PT-2021-8243 · Linux+2 · Linux Kernel+2
Anna Schumaker
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Published
2021-06-03
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Updated
2024-07-03
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CVE-2021-47259
CVSS v3.1
7.5
High
| Vector | AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions 4.13 through 5.10
Description
The issue is related to a use-after-free in the
nfs4 init client() function. KASAN reports a use-after-free when attempting to mount two different exports through two different NICs that belong to the same server. This could potentially impact the confidentiality, integrity, and availability of protected information. The problem seems to have arisen due to a change in the refcounting of the clp pointer, making the call to nfs put client() the last one.Recommendations
For Linux kernel versions 4.13 through 5.10, consider updating to a newer version that includes the fix for the use-after-free in
nfs4 init client(). As a temporary workaround, consider disabling the nfs4 init client() function until a patch is available. Restrict access to the vulnerable NFS module to minimize the risk of exploitation. Avoid using the nfs4 init client() function in scenarios where it could be exploited until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Linux Kernel
Suse