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

EPSS 0.03% · P9
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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: NVD (National Vulnerability Database)
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: 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 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

VendorProductAffected VersionsCPESubscribe
LinuxLinux c0cfa2d8a788fcf45df5bf4070ab2474c88d543a ~ 18a7fc371d1dbf8deff16c2dd9292bcc73f43040 -
LinuxLinux 5.5 -

II. Public POCs for CVE-2025-21669

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III. Intelligence Information for CVE-2025-21669

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

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21669

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