CVE-2023-53171None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: vfio/type1: prevent underflow of locked_vm via exec() When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
vfio/type1: prevent underflow of locked_vm via exec()
When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, and loses the count from existing dma mappings. If the user later unmaps a dma mapping, locked_vm underflows to a large unsigned value, and a subsequent dma map request fails with ENOMEM in __account_locked_vm.
To avoid underflow, grab and save the mm at the time a dma is mapped. Use that mm when adjusting locked_vm, rather than re-acquiring the saved task's mm, which may have changed. If the saved mm is dead, do nothing.
locked_vm is incremented for existing mappings in a subsequent patch.
Linux >= 73fa0d10d077d9521ee2dace2307ae2c9a965336 < 5a271242716846cc016736fb76be2b40ee49b0c3Linux >= 73fa0d10d077d9521ee2dace2307ae2c9a965336 < eafb81c50da899dd80b340c841277acc4a1945b7Linux >= 73fa0d10d077d9521ee2dace2307ae2c9a965336 < a6b2aabe664098d5cf877ae0fd96459464a30e17Linux >= 73fa0d10d077d9521ee2dace2307ae2c9a965336 < b0790dff0760b7734cf0961f497ad64628ca550bLinux >= 73fa0d10d077d9521ee2dace2307ae2c9a965336 < 046eca5018f8a5dd1dc2cedf87fb5843b9ea3026Linux 3.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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