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Message-ID: <2024102103-CVE-2024-47722-dc6e@gregkh> Date: Mon, 21 Oct 2024 14:16:01 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-47722: xen: use correct end address of kernel for conflict checking Description =========== In the Linux kernel, the following vulnerability has been resolved: xen: use correct end address of kernel for conflict checking When running as a Xen PV dom0 the kernel is loaded by the hypervisor using a different memory map than that of the host. In order to minimize the required changes in the kernel, the kernel adapts its memory map to that of the host. In order to do that it is checking for conflicts of its load address with the host memory map. Unfortunately the tested memory range does not include the .brk area, which might result in crashes or memory corruption when this area does conflict with the memory map of the host. Fix the test by using the _end label instead of __bss_stop. The Linux kernel CVE team has assigned CVE-2024-47722 to this issue. Affected and fixed versions =========================== Issue introduced in 4.3 with commit 808fdb71936c and fixed in 5.10.227 with commit cb9134aa0998 Issue introduced in 4.3 with commit 808fdb71936c and fixed in 5.15.168 with commit ed3e8cc9159a Issue introduced in 4.3 with commit 808fdb71936c and fixed in 6.1.113 with commit 6434af166441 Issue introduced in 4.3 with commit 808fdb71936c and fixed in 6.6.54 with commit cafeba3c2a1f Issue introduced in 4.3 with commit 808fdb71936c and fixed in 6.10.13 with commit aee96b588070 Issue introduced in 4.3 with commit 808fdb71936c and fixed in 6.11.2 with commit d9ab6bb136ad Issue introduced in 4.3 with commit 808fdb71936c and fixed in 6.12-rc1 with commit fac1bceeeb04 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-2024-47722 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: arch/x86/xen/setup.c 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/cb9134aa0998304a8521eafebe5ee486038698b3 https://git.kernel.org/stable/c/ed3e8cc9159ae956fb0ac858496f66c803d5bbc8 https://git.kernel.org/stable/c/6434af166441a998644ce961a630948ed5b986ba https://git.kernel.org/stable/c/cafeba3c2a1f015e26feb5629ae696e84cfb5ec9 https://git.kernel.org/stable/c/aee96b588070609dbce40e80899019a6d264069f https://git.kernel.org/stable/c/d9ab6bb136adacc3c25de2032baf89bbad6ca7f8 https://git.kernel.org/stable/c/fac1bceeeb04886fc2ee952672e6e6c85ce41dca
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