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Vulnerability · Published Oct 18, 2026 · Assigned by Linux

CVE-2026-98856kprobes: Skip disarmed probes when checking optkprobe overlap

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 87.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-98856
Debian:13linux6.12.113-1DEBIAN-CVE-2026-98856
Debian:14linux7.2.10-1DEBIAN-CVE-2026-98856
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-98856
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98856
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-98856
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-98856
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-98856

Affected products (as reported)

VendorProductVersions
Linux Linux afd66255b9a48f5851326ddae50e2203fbf71dc9 – before e29e819cacfb4e3cd56d41eb704ab4718d6d2915afd66255b9a48f5851326ddae50e2203fbf71dc9 – before ab9ed9faa67bf67383ff7e1479655e232a843c2bafd66255b9a48f5851326ddae50e2203fbf71dc9 – before 3b0f604df9e2b9a456f1ae5266a439998c4c8826afd66255b9a48f5851326ddae50e2203fbf71dc9 – before 3f968dcdf018861129f97910fa7bd680d939a9b0afd66255b9a48f5851326ddae50e2203fbf71dc9 – before 985a568171e7bdba6dcde3420d0e5bb515813457afd66255b9a48f5851326ddae50e2203fbf71dc9 – before 6745fa65f4115045431c0c15610e876855a04625afd66255b9a48f5851326ddae50e2203fbf71dc9 – before 526fac219e8b7d3369b43026bd0a1df51b811cd4afd66255b9a48f5851326ddae50e2203fbf71dc9 – before 7a39c732a22ec4a369af9e19fbe3d666ec83eec4
Linux Linux 2.6.34

References