CVE-2022-50334None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: hugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param() Syzkaller reports a null-ptr-deref bug as follows: ====================================================== KASA…
▾ 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:
hugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()
According to commit "vfs: parse: deal with zero length string value", kernel will set the param->string to null pointer in vfs_parse_fs_string() if fs string has zero length.
Yet the problem is that, hugetlbfs_parse_param() will dereference the param->string, without checking whether it is a null pointer. To be more specific, if hugetlbfs_parse_param() parses an illegal mount parameter, such as "size=,", kernel will constructs struct fs_parameter with null pointer in vfs_parse_fs_string(), then passes this struct fs_parameter to hugetlbfs_parse_param(), which triggers the above null-ptr-deref bug.
This patch solves it by adding sanity check on param->string in hugetlbfs_parse_param().
Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < fa71639873518e3587632ae58e25e4a96b57fa90Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < dcd28191be9bbf307ba51a5b485773a55b0037c4Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 9a8862820cbf1f18dca4f3b4c289d88561b3a384Linux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 965e8f8ae0f642b5528f5a82b7bcaf15a659d5bdLinux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < f2207145693ae5697a7b59e2add4b92f9e5b0e3cLinux >= 32021982a324dce93b4ae00c06213bf45fb319c8 < 26215b7ee923b9251f7bb12c4e5f09dc465d35f2Linux 5.1Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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