SB2026062495 - openEuler 24.03 LTS SP3 update for kernel

Description

This security bulletin contains information about 6 vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2025-38443)

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 on the system.

The vulnerability exists due to a use-after-free error within the nbd_start_device() and set_bit() functions in drivers/block/nbd.c. A local user can escalate privileges on the system.

2) Use-after-free (CVE-ID: CVE-2026-31588)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/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 use-after-free in complete_emulated_mmio() when servicing an emulated MMIO write that splits a page boundary across MMIO pages. A local user can trigger crafted KVM_RUN operations to cause a denial of service.

The issue occurs for write payloads of 8 bytes or less and is most visible when the second KVM_RUN is performed by a separate task.

3) Improper Null Termination (CVE-ID: CVE-2026-43028)

CWE-ID: CWE-170 - Improper Null Termination

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 improper input validation in x_tables when processing names supplied to functions that expect c-strings. A local user can provide a name that lacks a nul terminator to cause a denial of service.

4) Out-of-bounds read (CVE-ID: CVE-2026-43197)

CWE-ID: CWE-125 - Out-of-bounds read

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 read in netconsole_write when processing console messages that are not nul-terminated. A local user can trigger processing of a specially crafted message to cause a denial of service.

5) Heap-based buffer overflow (CVE-ID: CVE-2026-46253)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/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 heap-based buffer overflow and an out-of-bounds read in persistent_ram_save_old() and ramoops_pstore_read() when processing persistent crash records after repeated calls for the same persistent_ram_zone. A local user can trigger a survivable crash sequence with a larger subsequent record to cause a denial of service.

Exploitation requires a prior crash record that did not fill the record size, pstore_update_ms to be enabled, and a non-fatal oops so the system continues running.

6) Out-of-bounds write (CVE-ID: CVE-2026-46331)

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 cause memory corruption.

The vulnerability exists due to an out-of-bounds write in tcf_pedit_act() when processing packet edit actions with typed keys and runtime header offsets. A local user can supply crafted pedit parameters that cause writes to a region that has not been properly copy-on-written to cause memory corruption.

The issue can involve negative offsets such as Ethernet header edits at ingress.

Remediation

Install update from vendor's website.

References

• https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-2752