Use After Free vulnerability in Linux kernel traffic control index filter (tcindex) allows Privilege Escalation. The imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when 'tcf_exts_exec()' is called with the destroyed tcf_ext. A local attacker user can use this vulnerability to elevate its privileges to root. This issue affects Linux Kernel: from 4.14 before git commit ee059170b1f7e94e55fa6cadee544e176a6e59c2.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://kernel.dance/#ee059170b1f7e94e55fa6cadee544e176a6e59c2 | patch vendor advisory |
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ee059170b1f7e94e55fa6cadee544e176a6e59c2 | patch vendor advisory |
| http://www.openwall.com/lists/oss-security/2023/04/11/3 | mailing list |
| https://security.netapp.com/advisory/ntap-20230427-0004/ | third party advisory |
| https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html | third party advisory mailing list |
| https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html | third party advisory mailing list |