer with cgc->buflen set to 24. If the device reports a\nblock descriptor, the function increases cgc->buflen to include that\ndescriptor and reads the page again.\nFor CDROMVOLCTRL, the function then builds a MODE SELECT parameter list\nby moving cgc->buffer forward by offset - 8 bytes. This drops the block\ndescriptor from the outgoing payload and leaves a new 8-byte mode\nparameter header in front of the audio control page. However, cgc->buflen\nis left unchanged.\nWith a standard 8-byte block descriptor, cgc->buffer points at buffer + 8\nbut cgc->buflen remains 32. cdrom_mode_select() therefore asks the low\nlevel packet path to write 32 bytes from that adjusted pointer, reading 8\nbytes past the end of the 32-byte stack buffer.\nThis is not hit by CDROMVOLREAD, and CDROMVOLCTRL only triggers it on\ndrives that return a non-zero block descriptor length, which helps explain\nwhy it has gone unnoticed. The overread is also sent to the device as\nextra MODE SELECT payload, so it may not produce an obvious local failure.\nReduce cgc->buflen by the same amount as the buffer pointer adjustment so\nthe MODE SELECT transfer covers only the intended parameter list.", "A flaw was found in the Linux kernel's CD-ROM (cdrom) driver. When handling the `CDROMVOLCTRL` command, the `mmc_ioctl_cdrom_volume()` function can perform an incorrect calculation of buffer length after a pointer adjustment. This leads to a stack out-of-bounds read, where 8 bytes of data beyond the intended memory boundary are accessed. This unintended data is then included in the `MODE SELECT` payload sent to the CD-ROM device, which could potentially lead to information disclosure or unexpected device behavior."], "name": "CVE-2026-68184", "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": "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T11:59:56Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68184\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68184\nhttps://git.kernel.org/stable/c/35b68e24c5a69fa4545f46f05f6c849223034cb6\nhttps://git.kernel.org/stable/c/7344c84e32413e5c8832f74b8a612b0194e5c051\nhttps://git.kernel.org/stable/c/b27e195d4db8dea263050bdbeb11881b2999c9c6\nhttps://git.kernel.org/stable/c/d43c5c0c935522deae7339e0c2399365f3bf0016\nhttps://git.kernel.org/stable/c/f3e2715a150066f09aa82c30fa983fb184ad6dd5"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7344c84e32413e5c8832f74b8a612b0194e5c051)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,35b68e24c5a69fa4545f46f05f6c849223034cb6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d43c5c0c935522deae7339e0c2399365f3bf0016)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,f3e2715a150066f09aa82c30fa983fb184ad6dd5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b27e195d4db8dea263050bdbeb11881b2999c9c6)"}}], "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": "2.6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "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": "2026-08-10T18:00:03.528050+00:00", "updated": "2026-08-13T09:45:03.650745+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}