kprobes: Skip disarmed probes when checking optkprobe overlap
Summary
| CVE | CVE-2026-98856 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-18 16:17:40 UTC |
| Updated | 2026-10-30 13:21:31 UTC |
| 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. |
Risk And Classification
EPSS: 0.001770000 probability, percentile 0.073200000 (date 2026-11-01)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected afd66255b9a48f5851326ddae50e2203fbf71dc9 e29e819cacfb4e3cd56d41eb704ab4718d6d2915 git | Not specified |
| CNA | Linux | Linux | affected afd66255b9a48f5851326ddae50e2203fbf71dc9 ab9ed9faa67bf67383ff7e1479655e232a843c2b git | Not specified |
| CNA | Linux | Linux | affected afd66255b9a48f5851326ddae50e2203fbf71dc9 3b0f604df9e2b9a456f1ae5266a439998c4c8826 git | Not specified |
| CNA | Linux | Linux | affected afd66255b9a48f5851326ddae50e2203fbf71dc9 3f968dcdf018861129f97910fa7bd680d939a9b0 git | Not specified |
| CNA | Linux | Linux | affected afd66255b9a48f5851326ddae50e2203fbf71dc9 985a568171e7bdba6dcde3420d0e5bb515813457 git | Not specified |
| CNA | Linux | Linux | affected afd66255b9a48f5851326ddae50e2203fbf71dc9 6745fa65f4115045431c0c15610e876855a04625 git | Not specified |
| CNA | Linux | Linux | affected afd66255b9a48f5851326ddae50e2203fbf71dc9 526fac219e8b7d3369b43026bd0a1df51b811cd4 git | Not specified |
| CNA | Linux | Linux | affected afd66255b9a48f5851326ddae50e2203fbf71dc9 7a39c732a22ec4a369af9e19fbe3d666ec83eec4 git | Not specified |
| CNA | Linux | Linux | affected 2.6.34 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.34 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.273 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.224 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.191 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.160 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.113 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.56 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.10 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/ab9ed9faa67bf67383ff7e1479655e232a843c2b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3b0f604df9e2b9a456f1ae5266a439998c4c8826 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/526fac219e8b7d3369b43026bd0a1df51b811cd4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3f968dcdf018861129f97910fa7bd680d939a9b0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e29e819cacfb4e3cd56d41eb704ab4718d6d2915 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.