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CVE-2025-21669— vsock/virtio: discard packets if the transport changes

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存在代码问题漏洞，该漏洞源于vsock协议在套接字被重新分配或未分配到传输层时，未正确丢弃接收到的包，可能导致访问未初始化或已释放的vsk->transport，引发空指针引用。

CVSS 7.8 · High EPSS 0.23% · P14

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< 18a7fc371d1dbf8deff16c2dd9292bcc73f43040 affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< 6486915fa661584d70e8e7e4068c6c075c67dd6d affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< 88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< d88b249e14bd0ee1e46bbe4f456e22e01b8c68de affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< 677579b641af109613564460a4e3bdcb16850b61 affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1 affected
5.5 affected
< 5.5 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-21669

Vulnerability Information
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Vulnerability Title
vsock/virtio: discard packets if the transport changes
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: discard packets if the transport changes If the socket has been de-assigned or assigned to another transport, we must discard any packets received because they are not expected and would cause issues when we access vsk->transport. A possible scenario is described by Hyunwoo Kim in the attached link, where after a first connect() interrupted by a signal, and a second connect() failed, we can find `vsk->transport` at NULL, leading to a NULL pointer dereference.
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 代码问题漏洞
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存在代码问题漏洞，该漏洞源于vsock协议在套接字被重新分配或未分配到传输层时，未正确丢弃接收到的包，可能导致访问未初始化或已释放的vsk->transport，引发空指针引用。
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 c0cfa2d8a788fcf45df5bf4070ab2474c88d543a ~ 18a7fc371d1dbf8deff16c2dd9292bcc73f43040 -
Linux Linux 5.5 -

II. Public POCs for CVE-2025-21669

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III. Intelligence Information for CVE-2025-21669

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Patches & Fixes for CVE-2025-21669 (6)

Same Patch Batch · Linux · 2025-01-31 · 20 CVEs total

CVE-2025-21673 9.8 CRITICAL smb: client: fix double free of TCP_Server_Info::hostname
CVE-2025-21680 7.8 HIGH pktgen: Avoid out-of-bounds access in get_imix_entries
CVE-2025-21678 7.8 HIGH gtp: Destroy device along with udp socket's netns dismantle.
CVE-2025-21677 7.8 HIGH pfcp: Destroy device along with udp socket's netns dismantle.
CVE-2025-21676 7.5 HIGH net: fec: handle page_pool_dev_alloc_pages error
CVE-2025-21682 7.3 HIGH eth: bnxt: always recalculate features after XDP clearing, fix null-deref
CVE-2024-57948 mac802154: check local interfaces before deleting sdata list
CVE-2025-21683 bpf: Fix bpf_sk_select_reuseport() memory leak
CVE-2025-21665 filemap: avoid truncating 64-bit offset to 32 bits
CVE-2025-21666 vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
CVE-2025-21667 iomap: avoid avoid truncating 64-bit offset to 32 bits
CVE-2025-21668 pmdomain: imx8mp-blk-ctrl: add missing loop break condition
CVE-2025-21670 vsock/bpf: return early if transport is not assigned
CVE-2025-21671 zram: fix potential UAF of zram table
CVE-2025-21672 afs: Fix merge preference rule failure condition
CVE-2025-21674 net/mlx5e: Fix inversion dependency warning while enabling IPsec tunnel
CVE-2025-21675 net/mlx5: Clear port select structure when fail to create
CVE-2025-21679 btrfs: add the missing error handling inside get_canonical_dev_path
CVE-2025-21681 openvswitch: fix lockup on tx to unregistering netdev with carrier

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21669

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