CVE-2018-12896
Description
An issue was discovered in the Linux kernel through 4.17.3. An Integer Overflow in kernel/time/posix-timers.c in the POSIX timer code is caused by the way the overrun accounting works. Depending on interval and expiry time values, the overrun can be larger than INT_MAX, but the accounting is int based. This basically makes the accounting values, which are visible to user space via timer_getoverrun(2) and siginfo::si_overrun, random. For example, a local user can cause a denial of service (signed integer overflow) via crafted mmap, futex, timer_create, and timer_settime system calls.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-12896
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-12896.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 4.18.20-1 |
| debian | bullseye | fixed | 4.18.20-1 |
| debian | forky | fixed | 4.18.20-1 |
| debian | sid | fixed | 4.18.20-1 |
| debian | trixie | fixed | 4.18.20-1 |
References
Verify integrity in audit chain (admin only). AS-IS.