CVE-2024-53148 (GCVE-0-2024-53148)
Vulnerability from cvelistv5
Published
2024-12-24 11:28
Modified
2026-08-05 11:44
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: Flush partial mappings in error case If some remap_pfn_range() calls succeeded before one failed, we still have buffer pages mapped into the userspace page tables when we drop the buffer reference with comedi_buf_map_put(bm). The userspace mappings are only cleaned up later in the mmap error path. Fix it by explicitly flushing all mappings in our VMA on the error path. See commit 79a61cc3fc04 ("mm: avoid leaving partial pfn mappings around in error case").
References
Impacted products
Vendor Product Version
Linux Linux Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: Flush partial mappings in error case\n\nIf some remap_pfn_range() calls succeeded before one failed, we still have\nbuffer pages mapped into the userspace page tables when we drop the buffer\nreference with comedi_buf_map_put(bm). The userspace mappings are only\ncleaned up later in the mmap error path.\n\nFix it by explicitly flushing all mappings in our VMA on the error path.\n\nSee commit 79a61cc3fc04 (\"mm: avoid leaving partial pfn mappings around in\nerror case\")."
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              "value": "AV:L - The vulnerability is reached only via mmap(2) on a local comedi character device node (/dev/comediN); there is no network or physical-bus interface involved.\nAC:L - The attacker controls both sides of the condition \u2014 inducing the partial remap_pfn_range failure via memory pressure and racing a concurrent buffer free (BUFCONFIG/detach) \u2014 so per the UAF/attacker-controlled-race guidance this is Low.\nPR:L - Once a driver is attached (a common one-time privileged setup), an unprivileged local user with access to the device node can allocate a buffer and mmap it without any capability; the vulnerable comedi_mmap and buffer-resize paths have no CAP check.\nUI:N - The attacker performs the open, buffer allocation, and mmap entirely on their own; no victim action is required.\nS:U - The corruption stays within the kernel\u0027s own security authority (kernel-managed memory); no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The dangling userspace PTEs point at physical pages that are freed and reallocated to arbitrary kernel or other-process uses, giving the attacker a read primitive over reused memory.\nI:H - The stale mappings are writable (PAGE_SHARED), so userspace can write into freed/reallocated physical pages \u2014 an arbitrary write primitive suitable for privilege escalation.\nA:H - Dangling PTEs to reused physical pages readily corrupt kernel memory, causing oopses/panics and system instability."
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    "dateReserved": "2024-11-19T17:17:24.998Z",
    "dateUpdated": "2026-08-05T11:44:10.150Z",
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