CVE-2019-19036 — btrfs_root_node in fs/btrfs/ctree

btrfs_root_node in fs/btrfs/ctree.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because rcu_dereference(root->node) can be zero.

01What is this vulnerability?

btrfs_root_node in fs/btrfs/ctree.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because rcu_dereference(root->node) can be zero.

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: 2019-11-21T02:00:18.000Z
• Last modified: 2024-08-05T02:09:37.581Z

09References

• github.com — https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19036
• security.netapp.com — https://security.netapp.com/advisory/ntap-20191205-0001/
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
• usn.ubuntu.com — https://usn.ubuntu.com/4414-1/
• usn.ubuntu.com — https://usn.ubuntu.com/4439-1/