CVE-2021-47483

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double-free as follows:\n\nBUG: KASAN: double-free or invalid-free in kfree+0xce/0x390\nCall Trace:\n slab_free_freelist_hook+0x10d/0x240\n kfree+0xce/0x390\n regcache_rbtree_exit+0x15d/0x1a0\n regcache_rbtree_init+0x224/0x2c0\n regcache_init+0x88d/0x1310\n __regmap_init+0x3151/0x4a80\n __devm_regmap_init+0x7d/0x100\n madera_spi_probe+0x10f/0x333 [madera_spi]\n spi_probe+0x183/0x210\n really_probe+0x285/0xc30\n\nTo fix this, moving up the assignment of rbnode->block to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails."}], "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 bug is in regmap's local register cache (regcache_rbtree_insert_to_block), reached via driver probe/regmap init or local regmap writes through device interfaces (e.g. ASoC codecs), not by processing remote network payloads.\nAC:L - Triggering requires a GFP_KERNEL allocation failure on the second krealloc, but a local attacker can induce memory pressure to force that path; no victim state or attacker-uncontrollable race is required.\nPR:L - An unprivileged local user can drive regmap cache updates through widely deployed userspace-reachable device interfaces (notably ALSA/ASoC controls on systems with REGCACHE_RBTREE codecs) without needing root bind/module capabilities.\nUI:N - The attacker triggers the vulnerable path themselves via local operations and memory pressure; no separate victim action is required.\nS:U - Exploitation corrupts kernel heap memory within the same OS security authority (local privilege escalation), not a cross-boundary escape such as guest-to-host or IOMMU bypass.\nC:H - The dangling rbnode->block after the failed realloc is a use-after-free/double-free primitive, which can be heap-groomed to obtain arbitrary kernel memory disclosure.\nI:H - Double-free/UAF on the cache block enables heap corruption suitable for arbitrary write and control-flow hijacking in the kernel.\nA:H - The double-free in regcache_rbtree_exit() (and UAF on later cache access) reliably causes kernel oops/panic or otherwise crashes the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/base/regmap/regcache-rbtree.c"], "versions": [{"version": "3f4ff561bc88b074d5e868dde4012d89cbb06c87", "lessThan": "e72dce9afbdbfa70d9b44f5908a50ff6c4858999", "status": "affected", "versionType": "git"}, {"version": "3f4ff561bc88b074d5e868dde4012d89cbb06c87", "lessThan": "fc081477b47dfc3a6cb50a96087fc29674013fc2", "status": "affected", "versionType": "git"}, {"version": "3f4ff561bc88b074d5e868dde4012d89cbb06c87", "lessThan": "758ced2c3878ff789801e6fee808e185c5cf08d6", "status": "affected", "versionType": "git"}, {"version": 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arbitrary kernel memory disclosure.\nI:H - Double-free/UAF on the cache block enables heap corruption suitable for arbitrary write and control-flow hijacking in the kernel.\nA:H - The double-free in regcache_rbtree_exit() (and UAF on later cache access) reliably causes kernel oops/panic or otherwise crashes the system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3f4ff561bc88b074d5e868dde4012d89cbb06c87", "lessThan": "e72dce9afbdbfa70d9b44f5908a50ff6c4858999", "versionType": "git"}, {"status": "affected", "version": "3f4ff561bc88b074d5e868dde4012d89cbb06c87", "lessThan": "fc081477b47dfc3a6cb50a96087fc29674013fc2", "versionType": "git"}, {"status": "affected", "version": "3f4ff561bc88b074d5e868dde4012d89cbb06c87", "lessThan": "758ced2c3878ff789801e6fee808e185c5cf08d6", "versionType": "git"}, {"status": "affected", "version": 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"defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999"}, {"url": "https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2"}, {"url": "https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6"}, {"url": "https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091"}, {"url": "https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f"}, {"url": "https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6"}, {"url": "https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047"}, {"url": "https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nregmap: Fix possible double-free in regcache_rbtree_exit()\n\nIn regcache_rbtree_insert_to_block(), when 'present' realloc failed,\nthe 'blk' which is supposed to assign to 'rbnode->block' will be freed,\nso 'rbnode->block' points a freed memory, in the error handling path of\nregcache_rbtree_init(), 'rbnode->block' will be freed again in\nregcache_rbtree_exit(), KASAN will report double-free as follows:\n\nBUG: KASAN: double-free or invalid-free in kfree+0xce/0x390\nCall Trace:\n slab_free_freelist_hook+0x10d/0x240\n kfree+0xce/0x390\n