CVE-2021-47055

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OTPLOCK\nis always write-once.\n\nMEMSETBADBLOCK modifies the bad block table."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires opening a local MTD char device (/dev/mtdX or /dev/mtdXro) and issuing ioctls; there is no network or adjacent-protocol path to mtdchar_ioctl.\nAC:L - A single successful open(O_RDONLY) plus ioctl reliably triggers the operations; no race, special memory layout, or other condition outside attacker control is required.\nPR:L - The bug is specifically reachable with only a read-only fd (including /dev/mtdXro). In the worst reasonable embedded/historical deployments those RO nodes are readable by unprivileged local users, so basic local user access suffices rather than real root with write open.\nUI:N - The attacker opens the device and issues the ioctl themselves; no separate victim action such as mounting or confirming a prompt is required.\nS:U - Impact is confined to flash protection/BBT state under the same host kernel authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - These ioctls change lock/OTP/BBT state and do not provide an out-of-bounds read, UAF reclaim, or other information-disclosure primitive.\nI:H - MEMLOCK/OTPLOCK can permanently (write-once) alter protection bits, MEMUNLOCK removes write protection, and MEMSETBADBLOCK corrupts the bad-block table\u2014constituting a serious, attacker-controlled integrity compromise of flash metadata and protection.\nA:H - Permanently locking firmware/OTP regions or marking blocks bad can render partitions or the whole device unusable/unbootable, which is a high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/mtd/mtdchar.c"], "versions": [{"version": "1c9f9125892a43901438bf704ada6b7019e2a884", "lessThan": "f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf", "status": "affected", "versionType": "git"}, {"version": "583d42400532fbd6228b0254d7c732b771e4750d", "lessThan": "9625b00cac6630479c0ff4b9fafa88bee636e1f0", "status": "affected", "versionType": "git"}, {"version": "389c74c218d3b182e9cd767e98cee0e0fd0dabaa", "lessThan": "f73b29819c6314c0ba8b7d5892dfb03487424bee", "status": "affected", "versionType": "git"}, {"version": "ab1a602a9cea98aa37b2e6851b168d2a2633a58d", "lessThan": "75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37", "status": "affected", "versionType": "git"}, {"version": "9a53e8bd59d9f070505e51d3fd19606a270e6b93", "lessThan": "5880afefe0cb9b2d5e801816acd58bfe91a96981", "status": "affected", "versionType": "git"}, {"version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3", "lessThan": "7b6552719c0ccbbea29dde4be141da54fdb5877e", "status": "affected", "versionType": "git"}, {"version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3", "lessThan": "077259f5e777c3c8821f6b41dee709fcda27306b", "status": "affected", "versionType": "git"}, {"version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3", "lessThan": "a08799d3e8c8088640956237c183f83463c39668", "status": "affected", "versionType": "git"}, {"version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3", "lessThan": "1e97743fd180981bef5f01402342bb54bf1c6366", "status": "affected", "versionType": "git"}, {"version": "36a8b2f49235e63ab3f901fe12e1b6732f075c2e", "status": "affected", "versionType": "git"}, {"version": "eb3d82abc335624a5e8ecfb75aba0b684e2dc4db", "status": "affected", "versionType": "git"}, {"version": "4.4.233", "lessThan": "4.4.269", "status": "affected", "versionType": "semver"}, {"version": "4.9.233", "lessThan": "4.9.269", "status": "affected", "versionType": "semver"}, {"version": "4.14.194", "lessThan": "4.14.233", "status": "affected", "versionType": "semver"}, {"version": "4.19.139", "lessThan": "4.19.191", "status": "affected", "versionType": "semver"}, {"version": "5.4.58", "lessThan": "5.4.119", "status": "affected", "versionType": "semver"}, {"version": "5.7.15", "lessThan": "5.8", "status": "affected", "versionType": "semver"}, {"version": "5.8.1", "lessThan": "5.9", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/mtd/mtdchar.c"], "versions": [{"version": "5.9", "status": "affected"}, {"version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver"}, {"version": "4.4.269", "lessThanOrEqual": "4.4.