CVE-2026-80613: Linux Vulnerability (CVSS 7.8)

Description

In the Linux kernel, the following vulnerability has been resolved: veth: fix NAPI leak in XDP enable error path During XDP enablement in veth, if xdp_rxq_info_reg() or xdp_rxq_info_reg_mem_model() fails, the driver rolls back the changes. However, the rollback loop: for (i--; i >= start; i--) { decrements the loop index 'i' before the first iteration. This correctly skips unregistering the rxq for the failed index 'i' (as registration failed or was already cleaned up), but it also erroneously skips calling netif_napi_deli() for rq[i].xdp_napi. Since netif_napi_add() was already called for index 'i', this leaves a dangling napi_struct in the device's napi_list. When the veth device is later destroyed, the freed queue memory (which contains the leaked NAPI structure) can be reused. The subsequent device teardown iterates the NAPI list and corrupts the reallocated memory, leading to UAF. Fix this by explicitly deleting the NAPI association for the failed index 'i' before rolling back the successfully configured queues.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.17%

6.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= b02e5a0ebb172c8276cea3151942aac681f7a4a6, < fc51373345e7e6ea73da2650cb497309c50b077a; >= b02e5a0ebb172c8276cea3151942aac681f7a4a6, < 4559770b2a241344d762719e674241fcc8528f02; >= b02e5a0ebb172c8276cea3151942aac681f7a4a6, < 83090f5e7b54721d71875a6c224d2490b9e73050; >= b02e5a0ebb172c8276cea3151942aac681f7a4a6, < d3eb258ad398cc9402bab3a5e730cd7c5b34efad; >= b02e5a0ebb172c8276cea3151942aac681f7a4a6, < a9e6707322ef215d39d4655b176c094f45f0ab52; >= b02e5a0ebb172c8276cea3151942aac681f7a4a6, < 4bd2e5dbe62334aae1182d0f0d260f334a49d739; >= b02e5a0ebb172c8276cea3151942aac681f7a4a6, < 6739027cb72da26890edd424c77080d187b2a92e
Linux	Linux	5.11

References

Timeline

Published: Aug 28, 2026
Last Modified: Aug 29, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-80613?

In the Linux kernel, the following vulnerability has been resolved: veth: fix NAPI leak in XDP enable error path During XDP enablement in veth, if xdp_rxq_info_reg() or xdp_rxq_info_reg_mem_model() fails, the driver rolls back the changes. However, the rollback loop: for (i--; i >= start; i--) { decrements the loop index 'i' before the first iteration. This correctly skips unregistering the rxq for the failed index 'i' (as registration failed or was already cleaned up), but it also erroneously skips calling netif_napi_deli() for rq[i].xdp_napi. Since netif_napi_add() was already called for index 'i', this leaves a dangling napi_struct in the device's napi_list. When the veth device is later destroyed, the freed queue memory (which contains the leaked NAPI structure) can be reused. The subsequent device teardown iterates the NAPI list and corrupts the reallocated memory, leading to UAF. Fix this by explicitly deleting the NAPI association for the failed index 'i' before rolling back the successfully configured queues.

How severe is CVE-2026-80613?

CVE-2026-80613 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.

How do I fix CVE-2026-80613?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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