From bippy-d175d3acf727 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman To: Reply-to: , Subject: CVE-2024-35918: randomize_kstack: Improve entropy diffusion Description =========== In the Linux kernel, the following vulnerability has been resolved: randomize_kstack: Improve entropy diffusion The kstack_offset variable was really only ever using the low bits for kernel stack offset entropy. Add a ror32() to increase bit diffusion. The Linux kernel CVE team has assigned CVE-2024-35918 to this issue. Affected and fixed versions =========================== Issue introduced in 5.13 with commit 39218ff4c625 and fixed in 5.15.155 with commit dfb2ce952143 Issue introduced in 5.13 with commit 39218ff4c625 and fixed in 6.1.86 with commit e80b4980af26 Issue introduced in 5.13 with commit 39218ff4c625 and fixed in 6.6.27 with commit 300a2b9c2b28 Issue introduced in 5.13 with commit 39218ff4c625 and fixed in 6.8.6 with commit 6be74b1e21f8 Issue introduced in 5.13 with commit 39218ff4c625 and fixed in 6.9 with commit 9c573cd31343 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-35918 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: include/linux/randomize_kstack.h Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/dfb2ce952143de60dd756ed666901236c76cb3fa https://git.kernel.org/stable/c/e80b4980af2688d8ff69c157ffa773dd1f1eb02c https://git.kernel.org/stable/c/300a2b9c2b28282974ee300bb5d5025cbbb1f64c https://git.kernel.org/stable/c/6be74b1e21f8de4c48af772c2f658b464bfe6145 https://git.kernel.org/stable/c/9c573cd313433f6c1f7236fe64b9b743500c1628