CVE-2019-18680 — An issue was discovered in the Linux kernel 4

An issue was discovered in the Linux kernel 4.4.x before 4.4.195. There is a NULL pointer dereference in rds_tcp_kill_sock() in net/rds/tcp.c that will cause denial of service, aka CID-91573ae4aed0.

01What is this vulnerability?

An issue was discovered in the Linux kernel 4.4.x before 4.4.195. There is a NULL pointer dereference in rds_tcp_kill_sock() in net/rds/tcp.c that will cause denial of service, aka CID-91573ae4aed0.

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: 2019-11-04T14:13:32.000Z
• Last modified: 2024-08-05T02:02:38.254Z

09References

• lkml.org — https://lkml.org/lkml/2019/9/18/337
• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.195
• github.com — https://github.com/torvalds/linux/commit/91573ae4aed0a49660abdad4d42f2a0db995ee5…
• git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=9157…
• security.netapp.com — https://security.netapp.com/advisory/ntap-20191205-0001/