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Vulnerability record · CVE-2026-53270 · published 25 June 2026

CVE-2026-53270: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ipvs: clear the svc scheduler ptr early on edit ip_vs_edit_service() while unbinding the old scheduler clears the svc->scheduler ptr after the scheduler module initiates RCU callbacks. This can cause packets to use the old scheduler at the time when svc->sched_data is already freed after RCU grace period. Fix it by clearing the ptr early in ip_vs_unbind_scheduler(), before the done_service method schedules any RCU callbacks. Also, if the new scheduler fails to initialize when replacing the old scheduler, try to restore the old scheduler while still returning the error code.

7.8 CVSS 3.1 High EPSS 0.12% · top 98.3%
7.8CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: clear the svc scheduler ptr early on edit ip_vs_edit_service() while unbinding the old scheduler clears the svc->scheduler ptr after the scheduler module initiates RCU callbacks. This can cause packets to use the old scheduler at the time when svc->sched_data is already freed after RCU grace period. Fix it by clearing the ptr early in ip_vs_unbind_scheduler(), before the done_service method schedules any RCU callbacks. Also, if the new scheduler fails to initialize when replacing the old scheduler, try to restore the old scheduler while still returning the error code.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/14e4689c113b4c06af1069364ade24fdd7055f33 Patch
https://git.kernel.org/stable/c/193989cc6d80dd8e0460fb3992e69fa03bf0ff9b Patch
https://git.kernel.org/stable/c/19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03 Patch
https://git.kernel.org/stable/c/25918720ba97f974a4f8d433b5a0132c5b43f6f3 Patch
https://git.kernel.org/stable/c/7d4f5004511757e3984901ffb412fcf858d80ed5 Patch
https://git.kernel.org/stable/c/c6376b9b1b4d2bad638256b1b3588e073344ae69 Patch
https://git.kernel.org/stable/c/d10730a1f2caf08088e0db1b19b242f3e6fa5f06 Patch
https://git.kernel.org/stable/c/e4feec3174036ba772006be74beee0efa09a9eb8 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53270), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.