SB2026090504 - openEuler 20.03 LTS SP4 update for kernel
Published: September 5, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 13 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2021-47358)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.5 [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]
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the gbphy_runtime_put_autosuspend(), gb_uart_probe() and gb_uart_remove() functions in drivers/staging/greybus/uart.c. A local user can escalate privileges on the system.
2) Use After Free (CVE-ID: CVE-2026-23340)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to execute arbitrary code or cause a denial of service.
The vulnerability exists due to a use-after-free in the network scheduler (qdisc) component when resetting transmit queues for lockless qdiscs during changes in the number of real transmit queues. A local user can trigger a race condition between qdisc_reset() and the packet dequeue path, leading to use-after-free and potential execution of arbitrary code or system crash.
Exploitation requires the ability to modify network interface queue configurations, which typically requires local user privileges. The issue affects systems using lockless qdiscs such as pfifo_fast, especially under high network load and frequent queue resizing operations.
3) Improper access control (CVE-ID: CVE-2026-31668)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 4.8 [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]
The vulnerability allows a local user to bypass routing policy restrictions.
The vulnerability exists due to improper access control in the seg6 lwtunnel dst_cache handling when processing input and output paths in different routing contexts. A local user can trigger packet processing through one path so that the other path reuses an incorrect cached destination to bypass routing policy restrictions.
The issue occurs because a single destination cache is shared between seg6_input_core() and seg6_output_core(), even though these paths may perform SID lookup under different routing contexts such as ingress-interface-based rules or VRF table separation.
4) Out-of-bounds read (CVE-ID: CVE-2026-52955)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds access in crush_decode() when processing a CEPH_MSG_OSD_MAP message containing a crush map with mismatched bucket algorithm fields. A remote attacker can send a specially crafted CEPH_MSG_OSD_MAP message to cause a denial of service.
5) Out-of-bounds read (CVE-ID: CVE-2026-52999)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause incorrect logging behavior.
The vulnerability exists due to an out-of-bounds read in nf_osf_match_one() in nfnetlink_osf when processing TCP option matching across multiple fingerprints. A remote attacker can send specially crafted network traffic to cause incorrect logging behavior.
The issue is triggered when NF_OSF_LOGLEVEL_ALL is configured and matching continues after an earlier fingerprint match.
6) Improper input validation (CVE-ID: CVE-2026-53131)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in netfilter Ethernet header handling when processing packets that reach ip6t_eui64, xt_mac, ipset bitmap:ip,mac, hash:ip,mac, hash:mac, or nf_log_syslog code paths without a valid Ethernet MAC header. A remote attacker can send a specially crafted packet to cause a denial of service.
The issue occurs because these paths access eth_hdr(skb) after insufficient validation that the skb is associated with an Ethernet device and that a full MAC header is present.
7) Improper input validation (CVE-ID: CVE-2026-53221)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause traffic to be associated with the wrong tunnel.
The vulnerability exists due to improper input validation in vti6_tnl_lookup() when matching IPv6 VTI tunnels during fallback wildcard tunnel searches. A remote attacker can send network traffic that triggers a hash collision and incorrect tunnel selection to cause traffic to be associated with the wrong tunnel.
The issue occurs because candidate tunnels in the fallback search were not verified to actually use wildcard local or remote addresses.
8) Out-of-bounds read (CVE-ID: CVE-2026-53225)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in __sctp_rcv_asconf_lookup() in net/sctp/input.c when processing a truncated trailing ASCONF chunk containing a declared IPv6 address parameter. A remote attacker can send a specially crafted SCTP packet to disclose sensitive information.
The issue is reachable from the no-association lookup path.
9) Use-after-free (CVE-ID: CVE-2026-53228)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to a use-after-free in the ipip6_tunnel_xmit() function in the SIT IPv6 tunneling implementation when handling GSO packets after offload processing. A local user can trigger transmission of a crafted packet to disclose sensitive information.
The issue occurs because a cached inner IPv6 header pointer may become stale if the skb head is moved during offload handling, and the stale pointer may later be used to read header fields.
10) Use-after-free (CVE-ID: CVE-2026-64564)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in sctp_process_asconf_param() when processing crafted SCTP ASCONF DEL-IP parameters. A remote attacker can send a specially crafted SCTP ASCONF message to cause a denial of service.
The issue can occur when a single ASCONF carries DEL-IP parameters that free the cached transport and a later wildcard DEL-IP reuses the dangling transport pointer.
11) Use-after-free (CVE-ID: CVE-2026-68156)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the Ceph authorizer handling code when processing a rebuilt authorizer during a messenger reconnect. A local user can trigger an authorizer update that reallocates the buffer and then cause a reconnect to use a stale pointer to cause a denial of service.
The issue is triggered when a newer service ticket causes the authorizer to be rebuilt and the rebuilt authorizer no longer fits in the existing buffer.
12) Improper input validation (CVE-ID: CVE-2026-68425)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper state validation in the kernel-handled RMPP receive processing in IB MAD handling when processing unsolicited active RMPP DATA responses. A remote attacker can send a specially crafted unmatched RMPP response to cause a denial of service.
The issue occurs because receive-side reassembly could begin before the full TID and source address were verified against an outstanding send.
13) Out-of-bounds read (CVE-ID: CVE-2026-74377)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause an out-of-bounds read.
The vulnerability exists due to an out-of-bounds read in rxe_resp_check_length() and copy_data() when processing a receive WQE from a shared queue buffer mapped into userspace. A local user can modify WQE fields such as num_sge or sge entries during processing to cause an out-of-bounds read.
The issue affects the non-SRQ queue pair receive path.
Remediation
Install update from vendor's website.