regcache_rbtree_exit+0x15d/0x1a0\n regcache_rbtree_init+0x224/0x2c0\n regcache_init+0x88d/0x1310\n __regmap_init+0x3151/0x4a80\n __devm_regmap_init+0x7d/0x100\n madera_spi_probe+0x10f/0x333 [madera_spi]\n spi_probe+0x183/0x210\n really_probe+0x285/0xc30\n\nTo fix this, moving up the assignment of rbnode->block to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"9E9481B2-8AA6-4CBD-B5D3-C10F51FF6D01", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*", "matchCriteriaId": "EBD45831-4B79-42BC-ABC0-86870F0DEA89", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc7:*:*:*:*:*:*", "matchCriteriaId": "948A6B8D-1B72-4945-8680-354E53BE1C80", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nregmap: Fix possible double-free in regcache_rbtree_exit()\n\nIn regcache_rbtree_insert_to_block(), when 'present' realloc failed,\nthe 'blk' which is supposed to assign to 'rbnode->block' will be freed,\nso 'rbnode->block' points a freed memory, in the error handling path of\nregcache_rbtree_init(), 'rbnode->block' will be freed again in\nregcache_rbtree_exit(), KASAN will report double-free as follows:\n\nBUG: KASAN: double-free or invalid-free in kfree+0xce/0x390\nCall Trace:\n slab_free_freelist_hook+0x10d/0x240\n kfree+0xce/0x390\n regcache_rbtree_exit+0x15d/0x1a0\n regcache_rbtree_init+0x224/0x2c0\n regcache_init+0x88d/0x1310\n __regmap_init+0x3151/0x4a80\n __devm_regmap_init+0x7d/0x100\n madera_spi_probe+0x10f/0x333 [madera_spi]\n spi_probe+0x183/0x210\n really_probe+0x285/0xc30\n\nTo fix this, moving up the assignment of rbnode->block to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: regmap: corrige posible doble liberaci\u00f3n en regcache_rbtree_exit() En regcache_rbtree_insert_to_block(), cuando la realloc 'presente' fallaba, el 'blk' que se supone debe asignarse a 'rbnode->block ' se liberar\u00e1, por lo que 'rbnode->block' apunta a una memoria liberada, en la ruta de manejo de errores de regcache_rbtree_init(), 'rbnode->block' se liberar\u00e1 nuevamente en regcache_rbtree_exit(), KASAN informar\u00e1 la doble liberaci\u00f3n de la siguiente manera : ERROR: KASAN: doble libre o no v\u00e1lido en kfree+0xce/0x390 Rastreo de llamadas: slab_free_freelist_hook+0x10d/0x240 kfree+0xce/0x390 regcache_rbtree_exit+0x15d/0x1a0 regcache_rbtree_init+0x224/0x2c0 regcache_init+0x88d/ 0x1310 __regmap_init+0x3151/ 0x4a80 __devm_regmap_init+0x7d/0x100 madera_spi_probe+0x10f/0x333 [madera_spi] spi_probe+0x183/0x210 Actually_probe+0x285/0xc30 Para solucionar este problema, mueva hacia arriba la asignaci\u00f3n de rbnode->block inmediatamente despu\u00e9s de que la reasignaci\u00f3n se haya realizado correctamente para que la estructura de datos permanezca v\u00e1lido incluso si la segunda reasignaci\u00f3n falla."}], "id": "CVE-2021-47483", "lastModified": "2026-08-04T10:17:05.090", "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"}, {"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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47483", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:35:58.617398Z", "version": "2.0.3"}}]}, "published": "2024-05-22T09:15:10.227", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: regmap: Fix possible double-free in regcache_rbtree_exit()", "id": "2282939", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282939"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-415", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nregmap: Fix possible double-free in regcache_rbtree_exit()\nIn regcache_rbtree_insert_to_block(), when 'present' realloc failed,\nthe 'blk' which is supposed to assign to 'rbnode->block' will be freed,\nso 'rbnode->block' points a freed memory, in the error handling path of\nregcache_rbtree_init(), 'rbnode->block' will be freed again in\nregcache_rbtree_exit(), KASAN will report double-free as follows:\nBUG: KASAN: double-free or invalid-free in kfree+0xce/0x390\nCall Trace:\nslab_free_freelist_hook+0x10d/0x240\nkfree+0xce/0x390\nregcache_rbtree_exit+0x15d/0x1a0\nregcache_rbtree_init+0x224/0x2c0\nregcache_init+0x88d/0x1310\n__regmap_init+0x3151/0x4a80\n__devm_regmap_init+0x7d/0x100\nmadera_spi_probe+0x10f/0x333 [madera_spi]\nspi_probe+0x183/0x210\nreally_probe+0x285/0xc30\nTo fix this, moving up the assignment of rbnode->block to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails."], "name": "CVE-2021-47483", "package_state": [{"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": "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: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": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47483\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47483\nhttps://lore.kernel.org/linux-cve-announce/2024052238-CVE-2021-47483-8306@gregkh/T"], "threat_severity": "Low"}

{}