What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-30

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.

Affected products

• Linux: from 5.10.42 before 5.10.273; from 5.12.9 before 5.13 — fixed in 5.10.273, 5.13

How to fix

Upgrade to a fixed version: Linux 5.10.273, 5.13. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0c5063a898813a420e6bad93debd134ef8b3bfd1
• https://git.kernel.org/stable/c/2c49ea1dd16d6dc0dd895e6aec57c9a448191cfe
• https://git.kernel.org/stable/c/4c9dc0faca98084922caeb689579d338cf3e1c29
• https://git.kernel.org/stable/c/7110c7f70c59eb7924e79853bcc00e2a026662e6
• https://git.kernel.org/stable/c/8739f06e3f82cd715f7dd10ab24029ed881efc90
• https://git.kernel.org/stable/c/bafe51bb145e6ae549ae79dcbc35648292625934
• https://git.kernel.org/stable/c/bcf97573d44e277b1744d7f1226f665aa0ccc599
• https://git.kernel.org/stable/c/bea736a2b8c6da5b1078badf1206541b5404250f

Get alerted when CVE-2026-98967 or the next vulnerability affects your stack