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CVE-2026-80734

8.8
High
EPSS 0.35%Patch availableSep 4, 2026

btrfs inode mapping bug can trigger kernel BUG/Oops causing host crash/DoS.

common questions

Is CVE-2026-80734 being exploited?

Not confirmed. CVE-2026-80734 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.35% probability of exploitation in the next 30 days.

How severe is CVE-2026-80734?

CVE-2026-80734 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-80734?

Yes. A fix has been recorded for CVE-2026-80734. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-80734 affect?

CVE-2026-80734 affects Linux kernel with btrfs enabled, Systems using btrfs filesystem, Distributions shipping affected kernels. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-80734?

Install the patched kernel release for your distro and reboot btrfs hosts.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Linux kernel with btrfs enabledSystems using btrfs filesystemDistributions shipping affected kernels
impact

File operations on btrfs can trigger a kernel BUG/Oops causing host crash (DoS) and potential data corruption; triggered by local/file I/O.

action required

Patch when possible

affected versions
Linux Linux
  • affected>= ecde48a1a6b3256bd49db8780bf37556b157783c and < 0d26249671171ab759cb4fdce673554a690fa655
  • affected>= ecde48a1a6b3256bd49db8780bf37556b157783c and < 0ef349734a93227b45f65fc50a3311d1cc5f03e9
  • affectedae584726e6eddf6cfbe49b3f4a78b3197716b6f8
  • affected>= 6.14.6 and < 6.15
  • affected6.15
vendor says fixed in< 6.15, >= 7.1.9 and <= 7.1.*, >= 7.2 and <= *

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
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