CVE-2026-57973: Time-of-check time-of-use (toctou) race condition in Windows Subsystem for Linux allows an authorized attacker

Q: How do I fix CVE-2026-57973?

windows subsystem for linux: upgrade to 2.7.10. Exact commands for each OS are on this page.

Q: Is CVE-2026-57973 being exploited?

CVE-2026-57973 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57973 affect?

CVE-2026-57973 affects windows subsystem for linux. Severity is medium (CVSS 6.3). Time-of-check time-of-use (toctou) race condition in Windows Subsystem for Linux allows an authorized attacker to perform tampering locally.

Q: How urgent is CVE-2026-57973?

Priority 30/100. On your watchlist

Routine

MEDIUM 6.3WATCHLISTUPGRADE

CVE-2026-57973 is a medium-severity flaw (CVSS 6.3) affecting windows subsystem for linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Time-of-check time-of-use (toctou) race condition in Windows Subsystem for Linux allows an authorized attacker to perform tampering locally.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-367
Published	2026-07-14
Last modified	2026-10-24

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 18:18 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

microsoft windows subsystem for linux UPGRADE

Affected: < 2.7.10

Fixed in: 2.7.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy windows-subsystem-for-linux || rpm -q windows-subsystem-for-linux || windows-subsystem-for-linux --version

2. UPGRADE to 2.7.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade windows-subsystem-for-linux

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade windows-subsystem-for-linux

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57973?

windows subsystem for linux: upgrade to 2.7.10. Exact commands for each OS are on this page.

Is CVE-2026-57973 being exploited?

CVE-2026-57973 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57973 affect?

CVE-2026-57973 affects windows subsystem for linux. Severity is medium (CVSS 6.3). Time-of-check time-of-use (toctou) race condition in Windows Subsystem for Linux allows an authorized attacker to perform tampering locally.

How urgent is CVE-2026-57973?

Priority 30/100. On your watchlist

Software pages

Windows vulnerabilities

Related CVEs

CVE-2026-57968 HIGH 7.8 UPGRADE Buffer over-read in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.

References

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