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openSUSE: Linux Kernel RT Important Update CVE-2025-21702, 2025:02637-1

opensuse
Calendar Grey August 4, 2025
Dist Opensuse Esm H88
A significant enhancement for Linux Kernel RT in openSUSE addresses various security vulnerabilities. Update promptly to ensure your system's safety.
An update that solves three vulnerabilities can now be installed.

Description

This update for the Linux Kernel 6.4.0-150600_10_34 fixes several issues.

The following security issues were fixed:

* CVE-2025-37797: net_sched: hfsc: Fix a UAF vulnerability in class handling

(bsc#1245793).

* CVE-2025-37752: net_sched: sch_sfq: move the limit validation (bsc#1245776).

* CVE-2025-21702: pfifo_tail_enqueue: Drop new packet when sch->limit == 0

(bsc#1245797).

Topics%20covered

Topics Covered

security advisory buffer overflow DoS important OpenSUSE Linux Kernel RT

Patch

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like

YaST online_update or "zypper patch".

Alternatively you can run the command listed for your product:

* SUSE Linux Enterprise Live Patching 12-SP5

zypper in -t patch SUSE-SLE-Live-Patching-12-SP5-2025-2637=1 SUSE-SLE-Live-

Patching-12-SP5-2025-2622=1 SUSE-SLE-Live-Patching-12-SP5-2025-2663=1

* openSUSE Leap 15.3

zypper in -t patch SUSE-2025-2650=1

* SUSE Linux Enterprise Live Patching 15-SP3

zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP3-2025-2650=1

* openSUSE Leap 15.5

zypper in -t patch SUSE-2025-2654=1 SUSE-2025-2642=1

* SUSE Linux Enterprise Live Patching 15-SP5

zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP5-2025-2654=1 SUSE-SLE-

Module-Live-Patching-15-SP5-2025-2642=1

* SUSE Linux Enterprise Live Patching 15-SP6

zypper in -t patch SUSE-SLE-Module-Live-Patching-15-SP6-2025-2635=1

Package List

* SUSE Linux Enterprise Live Patching 12-SP5 (ppc64le s390x x86_64)

* kgraft-patch-4_12_14-122_244-default-7-2.1

* kgraft-patch-4_12_14-122_247-default-5-2.1

* kgraft-patch-4_12_14-122_255-default-4-2.1

* openSUSE Leap 15.3 (ppc64le s390x x86_64)

* kernel-livepatch-5_3_18-150300_59_198-default-5-150300.2.1

* kernel-livepatch-SLE15-SP3_Update_55-debugsource-5-150300.2.1

* kernel-livepatch-5_3_18-150300_59_198-default-debuginfo-5-150300.2.1

* openSUSE Leap 15.3 (x86_64)

* kernel-livepatch-5_3_18-150300_59_198-preempt-5-150300.2.1

* kernel-livepatch-5_3_18-150300_59_198-preempt-debuginfo-5-150300.2.1

* SUSE Linux Enterprise Live Patching 15-SP3 (ppc64le s390x x86_64)

* kernel-livepatch-5_3_18-150300_59_198-default-5-150300.2.1

* openSUSE Leap 15.5 (ppc64le s390x x86_64)

* kernel-livepatch-SLE15-SP5_Update_24-debugsource-4-150500.2.1

* kernel-livepatch-5_14_21-150500_55_94-default-debuginfo-4-150500.2.1

* kernel-livepatch-SLE15-SP5_Update_23-debugsource-4-150500.2.1

*...

Read the Full Advisory

References

* bsc#1245776

* bsc#1245793

* bsc#1245797

## References:

* https://www.suse.com/security/cve/CVE-2025-21702.html

* https://www.suse.com/security/cve/CVE-2025-37752.html

* https://www.suse.com/security/cve/CVE-2025-37797.html

* https://bugzilla.suse.com/show_bug.cgi?id=1245776

* https://bugzilla.suse.com/show_bug.cgi?id=1245793

* https://bugzilla.suse.com/show_bug.cgi?id=1245797

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2025:02637-1
Release Date: 2025-08-04T11:34:13Z
Affected Products: * openSUSE Leap 15.3 * openSUSE Leap 15.5 * SUSE Linux Enterprise High Performance Computing 12 SP5 * SUSE Linux Enterprise High Performance Computing 15 SP3 * SUSE Linux Enterprise High Performance Computing 15 SP5 * SUSE Linux Enterprise Live Patching 12-SP5 * SUSE Linux Enterprise Live Patching 15-SP3 * SUSE Linux Enterprise Live Patching 15-SP5 * SUSE Linux Enterprise Live Patching 15-SP6 * SUSE Linux Enterprise Micro 5.1 * SUSE Linux Enterprise Micro 5.2 * SUSE Linux Enterprise Micro 5.5 * SUSE Linux Enterprise Real Time 15 SP5 * SUSE Linux Enterprise Real Time 15 SP6 * SUSE Linux Enterprise Server 12 SP5 * SUSE Linux Enterprise Server 15 SP3 * SUSE Linux Enterprise Server 15 SP5 * SUSE Linux Enterprise Server 15 SP6 * SUSE Linux Enterprise Server for SAP Applications 12 SP5 * SUSE Linux Enterprise Server for SAP Applications 15 SP3 * SUSE Linux Enterprise Server for SAP Applications 15 SP5 * SUSE Linux Enterprise Server for SAP Applications 15 SP6

Topics%20covered

Topics Covered

security advisory buffer overflow DoS important OpenSUSE Linux Kernel RT

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