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CVE-2022-50496— dm cache: Fix UAF in destroy()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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dm cache在dm_resume和dm_destroy并发时存在释放后重用问题。

AI Predicted 4.4 Difficulty: Hard EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux c6b4fcbad044e6fffcc75bba160e720eb8d67d17< 034cbc8d3b47a56acd89453c29632a9c117de09d affected
c6b4fcbad044e6fffcc75bba160e720eb8d67d17< 993406104d2b28fe470126a062ad37a1e21e792e affected
c6b4fcbad044e6fffcc75bba160e720eb8d67d17< 4d20032dd90664de09f2902a7ea49ae2f7771746 affected
c6b4fcbad044e6fffcc75bba160e720eb8d67d17< 2f097dfac7579fd84ff98eb1d3acd41d53a485f3 affected
c6b4fcbad044e6fffcc75bba160e720eb8d67d17< 2b17026685a270b2beaf1cdd9857fcedd3505c7e affected
c6b4fcbad044e6fffcc75bba160e720eb8d67d17< d2a0b298ebf83ab6236f66788a3541e91ce75a70 affected
c6b4fcbad044e6fffcc75bba160e720eb8d67d17< 6ac4f36910764cb510bafc4c3768544f86ca48ca affected
c6b4fcbad044e6fffcc75bba160e720eb8d67d17< 6a3e412c2ab131c54945327a7676b006f000a209 affected
… +12 more rows
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I. Basic Information for CVE-2022-50496

Vulnerability Information
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Vulnerability Title
dm cache: Fix UAF in destroy()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm cache: Fix UAF in destroy() Dm_cache also has the same UAF problem when dm_resume() and dm_destroy() are concurrent. Therefore, cancelling timer again in destroy().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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dm cache在dm_resume和dm_destroy并发时存在释放后重用问题。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux c6b4fcbad044e6fffcc75bba160e720eb8d67d17 ~ 034cbc8d3b47a56acd89453c29632a9c117de09d -
Linux Linux 3.9 -

II. Public POCs for CVE-2022-50496

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III. Intelligence Information for CVE-2022-50496

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Patches & Fixes for CVE-2022-50496 (8)

Same Patch Batch · Linux · 2025-10-04 · 144 CVEs total

CVE-2025-39932 9.8 CRITICAL smb: client: let smbd_destroy() call disable_work_sync(&info->post_send_credits_work)
CVE-2025-39948 9.8 CRITICAL ice: fix Rx page leak on multi-buffer frames
CVE-2025-39946 9.8 CRITICAL tls: make sure to abort the stream if headers are bogus
CVE-2025-39933 9.4 CRITICAL smb: client: let recv_done verify data_offset, data_length and remaining_data_length
CVE-2025-39943 9.4 CRITICAL ksmbd: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer
CVE-2023-53600 9.1 CRITICAL tunnels: fix kasan splat when generating ipv4 pmtu error
CVE-2023-53615 8.8 HIGH scsi: qla2xxx: Fix deletion race condition
CVE-2025-39952 8.8 HIGH wifi: wilc1000: avoid buffer overflow in WID string configuration
CVE-2023-53589 8.8 HIGH wifi: iwlwifi: mvm: don't trust firmware n_channels
CVE-2023-53586 8.8 HIGH scsi: target: Fix multiple LUN_RESET handling
CVE-2022-50493 8.8 HIGH scsi: qla2xxx: Fix crash when I/O abort times out
CVE-2023-53598 8.4 HIGH bus: mhi: host: Range check CHDBOFF and ERDBOFF
CVE-2023-53566 7.8 HIGH netfilter: nft_set_rbtree: fix null deref on element insertion
CVE-2023-53536 7.8 HIGH blk-crypto: make blk_crypto_evict_key() more robust
CVE-2023-53560 7.8 HIGH tracing/histograms: Add histograms to hist_vars if they have referenced variables
CVE-2023-53559 7.8 HIGH ip_vti: fix potential slab-use-after-free in decode_session6
CVE-2023-53557 7.8 HIGH fprobe: Release rethook after the ftrace_ops is unregistered
CVE-2023-53537 7.8 HIGH f2fs: fix to avoid use-after-free for cached IPU bio
CVE-2023-53539 7.8 HIGH RDMA/rxe: Fix incomplete state save in rxe_requester
CVE-2023-53545 7.8 HIGH drm/amdgpu: unmap and remove csa_va properly

Showing top 20 of 144 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-50496

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