# CVE-2026-98967: cxgb4/ch_ktls: disable softirqs around tid_list erases

CVE-2026-98967 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-98967, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98967
- Priority: Routine
- CVSS: 4.1 (Moderate)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 23, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98967

## Description

In the Linux kernel, the following vulnerability has been resolved:  cxgb4/ch_ktls: disable softirqs around tid_list erases  chcr_ktls_cpl_act_open_rpl() inserts into tid_list from the receive path using xa_insert_bh().  The array is shared by the adapter's connections and initialized with XA_FLAGS_LOCK_BH.  However, chcr_ktls_dev_del() and the chcr_ktls_dev_add() error path use xa_erase(), which takes the XArray lock without disabling softirqs.  When cleanup runs with softirqs enabled, a receive softirq for another connection on the same CPU can interrupt the erase and spin on the lock held by the interrupted task.  Use xa_erase_bh() at both sites to match the insertion path.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-98967](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98967.md) | Oct 24, 2026 |
| Linux | linux Debian 14 | 7.2.11-1 | [DEBIAN-CVE-2026-98967](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98967.md) | Oct 24, 2026 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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