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CVE-2025-21666— vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]

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_*[has_data

AI Predicted 5.5 Difficulty: Moderate EPSS 0.22% · P13

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< daeac89cdb03d30028186f5ff7dc26ec8fa843e7 affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< 9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853e affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< b52e50dd4fabd12944172bd486a4f4853b7f74dd affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< bc9c49341f9728c31fe248c5fbba32d2e81a092b affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< c23d1d4f8efefb72258e9cedce29de10d057f8ca affected
c0cfa2d8a788fcf45df5bf4070ab2474c88d543a< 91751e248256efc111e52e15115840c35d85abaf affected
5.5 affected
< 5.5 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-21666

Vulnerability Information
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Vulnerability Title
vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock: prevent null-ptr-deref in vsock_*[has_data|has_space] Recent reports have shown how we sometimes call vsock_*_has_data() when a vsock socket has been de-assigned from a transport (see attached links), but we shouldn't. Previous commits should have solved the real problems, but we may have more in the future, so to avoid null-ptr-deref, we can return 0 (no space, no data available) but with a warning. This way the code should continue to run in a nearly consistent state and have a warning that allows us to debug future problems.
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 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_*[has_data|has_space]函数在套接字未分配传输层时被调用，可能导致空指针引用。虽然之前的修复解决了部分问题，但未来仍可能遇到类似情况，因此需要在函数中添加额外检查以避免崩溃。
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 ~ daeac89cdb03d30028186f5ff7dc26ec8fa843e7 -
Linux Linux 5.5 -

II. Public POCs for CVE-2025-21666

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III. Intelligence Information for CVE-2025-21666

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Patches & Fixes for CVE-2025-21666 (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-2025-21669 7.8 HIGH vsock/virtio: discard packets if the transport changes
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-2025-21667 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-2025-21666

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