CVE-2024-46690 nfsd: fix nfsd4_deleg_getattr_conflict in presence of third party lease

What is CVE-2024-46690?

CVE-2024-46690 is a critical vulnerability in Linux kernel, published on 13 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix nfsd4_deleg_getattr_conflict in presence of third party lease

It is not safe to dereference fl->c.flc_owner without first confirming fl->fl_lmops is the expected manager. nfsd4_deleg_getattr_conflict() tests fl_lmops but largely ignores the result and assumes that flc_owner is an nfs4_delegation anyway. This is wrong.

With this patch we restore the "!= &nfsd_lease_mng_ops" case to behave as it did before the change mentioned below. This is the same as the current code, but without any reference to a possible delegation.

Which versions are affected by CVE-2024-46690?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-46690?

Apply the vendor's patch.

Is CVE-2024-46690 being exploited?

There is no known exploitation of CVE-2024-46690 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2024-46690, DEBIAN-CVE-2024-46690, GHSA-pfgc-2q82-vggq, UBUNTU-CVE-2024-46690.