Linux Kernel up to 6.19.6/7.0-rc2 bpf_xdp_frags_increase_tail denial of service

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.19.6/7.0-rc2. This vulnerability affects the function bpf_xdp_frags_increase_tail. Performing a manipulation results in denial of service. This vulnerability was named CVE-2026-23377. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.19.6/7.0-rc2. It has been classified as critical. This affects the function bpf_xdp_frags_increase_tail. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ice: change XDP RxQ frag_size from DMA write length to xdp.frame_sz The only user of frag_size field in XDP RxQ info is bpf_xdp_frags_increase_tail(). It clearly expects whole buff size instead of DMA write size. Different assumptions in ice driver configuration lead to negative tailroom. This allows to trigger kernel panic, when using XDP_ADJUST_TAIL_GROW_MULTI_BUFF xskxceiver test and changing packet size to 6912 and the requested offset to a huge value, e.g. XSK_UMEM__MAX_FRAME_SIZE * 100. Due to other quirks of the ZC configuration in ice, panic is not observed in ZC mode, but tailroom growing still fails when it should not. Use fill queue buffer truesize instead of DMA write size in XDP RxQ info. Fix ZC mode too by using the new helper.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-23377 since 01/13/2026. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 6.19.7 or 7.0-rc3 eliminates this vulnerability. Applying the patch b0f05100e8795aadd1c0606bae9caefbda070d63/e142dc4ef0f451b7ef99d09aaa84e9389af629d7 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.19.0
• 6.19.1
• 6.19.2
• 6.19.3
• 6.19.4
• 6.19.5
• 6.19.6
• 7.0-rc1
• 7.0-rc2

License

• open-source

Website

• Vendor: https://www.kernel.org/

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