CVE-2019-19770 — In the Linux kernel 4

In the Linux kernel 4.19.83, there is a use-after-free (read) in the debugfs_remove function in fs/debugfs/inode.c (which is used to remove a file or directory in debugfs that was previously created with a call to another debugfs function such as debugfs_create_file). NOTE: Linux

01What is this vulnerability?

In the Linux kernel 4.19.83, there is a use-after-free (read) in the debugfs_remove function in fs/debugfs/inode.c (which is used to remove a file or directory in debugfs that was previously created with a call to another debugfs function such as debugfs_create_file). NOTE: Linux kernel developers dispute this issue as not being an issue with debugfs, instead this is an issue with misuse of…

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: 2019-12-12T19:39:10.000Z
• Last modified: 2024-08-05T02:25:12.647Z

09References

• bugzilla.kernel.org — https://bugzilla.kernel.org/show_bug.cgi?id=205713
• security.netapp.com — https://security.netapp.com/advisory/ntap-20200103-0001/
• lore.kernel.org — https://lore.kernel.org/linux-block/20200402000002.7442-1-mcgrof%40kernel.org/
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html