CVE-2026-53270

ipvs: clear the svc scheduler ptr early on edit

State: Published
Severity: 7.8 High
Published: Jun 25, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before d10730a1f2caf08088e0db1b19b242f3e6fa5f06Affected 05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before e4feec3174036ba772006be74beee0efa09a9eb8Affected 05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 7d4f5004511757e3984901ffb412fcf858d80ed5Affected 05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before c6376b9b1b4d2bad638256b1b3588e073344ae69Affected 05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 14e4689c113b4c06af1069364ade24fdd7055f33Affected 05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 25918720ba97f974a4f8d433b5a0132c5b43f6f3Affected 05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03Affected 05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 193989cc6d80dd8e0460fb3992e69fa03bf0ff9bAffected c803fddd2a95a70873c68dbff42d4c59fd2e674eAffected 4ec8fb23158797affae7993c15beba080488482fAffected 3.18.23 to before 3.19Affected 4.1.11 to before 4.2Affected
LinuxLinux	4.2Affected before 4.2Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before d10730a1f2caf08088e0db1b19b242f3e6fa5f06Affected
05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before e4feec3174036ba772006be74beee0efa09a9eb8Affected
05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 7d4f5004511757e3984901ffb412fcf858d80ed5Affected
05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before c6376b9b1b4d2bad638256b1b3588e073344ae69Affected
05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 14e4689c113b4c06af1069364ade24fdd7055f33Affected
05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 25918720ba97f974a4f8d433b5a0132c5b43f6f3Affected
05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03Affected
05f00505a89acd21f5d0d20f5797dfbc4cf85243 to before 193989cc6d80dd8e0460fb3992e69fa03bf0ff9bAffected
c803fddd2a95a70873c68dbff42d4c59fd2e674eAffected
4ec8fb23158797affae7993c15beba080488482fAffected
3.18.23 to before 3.19Affected
4.1.11 to before 4.2Affected

LinuxLinux

4.2Affected
before 4.2Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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