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CVE-2026-98856

UnknownEPSS 0.17%

Last modified

CVE-2026-98856 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.17%

6.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= afd66255b9a48f5851326ddae50e2203fbf71dc9, < e29e819cacfb4e3cd56d41eb704ab4718d6d2915; >= afd66255b9a48f5851326ddae50e2203fbf71dc9, < ab9ed9faa67bf67383ff7e1479655e232a843c2b; >= afd66255b9a48f5851326ddae50e2203fbf71dc9, < 3b0f604df9e2b9a456f1ae5266a439998c4c8826; >= afd66255b9a48f5851326ddae50e2203fbf71dc9, < 3f968dcdf018861129f97910fa7bd680d939a9b0; >= afd66255b9a48f5851326ddae50e2203fbf71dc9, < 985a568171e7bdba6dcde3420d0e5bb515813457; >= afd66255b9a48f5851326ddae50e2203fbf71dc9, < 6745fa65f4115045431c0c15610e876855a04625; >= afd66255b9a48f5851326ddae50e2203fbf71dc9, < 526fac219e8b7d3369b43026bd0a1df51b811cd4; >= afd66255b9a48f5851326ddae50e2203fbf71dc9, < 7a39c732a22ec4a369af9e19fbe3d666ec83eec4
LinuxLinux2.6.34

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98856?
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.
How severe is CVE-2026-98856?
Severity scoring for CVE-2026-98856 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98856?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST