CVE-2023-52927: netfilter: allow exp not to be removed in nf_ct_find_expectation
Vulnerability summary
CVE-2023-52927 is a high (CVSS 7.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 24.6% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 41 · Related 38Timeline
- 14-03-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.32%
Chance of exploitation in the next 30 days
Percentile
25%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.31% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (seadragnol.github.io)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu117 products
- linuxAll versions (No fix recorded) | < 4.15.0-237.249 | < 5.4.0-215.235 | < 5.15.0-139.149
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1180.193 | < 5.4.0-1145.155 | < 5.15.0-1083.90
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.133-1 | < 6.6.8-1
- debian_linuxEOL11.0
Linux2 products
- linux≥ 1bc91a5ddf3eaea0e0ea957cccf3abdcfcace00e, < 3fa58a6fbd1e9e5682d09cdafb08fba004cb12ec | ≥ 1bc91a5ddf3eaea0e0ea957cccf3abdcfcace00e, < 4914109a8e1e494c6aa9852f9e84ec77a5fc643f | 5.18
- linux_kernel≥ 5.18, < 6.1.130 | ≥ 6.2, < 6.6
3 vendors · 121 products
