CVE-2026-23254

Enriched by CISA
 

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().
https://nvd.nist.gov/vuln/detail/CVE-2026-23254

Categories

No category defined

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • af276a5ac8e938c8b058e3e124073cc1e322d98b < 9d40a85138568696387ef04cd004c64612a70874 [affected]
  • 5ef31ea5d053a8f493a772ebad3f3ce82c35d845 < b83557bc6f560433fe5d727e241069f8db5ba709 [affected]
  • 5ef31ea5d053a8f493a772ebad3f3ce82c35d845 < 2e5edb69e5d0e23ef248c56fc977039268c77a7b [affected]
  • 5ef31ea5d053a8f493a772ebad3f3ce82c35d845 < 5c2c3c38be396257a6a2e55bd601a12bb9781507 [affected]
  • dbd9466d323a72e22efe09151253d195d36d3bf6 [affected]
Linux Linux
  • 6.9 [affected]
  • < 6.9 [unaffected]
  • 6.6.124 ≤ 6.6.* [unaffected]
  • 6.12.70 ≤ 6.12.* [unaffected]
  • 6.18.10 ≤ 6.18.* [unaffected]
  • 6.19 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.6.31 < 6.6.124
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.9 < 6.12.70
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.9 < 6.18.10
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.9 < 6.19
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.8.10

REMEDIATION


EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

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Other Nist (github, ...)

Url
No known exploits

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
No entry