Use After Free in Linux
CVE-2023-52927
In the Linux kernel, the following vulnerability has been resolved: netfilter: allow exp not to be removed in nf_ct_find_expectation Currently nf_conntrack_in() calling nf_ct_find_expectation() will remove the exp from the hash table. However, in some scenario, we expect the exp not to be removed when the created ct will not be confirmed, like in OVS and TC conntrack in the following patches. This patch allows exp not to be removed by setting IPS_CONFIRMED in the status of the tmpl.
Vulnerability class: Use-After-Free
EPSS: 0.003 (22.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux — versions 1bc91a5ddf3eaea0e0ea957cccf3abdcfcace00e, 5.18, 0
- Linux Linux_kernel
- Debian Debian_linux — versions 11.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Broken Link)
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Broken Link)
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Technical Description, Exploit)
- af854a3a-2127-422b-91ae-364da2661108 (Issue Tracking, Third Party Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Frequently asked questions
- What is CVE-2023-52927?
- CVE-2023-52927 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 7.8/10. Published 2025-03-14.
- How severe is CVE-2023-52927?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2023-52927 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.