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Message-ID: <2025072555-CVE-2025-38424-500e@gregkh> Date: Fri, 25 Jul 2025 16:16:57 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-38424: perf: Fix sample vs do_exit() From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: perf: Fix sample vs do_exit() Baisheng Gao reported an ARM64 crash, which Mark decoded as being a synchronous external abort -- most likely due to trying to access MMIO in bad ways. The crash further shows perf trying to do a user stack sample while in exit_mmap()'s tlb_finish_mmu() -- i.e. while tearing down the address space it is trying to access. It turns out that we stop perf after we tear down the userspace mm; a receipie for disaster, since perf likes to access userspace for various reasons. Flip this order by moving up where we stop perf in do_exit(). Additionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER to abort when the current task does not have an mm (exit_mm() makes sure to set current->mm = NULL; before commencing with the actual teardown). Such that CPU wide events don't trip on this same problem. The Linux kernel CVE team has assigned CVE-2025-38424 to this issue. Affected and fixed versions =========================== Issue introduced in 3.7 with commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 and fixed in 5.4.295 with commit 7b8f3c72175c6a63a95cf2e219f8b78e2baad34e Issue introduced in 3.7 with commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 and fixed in 5.10.239 with commit 507c9a595bad3abd107c6a8857d7fd125d89f386 Issue introduced in 3.7 with commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 and fixed in 5.15.186 with commit a9f6aab7910a0ef2895797f15c947f6d1053160f Issue introduced in 3.7 with commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 and fixed in 6.1.142 with commit 975ffddfa2e19823c719459d2364fcaa17673964 Issue introduced in 3.7 with commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 and fixed in 6.6.95 with commit 2ee6044a693735396bb47eeaba1ac3ae26c1c99b Issue introduced in 3.7 with commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 and fixed in 6.12.35 with commit 456019adaa2f5366b89c868dea9b483179bece54 Issue introduced in 3.7 with commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 and fixed in 6.15.4 with commit 7311970d07c4606362081250da95f2c7901fc0db Issue introduced in 3.7 with commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 and fixed in 6.16-rc3 with commit 4f6fc782128355931527cefe3eb45338abd8ab39 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-2025-38424 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: kernel/events/core.c kernel/exit.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/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386 https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964 https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54 https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39
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