Security update for the Linux Kernel (Live Patch 22 for SLE 15 SP4) SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2025:0250-1 Final 1 1 2025-01-27T12:04:12Z current 2025-01-27T12:04:12Z 2025-01-27T12:04:12Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for the Linux Kernel (Live Patch 22 for SLE 15 SP4) This update for the Linux Kernel 5.14.21-150400_24_103 fixes one issue. The following security issue was fixed: - CVE-2024-36971: Fixed __dst_negative_advice() race (bsc#1226324). The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2025-247,SUSE-2025-250,SUSE-SLE-Module-Live-Patching-15-SP3-2025-250,SUSE-SLE-Module-Live-Patching-15-SP4-2025-247 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2025/suse-su-20250250-1/ Link for SUSE-SU-2025:0250-1 https://lists.suse.com/pipermail/sle-security-updates/2025-January/020219.html E-Mail link for SUSE-SU-2025:0250-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1226324 SUSE Bug 1226324 https://www.suse.com/security/cve/CVE-2024-36971/ SUSE CVE CVE-2024-36971 page SUSE Linux Enterprise Live Patching 15 SP3 SUSE Linux Enterprise Live Patching 15 SP4 kernel-livepatch-5_14_21-150400_24_103-default-14-150400.2.1 kernel-livepatch-5_3_18-150300_59_147-default-16-150300.2.1 kernel-livepatch-5_3_18-150300_59_147-preempt-16-150300.2.1 kernel-livepatch-5_3_18-150300_59_147-default-16-150300.2.1 as a component of SUSE Linux Enterprise Live Patching 15 SP3 kernel-livepatch-5_14_21-150400_24_103-default-14-150400.2.1 as a component of SUSE Linux Enterprise Live Patching 15 SP4 In the Linux kernel, the following vulnerability has been resolved: net: fix __dst_negative_advice() race __dst_negative_advice() does not enforce proper RCU rules when sk->dst_cache must be cleared, leading to possible UAF. RCU rules are that we must first clear sk->sk_dst_cache, then call dst_release(old_dst). Note that sk_dst_reset(sk) is implementing this protocol correctly, while __dst_negative_advice() uses the wrong order. Given that ip6_negative_advice() has special logic against RTF_CACHE, this means each of the three ->negative_advice() existing methods must perform the sk_dst_reset() themselves. Note the check against NULL dst is centralized in __dst_negative_advice(), there is no need to duplicate it in various callbacks. Many thanks to Clement Lecigne for tracking this issue. This old bug became visible after the blamed commit, using UDP sockets. CVE-2024-36971 SUSE Linux Enterprise Live Patching 15 SP3:kernel-livepatch-5_3_18-150300_59_147-default-16-150300.2.1 SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_103-default-14-150400.2.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-20250250-1/ https://www.suse.com/security/cve/CVE-2024-36971.html CVE-2024-36971 https://bugzilla.suse.com/1226145 SUSE Bug 1226145 https://bugzilla.suse.com/1226324 SUSE Bug 1226324