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CVE-2025-40350— net/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ

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mlx5e未正确处理非线性xdp_buff，可能导致错误skb生成。

CVSS 9.8 · Critical EPSS 0.55% · P45

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux f52ac7028bec22e925c8fece4f21641eb13b4d6f< 8b051d7f530e8a5237da242fbeafef02fec6b813 affected
f52ac7028bec22e925c8fece4f21641eb13b4d6f< cb9edd583e23979ee546981be963ad5f217e8b18 affected
f52ac7028bec22e925c8fece4f21641eb13b4d6f< f2557d7fa38e9475b38588f5c124476091480f53 affected
f52ac7028bec22e925c8fece4f21641eb13b4d6f< 87bcef158ac1faca1bd7e0104588e8e2956d10be affected
6.4 affected
< 6.4 unaffected
6.6.115≤ 6.6.* unaffected
6.12.56≤ 6.12.* unaffected
… +2 more rows
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I. Basic Information for CVE-2025-40350

Vulnerability Information
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Vulnerability Title
net/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ XDP programs can change the layout of an xdp_buff through bpf_xdp_adjust_tail() and bpf_xdp_adjust_head(). Therefore, the driver cannot assume the size of the linear data area nor fragments. Fix the bug in mlx5 by generating skb according to xdp_buff after XDP programs run. Currently, when handling multi-buf XDP, the mlx5 driver assumes the layout of an xdp_buff to be unchanged. That is, the linear data area continues to be empty and fragments remain the same. This may cause the driver to generate erroneous skb or triggering a kernel warning. When an XDP program added linear data through bpf_xdp_adjust_head(), the linear data will be ignored as mlx5e_build_linear_skb() builds an skb without linear data and then pull data from fragments to fill the linear data area. When an XDP program has shrunk the non-linear data through bpf_xdp_adjust_tail(), the delta passed to __pskb_pull_tail() may exceed the actual nonlinear data size and trigger the BUG_ON in it. To fix the issue, first record the original number of fragments. If the number of fragments changes after the XDP program runs, rewind the end fragment pointer by the difference and recalculate the truesize. Then, build the skb with the linear data area matching the xdp_buff. Finally, only pull data in if there is non-linear data and fill the linear part up to 256 bytes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 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mlx5e未正确处理非线性xdp_buff，可能导致错误skb生成。
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 f52ac7028bec22e925c8fece4f21641eb13b4d6f ~ 8b051d7f530e8a5237da242fbeafef02fec6b813 -
Linux Linux 6.4 -

II. Public POCs for CVE-2025-40350

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III. Intelligence Information for CVE-2025-40350

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Other References for CVE-2025-40350 (4)

Same Patch Batch · Linux · 2025-12-16 · 156 CVEs total

CVE-2025-68192 9.8 CRITICAL net: usb: qmi_wwan: initialize MAC header offset in qmimux_rx_fixup
CVE-2025-68301 9.8 CRITICAL net: atlantic: fix fragment overflow handling in RX path
CVE-2025-68284 9.8 CRITICAL libceph: prevent potential out-of-bounds writes in handle_auth_session_key()
CVE-2025-68285 9.8 CRITICAL libceph: fix potential use-after-free in have_mon_and_osd_map()
CVE-2025-68263 9.8 CRITICAL ksmbd: ipc: fix use-after-free in ipc_msg_send_request
CVE-2025-68315 9.8 CRITICAL f2fs: fix to detect potential corrupted nid in free_nid_list
CVE-2025-68304 8.8 HIGH Bluetooth: hci_core: lookup hci_conn on RX path on protocol side
CVE-2025-68256 8.8 HIGH staging: rtl8723bs: fix out-of-bounds read in rtw_get_ie() parser
CVE-2025-68255 8.8 HIGH staging: rtl8723bs: fix stack buffer overflow in OnAssocReq IE parsing
CVE-2025-68226 8.8 HIGH smb: client: fix incomplete backport in cfids_invalidation_worker()
CVE-2025-68314 8.8 HIGH drm/msm: make sure last_fence is always updated
CVE-2025-40362 8.8 HIGH ceph: fix multifs mds auth caps issue
CVE-2025-68250 8.2 HIGH hung_task: fix warnings caused by unaligned lock pointers
CVE-2025-68179 7.8 HIGH s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
CVE-2025-68260 7.8 HIGH rust_binder: fix race condition on death_list
CVE-2025-68181 7.8 HIGH drm/radeon: Remove calls to drm_put_dev()
CVE-2025-68294 7.8 HIGH io_uring/net: ensure vectored buffer node import is tied to notification
CVE-2025-68183 7.8 HIGH ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr
CVE-2025-68234 7.8 HIGH io_uring/cmd_net: fix wrong argument types for skb_queue_splice()
CVE-2025-68212 7.8 HIGH fs: Fix uninitialized 'offp' in statmount_string()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40350

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