CVE-2019-15666 — An issue was discovered in the Linux kernel before 5

An issue was discovered in the Linux kernel before 5.0.19. There is an out-of-bounds array access in __xfrm_policy_unlink, which will cause denial of service, because verify_newpolicy_info in net/xfrm/xfrm_user.c mishandles directory validation.

01What is this vulnerability?

An issue was discovered in the Linux kernel before 5.0.19. There is an out-of-bounds array access in __xfrm_policy_unlink, which will cause denial of service, because verify_newpolicy_info in net/xfrm/xfrm_user.c mishandles directory validation.

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: 2019-08-27T04:49:20.000Z
• Last modified: 2024-08-05T00:56:22.205Z

09References

• git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b8…
• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.19
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/09/msg00014.html
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/09/msg00015.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html
• security.netapp.com — https://security.netapp.com/advisory/ntap-20191004-0001/
• support.f5.com — https://support.f5.com/csp/article/K53420251?utm_source=f5support&amp%3Butm_medi…