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CVE-2026-98888 Linux CVE debrief

A Linux kernel vulnerability allows reentering kprobes while single-stepping on arm64. This change enables safe reentry of kprobes during single-step instructions, enhancing kernel debugging capabilities. The vulnerability affects Linux kernel developers and maintainers, who should assess exposure and apply updates to ensure safe kprobe reentry. The fix allows for safe reentry of kprobes during single-step instructions, enhancing kernel debugging capabilities. This change also requires saving saved_irqflag in struct prev_kprobe.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-23
Original CVE updated
2026-10-26
Advisory published
2026-10-23
Advisory updated
2026-10-26

Who should care

Linux kernel developers and maintainers, system administrators responsible for Linux kernel updates, and security teams should assess exposure and apply updates to ensure safe kprobe reentry. They should verify kprobe configurations for safe reentry, apply kernel updates to prevent kprobe conflicts, and review system logs for kprobe-related issues.

Why it matters

This Linux kernel vulnerability allows for safe reentry of kprobes during single-step instructions on arm64, enhancing kernel debugging capabilities. Linux kernel developers and maintainers should assess exposure and apply updates to ensure safe kprobe reentry.

  • Verify kprobe configurations for safe reentry
  • Apply kernel updates to prevent kprobe conflicts
  • Review system logs for kprobe-related issues

Technical summary

The Linux kernel vulnerability allows reentering kprobes while single-stepping on arm64, enhancing kernel debugging capabilities. The fix enables safe reentry of kprobes during single-step instructions, allowing Linux kernel developers and maintainers to assess exposure and apply updates to ensure safe kprobe reentry. The vulnerability affects Linux kernel developers and maintainers, who should verify kprobe configurations for safe reentry and apply kernel updates to prevent kprobe conflicts. The change also requires saving saved_irqflag in struct prev_kprobe.

Defensive priority

Apply kernel updates to ensure safe kprobe reentry

Recommended defensive actions

  • Apply kernel updates to ensure safe kprobe reentry
  • Review Linux kernel versions for exposure
  • Verify system configurations for kprobe usage
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and source item provide details on the Linux kernel vulnerability and its fix. The vulnerability allows reentering kprobes while single-stepping on arm64, enhancing kernel debugging capabilities. Linux kernel developers and maintainers should verify kprobe configurations for safe reentry, apply kernel updates to prevent kprobe conflicts, and review system logs for kprobe-related issues. The fix enables safe reentry of kprobes during single-step instructions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-98888 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-98888

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-98888 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-98888

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • arm64: kprobes: Allow reentering kprobes while single-stepping

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/98xxx/CVE-2026-98888.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/bb0fe9121aa0824211aafa33c7d0151fd25ddb75

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/f96a0606de6bcc8d937b80e6470fd7a174c17e26

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/1f342b3e44c3035a837b53b217d816f7511c0d0a

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/c8e84e292ed4cfc199824146da71bb4397b02a1f

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/68774caca799e9695db56d426c69acebd041c2ed

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/a21bf9cb893126e8d9730995708d0be5eb167652

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/23f851ac0078a908bf3422d6467ebc1db5828c46

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.