SB2026070969 - openEuler 20.03 LTS SP4 update for kernel
Published: July 9, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2026-52923)
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 ipc_idr_alloc() in the checkpoint/restore SysV IPC allocation path when processing a request for the next SysV IPC id. A local user can request allocation beyond the valid IPC id range to cause a denial of service.
A subsequent walk of /proc/sysvipc/shm can dereference freed memory through a stale IDR entry.
2) Integer overflow (CVE-ID: CVE-2026-53133)
CWE-ID: CWE-190 - Integer overflow
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 integer overflow in __rdma_block_iter_next() in the RDMA umem block iterator when reassembling split scatter-gather entries during IOMMU-backed mapping linearization. A local user can trigger processing of a very large mapped block to cause a denial of service.
The issue occurs for block sizes greater than or equal to 4G when a single large block is split across multiple scatter-gather entries.
3) Out-of-bounds write (CVE-ID: CVE-2026-53176)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in isert_login_recv_done() and isert_rx_login_req() in drivers/infiniband/ulp/isert/ib_isert.c when processing a login PDU shorter than ISER_HEADERS_LEN. A remote attacker can send a specially crafted login send work request to cause a denial of service.
The vulnerable code path is reachable during the login phase before iSCSI authentication.
4) Out-of-bounds write (CVE-ID: CVE-2026-53194)
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 klsi_105_prepare_write_buffer() when processing writes to the tty device. A local user can write bulk_out_size or more bytes to the tty to cause a denial of service.
The issue is triggered when the write fifo holds at least the full bulk-out buffer size, causing data to be copied starting two bytes into a 64-byte buffer.
Remediation
Install update from vendor's website.