An update for kernel is now available for openEuler-20.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-2753 Final 1.0 1.0 2026-06-24 Initial 2026-06-24 2026-06-24 openEuler SA Tool V1.0 2026-06-24 kernel security update An update for kernel is now available for openEuler-20.03-LTS-SP4 The Linux Kernel, the operating system core itself. Security Fix(es): In the Linux kernel, the following vulnerability has been resolved: dm: fix a buffer overflow in ioctl processing Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status: 1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there 2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr); 3. The alignment doesn't check overflow, so outptr could point past the buffer end 4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf); 5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number 6. With "remaining" being high, the code writes more data past the end of the buffer Luckily, this bug has no security implications because: 1. Only root can issue device mapper ioctls 2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally(CVE-2026-46294) An update for kernel is now available for openEuler-20.03-LTS-SP4/openEuler-22.03-LTS-SP3/openEuler-24.03-LTS/openEuler-24.03-LTS-SP2. 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/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2753 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-46294 https://nvd.nist.gov/vuln/detail/CVE-2026-46294 openEuler-20.03-LTS-SP4 bpftool-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm bpftool-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm kernel-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm kernel-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm kernel-debugsource-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm kernel-devel-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm kernel-source-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm kernel-tools-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm kernel-tools-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm kernel-tools-devel-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm perf-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm perf-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm python2-perf-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm python2-perf-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm python3-perf-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm python3-perf-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.aarch64.rpm bpftool-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm bpftool-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-debugsource-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-devel-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-source-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-tools-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-tools-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-tools-devel-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm perf-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm perf-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm python2-perf-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm python2-perf-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm python3-perf-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm python3-perf-debuginfo-4.19.90-2606.4.0.0377.oe2003sp4.x86_64.rpm kernel-4.19.90-2606.4.0.0377.oe2003sp4.src.rpm In the Linux kernel, the following vulnerability has been resolved: dm: fix a buffer overflow in ioctl processing Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status: 1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there 2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr); 3. The alignment doesn't check overflow, so outptr could point past the buffer end 4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf); 5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number 6. With "remaining" being high, the code writes more data past the end of the buffer Luckily, this bug has no security implications because: 1. Only root can issue device mapper ioctls 2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally 2026-06-24 CVE-2026-46294 openEuler-20.03-LTS-SP4 High 7.0 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H kernel security update 2026-06-24 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2753