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CVE-2025-39951— um: virtio_uml: Fix use-after-free after put_device in probe

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，该漏洞源于设备注册失败后设置错误标志，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 04e5b1fb01834a602acaae2276b67a783a8c6159< 14c231959a16ca41bfdcaede72483362a8c645d7 affected
04e5b1fb01834a602acaae2276b67a783a8c6159< 5e94e44c9cb30d7a383d8ac227f24a8c9326b770 affected
04e5b1fb01834a602acaae2276b67a783a8c6159< aaf900a83508c8cd5cdf765e7749f9076196ec7f affected
04e5b1fb01834a602acaae2276b67a783a8c6159< 4f364023ddcfe83f7073b973a9cb98584b7f2a46 affected
04e5b1fb01834a602acaae2276b67a783a8c6159< 00e98b5a69034b251bb36dc6e7123d7648e218e4 affected
04e5b1fb01834a602acaae2276b67a783a8c6159< c2ff91255e0157b356cff115d8dc3eeb5162edf2 affected
04e5b1fb01834a602acaae2276b67a783a8c6159< 7ebf70cf181651fe3f2e44e95e7e5073d594c9c0 affected
5.5 affected
… +8 more rows
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I. Basic Information for CVE-2025-39951

Vulnerability Information
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Vulnerability Title
um: virtio_uml: Fix use-after-free after put_device in probe
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: um: virtio_uml: Fix use-after-free after put_device in probe When register_virtio_device() fails in virtio_uml_probe(), the code sets vu_dev->registered = 1 even though the device was not successfully registered. This can lead to use-after-free or other issues.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于设备注册失败后设置错误标志，可能导致释放后重用。
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 04e5b1fb01834a602acaae2276b67a783a8c6159 ~ 14c231959a16ca41bfdcaede72483362a8c645d7 -
Linux Linux 5.5 -

II. Public POCs for CVE-2025-39951

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III. Intelligence Information for CVE-2025-39951

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Patches & Fixes for CVE-2025-39951 (7)

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-2025-39951

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