CVE-2021-47483— regmap: Fix possible double-free in regcache_rbtree_exit()
Affected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 3f4ff561bc88b074d5e868dde4012d89cbb06c87< e72dce9afbdbfa70d9b44f5908a50ff6c4858999 | affected |
3f4ff561bc88b074d5e868dde4012d89cbb06c87< fc081477b47dfc3a6cb50a96087fc29674013fc2 | affected | ||
3f4ff561bc88b074d5e868dde4012d89cbb06c87< 758ced2c3878ff789801e6fee808e185c5cf08d6 | affected | ||
3f4ff561bc88b074d5e868dde4012d89cbb06c87< 3dae1a4eced3ee733d7222e69b8a55caf2d61091 | affected | ||
3f4ff561bc88b074d5e868dde4012d89cbb06c87< 1cead23c1c0bc766dacb900a3b0269f651ad596f | affected | ||
3f4ff561bc88b074d5e868dde4012d89cbb06c87< 36e911a16b377bde0ad91a8c679069d0d310b1a6 | affected | ||
3f4ff561bc88b074d5e868dde4012d89cbb06c87< 50cc1462a668dc62949a1127388bc3af785ce047 | affected | ||
3f4ff561bc88b074d5e868dde4012d89cbb06c87< 55e6d8037805b3400096d621091dfbf713f97e83 | affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2021-47483
Vulnerability Information
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Vulnerability Title
regmap: Fix possible double-free in regcache_rbtree_exit()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: regmap: Fix possible double-free in regcache_rbtree_exit() In regcache_rbtree_insert_to_block(), when 'present' realloc failed, the 'blk' which is supposed to assign to 'rbnode->block' will be freed, so 'rbnode->block' points a freed memory, in the error handling path of regcache_rbtree_init(), 'rbnode->block' will be freed again in regcache_rbtree_exit(), KASAN will report double-free as follows: BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390 Call Trace: 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 really_probe+0x285/0xc30 To fix this, moving up the assignment of rbnode->block to immediately after the reallocation has succeeded so that the data structure stays valid even if the second reallocation fails.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于regcache_rbtree_exit函数中存在双重释放问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-47483
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2024-05-22 · 63 CVEs total
| CVE-2021-47476 | comedi: ni_usb6501: fix NULL-deref in command paths | |
| CVE-2021-47493 | ocfs2: fix race between searching chunks and release journal_head from buffer_head | |
| CVE-2021-47495 | usbnet: sanity check for maxpacket | |
| CVE-2021-47496 | net/tls: Fix flipped sign in tls_err_abort() calls | |
| CVE-2021-47494 | cfg80211: fix management registrations locking | |
| CVE-2021-47482 | net: batman-adv: fix error handling | |
| CVE-2021-47480 | scsi: core: Put LLD module refcnt after SCSI device is released | |
| CVE-2021-47478 | isofs: Fix out of bound access for corrupted isofs image | |
| CVE-2021-47479 | staging: rtl8712: fix use-after-free in rtl8712_dl_fw | |
| CVE-2021-47477 | comedi: dt9812: fix DMA buffers on stack | |
| CVE-2021-47481 | RDMA/mlx5: Initialize the ODP xarray when creating an ODP MR | |
| CVE-2021-47475 | comedi: vmk80xx: fix transfer-buffer overflows | |
| CVE-2021-47474 | comedi: vmk80xx: fix bulk-buffer overflow | |
| CVE-2021-47473 | scsi: qla2xxx: Fix a memory leak in an error path of qla2x00_process_els() | |
| CVE-2021-47471 | drm: mxsfb: Fix NULL pointer dereference crash on unload | |
| CVE-2021-47470 | mm, slub: fix potential use-after-free in slab_debugfs_fops | |
| CVE-2021-47468 | isdn: mISDN: Fix sleeping function called from invalid context | |
| CVE-2021-47467 | kunit: fix reference count leak in kfree_at_end | |
| CVE-2021-47466 | mm, slub: fix potential memoryleak in kmem_cache_open() | |
| CVE-2021-47465 | KVM: PPC: Book3S HV: Fix stack handling in idle_kvm_start_guest() |
Showing top 20 of 63 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-46333
ptrace: slightly saner 'get_dumpable()' logic - CVE-2026-43490
ksmbd: validate inherited ACE SID length - CVE-2026-43489
liveupdate: luo_file: remember retrieve() status - CVE-2026-43487
ata: libata-core: Disable LPM on ST1000DM010-2EP102 - CVE-2026-43488
usb: xhci: Prevent interrupt storm on host controller error
Same vendor: Linux
- CVE-2026-46333
ptrace: slightly saner 'get_dumpable()' logic - CVE-2026-43490
ksmbd: validate inherited ACE SID length - CVE-2026-43489
liveupdate: luo_file: remember retrieve() status - CVE-2026-43487
ata: libata-core: Disable LPM on ST1000DM010-2EP102 - CVE-2026-43488
usb: xhci: Prevent interrupt storm on host controller error
V. Comments for CVE-2021-47483
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