Security Digest · Vulnerability record · Known exploited
CVE-2024-1086: Linux Kernel Use-After-Free Vulnerability
Exploited in the wild (CISA KEV). A use-after-free vulnerability in the Linux kernel's netfilter: nftables component can be exploited to achieve local privilege escalation.
CISA KEV · added 2024-05-30 CVSS 7.8 High EPSS 28.1% · p98
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Linux Kernel. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-05-30, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-06-20; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns.
- EPSS 28.1%, percentile 98: FIRST’s model estimates a 28.1% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.
What it is
A use-after-free vulnerability in the Linux kernel's netfilter: nftables component can be exploited to achieve local privilege escalation. The nftverdictinit() function allows positive values as drop error within the hook verdict, and hence the nfhookslow() function can cause a double free vulnerability when NFDROP is issued with a drop error which resembles NFACCEPT. We recommend upgrading past commit f342de4e2f33e0e39165d8639387aa6c19dff660.
CISA’s summary
Linux kernel contains a use-after-free vulnerability in the netfilter: nf_tables component that allows an attacker to achieve local privilege escalation.
Weakness type: CWE-416.
Product: Linux Kernel · Assigned by: Google · Published: 2024-01-31
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Linux | Kernel | 3.15 < 6.8 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: local access needed
- Attack complexity: low
- Privileges required: low (any account)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2024-05-30; federal due date 2024-06-20. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 28.06% probability of exploitation activity in the next 30 days; percentile 98.
Timeline
- — CVE record published by Google
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- git.kernel.org git.kernel.org
Vulnerability records
- CVE.org record CVE-2024-1086 cve.org
- NVD entry CVE-2024-1086 nvd.nist.gov
Government
Other references from the CVE record and advisory
- kernel.dance kernel.dance
- lists.fedoraproject.org lists.fedoraproject.org
- github.com github.com
- news.ycombinator.com news.ycombinator.com
- pwning.tech pwning.tech
- openwall.com openwall.com
- openwall.com openwall.com
- openwall.com openwall.com
- openwall.com openwall.com
- openwall.com openwall.com
- security.netapp.com security.netapp.com
- lists.debian.org lists.debian.org
- lists.debian.org lists.debian.org
All exploited Linux vulnerabilities · Today’s Security Digest