# CVE-2026-23377: ice: change XDP RxQ frag_size from DMA write length to xdp.frame_sz

CVE-2026-23377 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-23377, released March 25, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-23377
- Priority: High
- CVSS: 7.1 (Important)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23377

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-23377](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23377.md) | Mar 25, 2026 |
| Linux | linux Debian 14 | 6.19.8-1 | [DEBIAN-CVE-2026-23377](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23377.md) | Mar 25, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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