*", "status": "unaffected", 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"https://git.kernel.org/stable/c/5880afefe0cb9b2d5e801816acd58bfe91a96981"}, {"url": "https://git.kernel.org/stable/c/7b6552719c0ccbbea29dde4be141da54fdb5877e"}, {"url": "https://git.kernel.org/stable/c/077259f5e777c3c8821f6b41dee709fcda27306b"}, {"url": "https://git.kernel.org/stable/c/a08799d3e8c8088640956237c183f83463c39668"}, {"url": "https://git.kernel.org/stable/c/1e97743fd180981bef5f01402342bb54bf1c6366"}], "title": "mtd: require write permissions for locking and badblock ioctls", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47055", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-03-01T15:53:21.546664Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:13:55.596Z"}}, 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In the worst reasonable embedded/historical deployments those RO nodes are readable by unprivileged local users, so basic local user access suffices rather than real root with write open.\nUI:N - The attacker opens the device and issues the ioctl themselves; no separate victim action such as mounting or confirming a prompt is required.\nS:U - Impact is confined to flash protection/BBT state under the same host kernel authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - These ioctls change lock/OTP/BBT state and do not provide an out-of-bounds read, UAF reclaim, or other information-disclosure primitive.\nI:H - MEMLOCK/OTPLOCK can permanently (write-once) alter protection bits, MEMUNLOCK removes write protection, and MEMSETBADBLOCK corrupts the bad-block table\u2014constituting a serious, attacker-controlled integrity compromise of flash metadata and protection.\nA:H - Permanently locking firmware/OTP regions or marking blocks bad can render partitions or the whole device unusable/unbootable, which is a high availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1c9f9125892a43901438bf704ada6b7019e2a884", "lessThan": "f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf", "versionType": "git"}, {"status": "affected", "version": "583d42400532fbd6228b0254d7c732b771e4750d", "lessThan": "9625b00cac6630479c0ff4b9fafa88bee636e1f0", "versionType": "git"}, {"status": "affected", "version": "389c74c218d3b182e9cd767e98cee0e0fd0dabaa", "lessThan": "f73b29819c6314c0ba8b7d5892dfb03487424bee", "versionType": "git"}, {"status": "affected", "version": "ab1a602a9cea98aa37b2e6851b168d2a2633a58d", "lessThan": "75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37", "versionType": "git"}, {"status": "affected", "version": "9a53e8bd59d9f070505e51d3fd19606a270e6b93", "lessThan": "5880afefe0cb9b2d5e801816acd58bfe91a96981", 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Thus require\nwrite permission. Depending on the hardware MEMLOCK might even be\nwrite-once, e.g. for SPI-NOR flashes with their WP# tied to GND. 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{"affected_release": [{"advisory": "RHSA-2024:3627", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.5.1.rt7.346.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-06-05T00:00:00Z"}, {"advisory": "RHSA-2024:3618", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.5.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-06-05T00:00:00Z"}], "bugzilla": {"description": "kernel: mtd: require write permissions for locking and badblock ioctls", "id": "2267185", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267185"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmtd: require write permissions for locking and badblock ioctls\nMEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require\nwrite permission. Depending on the hardware MEMLOCK might even be\nwrite-once, e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK\nis always write-once.\nMEMSETBADBLOCK modifies the bad block table.", "A flaw was found in the Linux Kernel, requiring write permissions for locking and badblock ioctls, as they modify protection bits."], "name": "CVE-2021-47055", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"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": "2024-02-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47055\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47055\nhttps://lore.kernel.org/linux-cve-announce/2024022950-CVE-2021-47055-6927@gregkh/T/#u"], "statement": "Red Hat Enterprise Linux 9 is not affected by this vulnerability.", "threat_severity": "Moderate"}

{}