Description
The smbhash function in fs/cifs/smbencrypt.c in the Linux kernel 4.9.x before 4.9.1 interacts incorrectly with the CONFIG_VMAP_STACK option, which allows local users to cause a denial of service (system crash or memory corruption) or possibly have unspecified other impact by leveraging use of more than one virtual page for a scatterlist.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.9.2-1 | — |
| Debian 13 | linux | 4.9.2-1 | — |
| Debian 12 | linux | 4.9.2-1 | — |
References
- 95714 vdb-entry
- [oss-security] 20170120 Re: CVE REQUEST: linux kernel: process with pgid zero able to crash kernel mailing-list
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.1
- https://github.com/torvalds/linux/commit/06deeec77a5a689cc94b21a8a91a76e42176685d
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06deeec77a5a689cc94b21a8a91a76e42176685d
- https://bugzilla.redhat.com/show_bug.cgi?id=1416104