CVE-2026-98273: Linux kernel · x86/kprobes: Fix crash when probing CS CALL instructions
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in d8c6a18c0552135cbf0c696c9019b2979d0862c9 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in d8c6a18c0552135cbf0c696c9019b2979d0862c9, cfc1af3d054aaabee08f1f77c441b3533b082869, a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255 +1
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Linux kernel to d8c6a18c0552135cbf0c696c9019b2979d0862c9, cfc1af3d054aaabee08f1f77c441b3533b082869, a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255 or 5.11.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available in Linux kernel version 5.11. Users and administrators should upgrade affected Linux kernel versions to 5.11 or later to resolve this issue.
Description
A vulnerability in the Linux kernel's x86 kprobes subsystem causes a crash when probing CS CALL instructions using eBPF tools. The issue arises because the kprobe handler incorrectly assumes a fixed 5-byte CALL instruction length, while the CS-prefixed CALL instruction is 6 bytes long. This leads to an invalid exception return address and a kernel crash. The flaw affects Linux kernel versions 5.10.190 through before 5.11 and version 5.13. The issue has been fixed in version 5.11.