356 lines
18 KiB
JSON
356 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47483",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-22T06:20:56.200Z",
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"datePublished": "2024-05-22T08:19:34.852Z",
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"dateUpdated": "2026-08-05T08:48:00.568Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:48:00.568Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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