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CVE-2026-23254— net: gro: fix outer network offset

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GRO完成阶段未正确处理封装标志，可能导致校验和计算错误。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1040 · Network Sniffing

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux af276a5ac8e938c8b058e3e124073cc1e322d98b< 9d40a85138568696387ef04cd004c64612a70874 affected
5ef31ea5d053a8f493a772ebad3f3ce82c35d845< b83557bc6f560433fe5d727e241069f8db5ba709 affected
5ef31ea5d053a8f493a772ebad3f3ce82c35d845< 2e5edb69e5d0e23ef248c56fc977039268c77a7b affected
5ef31ea5d053a8f493a772ebad3f3ce82c35d845< 5c2c3c38be396257a6a2e55bd601a12bb9781507 affected
dbd9466d323a72e22efe09151253d195d36d3bf6 affected
6.6.31< 6.6.124 affected
6.8.10< 6.9 affected
6.9 affected
… +5 more rows
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I. Basic Information for CVE-2026-23254

Vulnerability Information
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Vulnerability Title
net: gro: fix outer network offset
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: gro: fix outer network offset The udp GRO complete stage assumes that all the packets inserted the RX have the `encapsulation` flag zeroed. Such assumption is not true, as a few H/W NICs can set such flag when H/W offloading the checksum for an UDP encapsulated traffic, the tun driver can inject GSO packets with UDP encapsulation and the problematic layout can also be created via a veth based setup. Due to the above, in the problematic scenarios, udp4_gro_complete() uses the wrong network offset (inner instead of outer) to compute the outer UDP header pseudo checksum, leading to csum validation errors later on in packet processing. Address the issue always clearing the encapsulation flag at GRO completion time. Such flag will be set again as needed for encapsulated packets by udp_gro_complete().
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 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GRO完成阶段未正确处理封装标志，可能导致校验和计算错误。
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 af276a5ac8e938c8b058e3e124073cc1e322d98b ~ 9d40a85138568696387ef04cd004c64612a70874 -
Linux Linux 6.9 -

II. Public POCs for CVE-2026-23254

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III. Intelligence Information for CVE-2026-23254

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Patches & Fixes for CVE-2026-23254 (4)

Same Patch Batch · Linux · 2026-03-18 · 35 CVEs total

CVE-2026-23246 8.8 HIGH wifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
CVE-2026-23270 7.8 HIGH net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks
CVE-2026-23268 7.8 HIGH apparmor: fix unprivileged local user can do privileged policy management
CVE-2026-23243 7.8 HIGH RDMA/umad: Reject negative data_len in ib_umad_write
CVE-2026-23245 7.8 HIGH net/sched: act_gate: snapshot parameters with RCU on replace
CVE-2026-23248 7.8 HIGH perf/core: Fix refcount bug and potential UAF in perf_mmap
CVE-2026-23253 7.8 HIGH media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
CVE-2026-23242 7.5 HIGH RDMA/siw: Fix potential NULL pointer dereference in header processing
CVE-2025-71268 7.5 HIGH btrfs: fix reservation leak in some error paths when inserting inline extent
CVE-2025-71269 7.5 HIGH btrfs: do not free data reservation in fallback from inline due to -ENOSPC
CVE-2026-23269 7.1 HIGH apparmor: validate DFA start states are in bounds in unpack_pdb
CVE-2026-23250 xfs: check return value of xchk_scrub_create_subord
CVE-2025-71265 fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata
CVE-2025-71266 fs: ntfs3: check return value of indx_find to avoid infinite loop
CVE-2025-71267 fs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST
CVE-2026-23267 f2fs: fix IS_CHECKPOINTED flag inconsistency issue caused by concurrent atomic commit and
CVE-2026-23266 fbdev: rivafb: fix divide error in nv3_arb()
CVE-2026-23265 f2fs: fix to do sanity check on node footer in {read,write}_end_io
CVE-2026-23244 nvme: fix memory allocation in nvme_pr_read_keys()
CVE-2026-23264 Revert "drm/amd: Check if ASPM is enabled from PCIe subsystem"

Showing top 20 of 35 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23254

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