An update for kernel is now available for openEuler-22.03-LTS Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2023-1144 Final 1.0 1.0 2023-03-04 Initial 2023-03-04 2023-03-04 openEuler SA Tool V1.0 2023-03-04 kernel security update An update for kernel is now available for openEuler-22.03-LTS. The Linux Kernel, the operating system core itself. Security Fix(es): There is a logic error in io_uring's implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation. In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161.(CVE-2023-0240) A memory leak flaw and potential divide by zero and Integer overflow was found in the Linux kernel V4L2 and vivid test code functionality. This issue occurs when a user triggers ioctls, such as VIDIOC_S_DV_TIMINGS ioctl. This could allow a local user to crash the system if vivid test code enabled.(CVE-2023-0615) The Linux kernel does not correctly mitigate SMT attacks, as discovered through a strange pattern in the kernel API using STIBP as a mitigation[1 <https://docs.kernel.org/userspace-api/spec_ctrl.html>], leaving the process exposed for a short period of time after a syscall. The kernel also does not issue an IBPB immediately during the syscall. The ib_prctl_set [2 <https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/cpu/bugs.c#L1467>]function updates the Thread Information Flags (TIFs) for the task and updates the SPEC_CTRL MSR on the function __speculation_ctrl_update [3 <https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/process.c#L557>], but the IBPB is only issued on the next schedule, when the TIF bits are checked. This leaves the victim vulnerable to values already injected on the BTB, prior to the prctl syscall. The behavior is only corrected after a reschedule of the task happens. Furthermore, the kernel entrance (due to the syscall itself), does not issue an IBPB in the default scenarios (i.e., when the kernel protects itself via retpoline or eIBRS).(CVE-2023-0045) REMAP cmd of SVM driver can be used to remap read only memory as read-write, then cause read only memory/file modified..(CVE-2021-33639) An update for kernel is now available for openEuler-22.03-LTS. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High kernel https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144 https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2023-0240 https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2023-0615 https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2023-0045 https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33639 https://nvd.nist.gov/vuln/detail/CVE-2023-0240 https://nvd.nist.gov/vuln/detail/CVE-2023-0615 https://nvd.nist.gov/vuln/detail/CVE-2023-0045 https://nvd.nist.gov/vuln/detail/CVE-2021-33639 openEuler-22.03-LTS kernel-devel-5.10.0-60.83.0.107.oe2203.aarch64.rpm python3-perf-debuginfo-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-debuginfo-5.10.0-60.83.0.107.oe2203.aarch64.rpm perf-5.10.0-60.83.0.107.oe2203.aarch64.rpm perf-debuginfo-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-tools-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-debugsource-5.10.0-60.83.0.107.oe2203.aarch64.rpm bpftool-5.10.0-60.83.0.107.oe2203.aarch64.rpm bpftool-debuginfo-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-source-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-tools-devel-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-tools-debuginfo-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-headers-5.10.0-60.83.0.107.oe2203.aarch64.rpm python3-perf-5.10.0-60.83.0.107.oe2203.aarch64.rpm kernel-5.10.0-60.83.0.107.oe2203.src.rpm kernel-5.10.0-60.83.0.107.oe2203.x86_64.rpm kernel-tools-devel-5.10.0-60.83.0.107.oe2203.x86_64.rpm bpftool-5.10.0-60.83.0.107.oe2203.x86_64.rpm kernel-tools-debuginfo-5.10.0-60.83.0.107.oe2203.x86_64.rpm python3-perf-5.10.0-60.83.0.107.oe2203.x86_64.rpm kernel-debuginfo-5.10.0-60.83.0.107.oe2203.x86_64.rpm kernel-source-5.10.0-60.83.0.107.oe2203.x86_64.rpm python3-perf-debuginfo-5.10.0-60.83.0.107.oe2203.x86_64.rpm kernel-debugsource-5.10.0-60.83.0.107.oe2203.x86_64.rpm kernel-headers-5.10.0-60.83.0.107.oe2203.x86_64.rpm perf-5.10.0-60.83.0.107.oe2203.x86_64.rpm kernel-tools-5.10.0-60.83.0.107.oe2203.x86_64.rpm perf-debuginfo-5.10.0-60.83.0.107.oe2203.x86_64.rpm bpftool-debuginfo-5.10.0-60.83.0.107.oe2203.x86_64.rpm kernel-devel-5.10.0-60.83.0.107.oe2203.x86_64.rpm There is a logic error in io_uring s implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation. In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161. 2023-03-04 CVE-2023-0240 openEuler-22.03-LTS High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H kernel security update 2023-03-04 https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144 A memory leak flaw and potential divide by zero and Integer overflow was found in the Linux kernel V4L2 and vivid test code functionality. This issue occurs when a user triggers ioctls, such as VIDIOC_S_DV_TIMINGS ioctl. This could allow a local user to crash the system if vivid test code enabled. 2023-03-04 CVE-2023-0615 openEuler-22.03-LTS Medium 5.5 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H kernel security update 2023-03-04 https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144 The Linux kernel does not correctly mitigate SMT attacks, as discoveredthrough a strange pattern in the kernel API using STIBP as a mitigation[1<https://docs.kernel.org/userspace-api/spec_ctrl.html>], leaving theprocess exposed for a short period of time after a syscall. The kernel alsodoes not issue an IBPB immediately during the syscall.The ib_prctl_set [2<https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/cpu/bugs.c#L1467>]functionupdates the Thread Information Flags (TIFs) for the task and updates theSPEC_CTRL MSR on the function __speculation_ctrl_update [3<https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/process.c#L557>],but the IBPB is only issued on the next schedule, when the TIF bits arechecked. This leaves the victim vulnerable to values already injected onthe BTB, prior to the prctl syscall.The behavior is only corrected after a reschedule of the task happens.Furthermore, the kernel entrance (due to the syscall itself), does notissue an IBPB in the default scenarios (i.e., when the kernel protectsitself via retpoline or eIBRS). 2023-03-04 CVE-2023-0045 openEuler-22.03-LTS Medium 5.1 AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N kernel security update 2023-03-04 https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144 REMAP cmd of SVM driver can be used to remap read only memory as read-write, then cause read only memory/file modified. 2023-03-04 CVE-2021-33639 openEuler-22.03-LTS Medium 6.7 AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H kernel security update 2023-03-04 https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1144