CVE-2021-46960 cifs: Return correct error code from smb2_get_enc_key
A bug in the Linux kernel CIFS module returns an incorrect error code, triggering a kernel warning and potential instability during file operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-46960?
CVE-2021-46960 is a high-severity vulnerability in Linux kernel, published on 27 Feb 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:
cifs: Return correct error code from smb2_get_enc_key
Avoid a warning if the error percolates back up:
[440700.376476] CIFS VFS: \\otters.example.com crypt_message: Could not get encryption key [440700.386947] ------------[ cut here ]------------ [440700.386948] err = 1 [440700.386977] WARNING: CPU: 11 PID: 2733 at /build/linux-hwe-5.4-p6lk6L/linux-hwe-5.4-5.4.0/lib/errseq.c:74 errseq_set+0x5c/0x70 ... [440700.397304] CPU: 11 PID: 2733 Comm: tar Tainted: G OE 5.4.0-70-generic #78~18.04.1-Ubuntu ... [440700.397334] Call Trace: [440700.397346] __filemap_set_wb_err+0x1a/0x70 [440700.397419] cifs_writepages+0x9c7/0xb30 [cifs] [440700.397426] do_writepages+0x4b/0xe0 [440700.397444] __filemap_fdatawrite_range+0xcb/0x100 [440700.397455] filemap_write_and_wait+0x42/0xa0 [440700.397486] cifs_setattr+0x68b/0xf30 [cifs] [440700.397493] notify_change+0x358/0x4a0 [440700.397500] utimes_common+0xe9/0x1c0 [440700.397510] do_utimes+0xc5/0x150 [440700.397520] __x64_sys_utimensat+0x88/0xd0
Which versions are affected by CVE-2021-46960?
It affects 1 product.
Linux distribution packages (40)
bpftool Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
bpftool-debuginfo Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-abi-stablelists Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-core Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-core Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-debuginfo Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-devel Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-modules Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-modules-extra Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debuginfo Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debuginfo-common-x86_64 Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-devel Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-doc Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-modules Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-modules-extra Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-tools Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-tools-debuginfo Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-tools-libs Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
perf Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
perf-debuginfo Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
python3-perf Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
python3-perf-debuginfo Red Hat:rhel_aus:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
bpftool Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
bpftool-debuginfo Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-abi-stablelists Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-core Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-core Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-debuginfo Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-devel Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-modules Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debug-modules-extra Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debuginfo Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debuginfo-common-aarch64 Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debuginfo-common-ppc64le Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debuginfo-common-s390x Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
kernel-debuginfo-common-x86_64 Red Hat:rhel_e4s:8.6::baseos | All versions | 0:4.18.0-372.139.1.el8_6 |
Products include Linux kernel.
How do I fix CVE-2021-46960?
Apply the vendor's patch.
Is CVE-2021-46960 being exploited?
There is no known exploitation of CVE-2021-46960 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-46960, GHSA-cxc6-784q-9f49, RHSA-2025:2265, UBUNTU-CVE-2021-46960.