CVE-2017-18193 — fs/f2fs/extent_cache

fs/f2fs/extent_cache.c in the Linux kernel before 4.13 mishandles extent trees, which allows local users to cause a denial of service (BUG) via an application with multiple threads.

01What is this vulnerability?

fs/f2fs/extent_cache.c in the Linux kernel before 4.13 mishandles extent trees, which allows local users to cause a denial of service (BUG) via an application with multiple threads.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-02-22T15:00:00.000Z
• Last modified: 2024-08-05T21:13:49.107Z

09References

• git.kernel.org — http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dad48e…
• usn.ubuntu.com — https://usn.ubuntu.com/3654-1/
• github.com — https://github.com/torvalds/linux/commit/dad48e73127ba10279ea33e6dbc8d3905c4d31c…
• www.debian.org — https://www.debian.org/security/2018/dsa-4188
• www.securityfocus.com — http://www.securityfocus.com/bid/103147
• usn.ubuntu.com — https://usn.ubuntu.com/3654-2/
• usn.ubuntu.com — https://usn.ubuntu.com/3656-1/