ghsa-6p9w-8r99-f39c
Vulnerability from github
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.
{
"affected": [],
"aliases": [
"CVE-2025-38424"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-25T15:15:27Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix sample vs do_exit()\n\nBaisheng Gao reported an ARM64 crash, which Mark decoded as being a\nsynchronous external abort -- most likely due to trying to access\nMMIO in bad ways.\n\nThe crash further shows perf trying to do a user stack sample while in\nexit_mmap()\u0027s tlb_finish_mmu() -- i.e. while tearing down the address\nspace it is trying to access.\n\nIt turns out that we stop perf after we tear down the userspace mm; a\nreceipie for disaster, since perf likes to access userspace for\nvarious reasons.\n\nFlip this order by moving up where we stop perf in do_exit().\n\nAdditionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER\nto abort when the current task does not have an mm (exit_mm() makes\nsure to set current-\u003emm = NULL; before commencing with the actual\nteardown). Such that CPU wide events don\u0027t trip on this same problem.",
"id": "GHSA-6p9w-8r99-f39c",
"modified": "2025-07-25T15:30:54Z",
"published": "2025-07-25T15:30:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38424"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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