SB2026071333 - SUSE update for the Linux Kernel RT (Live Patch 15 for SUSE Linux Enterprise 15 SP7)
Published: July 13, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 9 vulnerabilities.
1) Out-of-bounds write (CVE-ID: CVE-2026-43501)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in ipv6_rpl_srh_rcv() and skb_mac_header_rebuild() when processing a crafted IPv6 packet with a recompressed type-3 source routing header. A local user can send a specially crafted raw IPv6 packet to trigger an out-of-bounds write and cause a denial of service.
Exploitation requires the ability to send an AF_INET6 SOCK_RAW packet with IPV6_HDRINCL over the loopback interface.
2) Use-after-free (CVE-ID: CVE-2026-45970)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the rlb_arp_recv function in the bonding ALB RX path when processing ARP messages during rapid bond up/down cycles. A local user can trigger concurrent bond up/down operations while ARP traffic is being received to cause a denial of service.
The issue is triggered by a race condition between rlb_arp_recv() and rlb_deinitialize().
3) Use-after-free (CVE-ID: CVE-2026-46120)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in ip6erspan_changelink() when changing link configuration after network namespace migration. A local user can trigger tunnel reinsertion into the wrong per-netns hash to cause a denial of service.
The issue is reachable from an unprivileged user namespace.
4) Use-after-free (CVE-ID: CVE-2026-46173)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to use-after-free in make_task_dead()/do_task_dead() task exit handling when an already-exiting task oopses during task exit. A local user can trigger an oops in a file_operations::release handler to cause memory corruption.
This can result in two tasks running on the same stack.
5) Use-after-free (CVE-ID: CVE-2026-46227)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to a use-after-free and type confusion in sctp_sendmsg() SCTP_SENDALL path when iterating associations after sctp_sendmsg_to_asoc() drops and reacquires the socket lock. A local user can trigger concurrent association migration or freeing to execute arbitrary code.
The issue is reachable with no effective capabilities, and the type-confusion path can lead to a controlled indirect call via the outqueue.sched->init_sid pointer.
6) Improper input validation (CVE-ID: CVE-2026-46243)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to improper input validation in the cifs.spnego key description handling in fs/smb/client/cifs_spnego.c when processing userspace-created cifs.spnego keys through request_key(2) or add_key(2). A local user can supply a crafted cifs.spnego description to disclose sensitive information, modify data, or cause a denial of service.
The issue arises because authority-bearing fields such as pid, uid, creduid, and upcall_target may be treated by cifs.upcall as kernel-originating inputs.
7) Improper access control (CVE-ID: CVE-2026-52909)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to move a fallback tunnel device to another network namespace.
The vulnerability exists due to improper access control in the ip6_vti fallback tunnel device initialization when initializing the per-network-namespace fallback device. A local user can move the ip6_vti0 device to another network namespace to move a fallback tunnel device to another network namespace.
The issue affects the per-netns fallback tunnel device ip6_vti0.
8) Use-after-free (CVE-ID: CVE-2026-52943)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to a use-after-free in pskb_carve_inside_header() and pskb_carve_inside_nonlinear() when copying skb_shared_info for MSG_ZEROCOPY skbs. A local user can trigger repeated zerocopy skb operations to escalate privileges.
The issue is caused by copying the destructor_arg pointer into a new skb_shared_info without incrementing the associated zerocopy reference count, which can prematurely free ubuf_info_msgzc while transmit skbs still hold live references.
9) Out-of-bounds write (CVE-ID: CVE-2026-53362)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to corrupt kernel memory.
The vulnerability exists due to an out-of-bounds write in __ip6_append_data() when processing UDPv6 socket data with MSG_MORE and MSG_SPLICE_PAGES on the paged allocation path. A local user can send crafted data through a UDPv6 socket to corrupt kernel memory.
The issue occurs when fraggap is non-zero and the paged-allocation branch is taken, causing writes past skb->end into trailing skb_shared_info.
Remediation
Install update from vendor's website.