CVE-2022-49927 nfs4: Fix kmemleak when allocate slot failed
A memory leak in the Linux kernel NFS client allows attackers to cause denial of service by exhausting kernel memory during slot allocation failures.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-49927?
CVE-2022-49927 is a medium-severity memory corruption vulnerability in Linux kernel, published on 1 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
nfs4: Fix kmemleak when allocate slot failed
If one of the slot allocate failed, should cleanup all the other allocated slots, otherwise, the allocated slots will leak:
unreferenced object 0xffff8881115aa100 (size 64): comm ""mount.nfs"", pid 679, jiffies 4294744957 (age 115.037s) hex dump (first 32 bytes): 00 cc 19 73 81 88 ff ff 00 a0 5a 11 81 88 ff ff ...s......Z..... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000007a4c434a>] nfs4_find_or_create_slot+0x8e/0x130 [<000000005472a39c>] nfs4_realloc_slot_table+0x23f/0x270 [<00000000cd8ca0eb>] nfs40_init_client+0x4a/0x90 [<00000000128486db>] nfs4_init_client+0xce/0x270 [<000000008d2cacad>] nfs4_set_client+0x1a2/0x2b0 [<000000000e593b52>] nfs4_create_server+0x300/0x5f0 [<00000000e4425dd2>] nfs4_try_get_tree+0x65/0x110 [<00000000d3a6176f>] vfs_get_tree+0x41/0xf0 [<0000000016b5ad4c>] path_mount+0x9b3/0xdd0 [<00000000494cae71>] __x64_sys_mount+0x190/0x1d0 [<000000005d56bdec>] do_syscall_64+0x35/0x80 [<00000000687c9ae4>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
Weakness: CWE-401
Which versions are affected by CVE-2022-49927?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49927?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2022-49927 being exploited?
There is no known exploitation of CVE-2022-49927 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49927, GHSA-965c-2m8v-wcjh, UBUNTU-CVE-2022-49927.