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CVE-2025-21670— vsock/bpf: return early if transport is not assigned

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_bpf_recvmsg函数在未分配传输层时未正确检查vsk->transport，导致在尝试接收数据时可能访问空指针，引发内核崩溃。

AI Predicted 4.4 Difficulty: Easy EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1207 · Rogue Domain Controller

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 634f1a7110b439c65fd8a809171c1d2d28bcea6f< 58e586c30d0b6f5dc0174a41026f2b0a48c9aab6 affected
634f1a7110b439c65fd8a809171c1d2d28bcea6f< 6771e1279dadf1d92a72e1465134257d9e6f2459 affected
634f1a7110b439c65fd8a809171c1d2d28bcea6f< f6abafcd32f9cfc4b1a2f820ecea70773e26d423 affected
6.4 affected
< 6.4 unaffected
6.6.74≤ 6.6.* unaffected
6.12.11≤ 6.12.* unaffected
6.13≤ * unaffected
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I. Basic Information for CVE-2025-21670

Vulnerability Information
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Vulnerability Title
vsock/bpf: return early if transport is not assigned
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock/bpf: return early if transport is not assigned Some of the core functions can only be called if the transport has been assigned. As Michal reported, a socket might have the transport at NULL, for example after a failed connect(), causing the following trace: BUG: kernel NULL pointer dereference, address: 00000000000000a0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 12faf8067 P4D 12faf8067 PUD 113670067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 15 UID: 0 PID: 1198 Comm: a.out Not tainted 6.13.0-rc2+ RIP: 0010:vsock_connectible_has_data+0x1f/0x40 Call Trace: vsock_bpf_recvmsg+0xca/0x5e0 sock_recvmsg+0xb9/0xc0 __sys_recvfrom+0xb3/0x130 __x64_sys_recvfrom+0x20/0x30 do_syscall_64+0x93/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e So we need to check the `vsk->transport` in vsock_bpf_recvmsg(), especially for connected sockets (stream/seqpacket) as we already do in __vsock_connectible_recvmsg().
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_bpf_recvmsg函数在未分配传输层时未正确检查vsk->transport，导致在尝试接收数据时可能访问空指针，引发内核崩溃。
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 634f1a7110b439c65fd8a809171c1d2d28bcea6f ~ 58e586c30d0b6f5dc0174a41026f2b0a48c9aab6 -
Linux Linux 6.4 -

II. Public POCs for CVE-2025-21670

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III. Intelligence Information for CVE-2025-21670

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Patches & Fixes for CVE-2025-21670 (3)

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-2025-21666 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-2025-21671 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-2025-21670

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