CVE-2025-37959— bpf: Scrub packet on bpf_redirect_peer
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，该漏洞源于未清理跨命名空间重定向的数据包，可能导致信息泄露。
Possible ATT&CK Techniques 1 AI
T1564.008 · Email Hiding RulesAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 9aa1206e8f48222f35a0c809f33b2f4aaa1e2661< de1067cc8cf0e8c11ae20cbe5c467aef19d04ded |
affected |
9aa1206e8f48222f35a0c809f33b2f4aaa1e2661< 355b0526336c0bf2bf7feaca033568ede524f763 |
affected | ||
9aa1206e8f48222f35a0c809f33b2f4aaa1e2661< b37e54259cab4f78b53953d6f6268b85f07bef3e |
affected | ||
9aa1206e8f48222f35a0c809f33b2f4aaa1e2661< 9e15ef33ba39fb6d9d1f51445957f16983a9437a |
affected | ||
9aa1206e8f48222f35a0c809f33b2f4aaa1e2661< c4327229948879814229b46aa26a750718888503 |
affected | ||
5.10 |
affected | ||
< 5.10 |
unaffected | ||
6.1.139≤ 6.1.* |
unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2025-37959
Vulnerability Information
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Vulnerability Title
bpf: Scrub packet on bpf_redirect_peer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Scrub packet on bpf_redirect_peer
When bpf_redirect_peer is used to redirect packets to a device in
another network namespace, the skb isn't scrubbed. That can lead skb
information from one namespace to be "misused" in another namespace.
As one example, this is causing Cilium to drop traffic when using
bpf_redirect_peer to redirect packets that just went through IPsec
decryption to a container namespace. The following pwru trace shows (1)
the packet path from the host's XFRM layer to the container's XFRM
layer where it's dropped and (2) the number of active skb extensions at
each function.
NETNS MARK IFACE TUPLE FUNC
4026533547 d00 eth0 10.244.3.124:35473->10.244.2.158:53 xfrm_rcv_cb
.active_extensions = (__u8)2,
4026533547 d00 eth0 10.244.3.124:35473->10.244.2.158:53 xfrm4_rcv_cb
.active_extensions = (__u8)2,
4026533547 d00 eth0 10.244.3.124:35473->10.244.2.158:53 gro_cells_receive
.active_extensions = (__u8)2,
[...]
4026533547 0 eth0 10.244.3.124:35473->10.244.2.158:53 skb_do_redirect
.active_extensions = (__u8)2,
4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 ip_rcv
.active_extensions = (__u8)2,
4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 ip_rcv_core
.active_extensions = (__u8)2,
[...]
4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 udp_queue_rcv_one_skb
.active_extensions = (__u8)2,
4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 __xfrm_policy_check
.active_extensions = (__u8)2,
4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 __xfrm_decode_session
.active_extensions = (__u8)2,
4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 security_xfrm_decode_session
.active_extensions = (__u8)2,
4026534999 0 eth0 10.244.3.124:35473->10.244.2.158:53 kfree_skb_reason(SKB_DROP_REASON_XFRM_POLICY)
.active_extensions = (__u8)2,
In this case, there are no XFRM policies in the container's network
namespace so the drop is unexpected. When we decrypt the IPsec packet,
the XFRM state used for decryption is set in the skb extensions. This
information is preserved across the netns switch. When we reach the
XFRM policy check in the container's netns, __xfrm_policy_check drops
the packet with LINUX_MIB_XFRMINNOPOLS because a (container-side) XFRM
policy can't be found that matches the (host-side) XFRM state used for
decryption.
This patch fixes this by scrubbing the packet when using
bpf_redirect_peer, as is done on typical netns switches via veth
devices except skb->mark and skb->tstamp are not zeroed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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，该漏洞源于未清理跨命名空间重定向的数据包，可能导致信息泄露。
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
II. Public POCs for CVE-2025-37959
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-05-20 · 95 CVEs total
| CVE-2025-37894 | 9.8 CRITICAL | net: use sock_gen_put() when sk_state is TCP_TIME_WAIT |
| CVE-2025-37924 | 9.8 CRITICAL | ksmbd: fix use-after-free in kerberos authentication |
| CVE-2025-37935 | 9.8 CRITICAL | net: ethernet: mtk_eth_soc: fix SER panic with 4GB+ RAM |
| CVE-2025-37918 | 8.8 HIGH | Bluetooth: btusb: avoid NULL pointer dereference in skb_dequeue() |
| CVE-2025-37899 | 8.8 HIGH | ksmbd: fix use-after-free in session logoff |
| CVE-2025-37943 | 8.8 HIGH | wifi: ath12k: Fix invalid data access in ath12k_dp_rx_h_undecap_nwifi |
| CVE-2025-37926 | 8.8 HIGH | ksmbd: fix use-after-free in ksmbd_session_rpc_open |
| CVE-2025-37944 | 8.8 HIGH | wifi: ath12k: Fix invalid entry fetch in ath12k_dp_mon_srng_process |
| CVE-2025-37947 | 8.8 HIGH | ksmbd: prevent out-of-bounds stream writes by validating *pos |
| CVE-2025-37952 | 8.8 HIGH | ksmbd: Fix UAF in __close_file_table_ids |
| CVE-2025-37956 | 8.8 HIGH | ksmbd: prevent rename with empty string |
| CVE-2025-37957 | 8.8 HIGH | KVM: SVM: Forcibly leave SMM mode on SHUTDOWN interception |
| CVE-2025-37936 | 8.7 HIGH | perf/x86/intel: KVM: Mask PEBS_ENABLE loaded for guest with vCPU's value. |
| CVE-2025-37973 | 8.1 HIGH | wifi: cfg80211: fix out-of-bounds access during multi-link element defragmentation |
| CVE-2025-37923 | 7.8 HIGH | tracing: Fix oob write in trace_seq_to_buffer() |
| CVE-2025-37979 | 7.8 HIGH | ASoC: qcom: Fix sc7280 lpass potential buffer overflow |
| CVE-2025-37920 | 7.8 HIGH | xsk: Fix race condition in AF_XDP generic RX path |
| CVE-2025-37921 | 7.8 HIGH | vxlan: vnifilter: Fix unlocked deletion of default FDB entry |
| CVE-2025-37964 | 7.8 HIGH | x86/mm: Eliminate window where TLB flushes may be inadvertently skipped |
| CVE-2025-37901 | 7.8 HIGH | irqchip/qcom-mpm: Prevent crash when trying to handle non-wake GPIOs |
Showing top 20 of 95 CVEs. View all on vendor page → →
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Same vendor: Linux
-
CVE-2026-99999
ipv4: validate checksum_start before completing checksum -
CVE-2026-98432
ipv4: free inet_opt and ireq_opt after an RCU grace period -
CVE-2026-98431
RDMA/uverbs: Fix mmap_lock/disassociation_lock circular depe -
CVE-2026-98430
RDMA/efa: Keep admin queues alive while IRQ is registered -
CVE-2026-98429
RDMA/efa: Keep EQ resources alive while IRQ is registered
V. Comments for CVE-2025-37959
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