CVE-2026-98856
Published: October 21, 2026Last modified: November 3, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: kprobes: Skip disarmed probes when checking optkprobe overlap On x86, an optkprobe at A replaces five bytes with a jump. If a disabled probe B is at A+2, get_optimized_kprobe() stops at B when arming a new probe C at A+4. It leaves A optimized: A A+1 A+2 A+3 A+4 A's jump | e9 | d0 | d1 | d2 | d3 | after C | e9 | d0 | d1 | d2 | cc | The INT3 for C overwrites the last byte of A's jump displacement, so execution can jump to the wrong address. B can have prepared optinsns while disarmed, but has no jump to unoptimize. Continue past disarmed and unprepared probes to find the active optimized probe before arming a probe in its jump.
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.191-r0) |
| 25 LTS | linux-lts | Fixed (6.12.115-r0) | |
| Stream | linux-lts | Fixed (6.18.58-r0) |
References
- https://git.kernel.org/stable/c/3b0f604df9e2b9a456f1ae5266a439998c4c8826
- https://git.kernel.org/stable/c/3f968dcdf018861129f97910fa7bd680d939a9b0
- https://git.kernel.org/stable/c/526fac219e8b7d3369b43026bd0a1df51b811cd4
- https://git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625
- https://git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4
- https://git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457
- https://git.kernel.org/stable/c/ab9ed9faa67bf67383ff7e1479655e232a843c2b
- https://git.kernel.org/stable/c/e29e819cacfb4e3cd56d41eb704ab4718d6d2915