An update for kernel is now available for openEuler-22.03-LTS-SP1 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-HotPatchSA-2024-1012 Final 1.0 1.0 2024-05-20 Initial 2024-05-20 2024-05-20 openEuler HotPatchSA Tool V1.0 2024-05-20 kernel security update An update for kernel is now available for openEuler-22.03-LTS-SP1 The Linux Kernel, the operating system core itself. Security Fix(es): In the Linux kernel, the following vulnerability has been resolved: bpf: Fix DEVMAP_HASH overflow check on 32-bit arches The devmap code allocates a number hash buckets equal to the next power of two of the max_entries value provided when creating the map. When rounding up to the next power of two, the 32-bit variable storing the number of buckets can overflow, and the code checks for overflow by checking if the truncated 32-bit value is equal to 0. However, on 32-bit arches the rounding up itself can overflow mid-way through, because it ends up doing a left-shift of 32 bits on an unsigned long value. If the size of an unsigned long is four bytes, this is undefined behaviour, so there is no guarantee that we'll end up with a nice and tidy 0-value at the end. Syzbot managed to turn this into a crash on arm32 by creating a DEVMAP_HASH with max_entries > 0x80000000 and then trying to update it. Fix this by moving the overflow check to before the rounding up operation.(CVE-2024-26885) An update for kernel is now available for openEuler-22.03-LTS-SP1. 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-HotPatchSA-2024-1012 https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2024-26885 https://nvd.nist.gov/vuln/detail/CVE-2024-26885 openEuler-22.03-LTS-SP1 kernel-5.10.0-136.12.0.86.oe2203sp1-ACC-1-6.src.rpm patch-kernel-5.10.0-136.12.0.86.oe2203sp1-ACC-1-6.x86_64.rpm patch-kernel-5.10.0-136.12.0.86.oe2203sp1-ACC-1-6.aarch64.rpm In the Linux kernel, the following vulnerability has been resolved:bpf: Fix DEVMAP_HASH overflow check on 32-bit archesThe devmap code allocates a number hash buckets equal to the next powerof two of the max_entries value provided when creating the map. Whenrounding up to the next power of two, the 32-bit variable storing thenumber of buckets can overflow, and the code checks for overflow bychecking if the truncated 32-bit value is equal to 0. However, on 32-bitarches the rounding up itself can overflow mid-way through, because itends up doing a left-shift of 32 bits on an unsigned long value. If thesize of an unsigned long is four bytes, this is undefined behaviour, sothere is no guarantee that we ll end up with a nice and tidy 0-value atthe end.Syzbot managed to turn this into a crash on arm32 by creating aDEVMAP_HASH with max_entries > 0x80000000 and then trying to update it.Fix this by moving the overflow check to before the rounding upoperation. 2024-05-20 CVE-2024-26885 openEuler-22.03-LTS-SP1 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H kernel security update 2024-05-20 https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-HotPatchSA-2024-1012