CVE-2023-42754: Kernel: ipv4: null pointer dereference in ipv4_send_dest_unreach()
Vulnerability summary
CVE-2023-42754 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in fedoraproject fedora. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 36.8% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 40 · Related 36Timeline
- 05-10-2023PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
A NULL pointer dereference flaw was found in the Linux kernel ipv4 stack. The socket buffer (skb) was assumed to be associated with a device before calling __ip_options_compile, which is not always the case if the skb is re-routed by ipvs. This issue may allow a local user with CAP_NET_ADMIN privileges to crash the system.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.43%
Chance of exploitation in the next 30 days
Percentile
37%
Versus all other CVEs
30-day change
Increase +0.02 pp
From 0.40% 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 (seclists.org)
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.
Ubuntu110 products
- linux< 4.4.0-248.282 | < 4.15.0-220.231 | < 5.4.0-169.187 | < 5.15.0-91.101
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 4.4.0-1125.131 | < 4.4.0-1163.178 | < 4.15.0-1163.176 | < 5.4.0-1116.126 | < 5.15.0-1051.56
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.1.55-1 | < 6.5.6-1
Fedoraproject1 product
- fedoraEOL37 | 38 | 39
Linux1 product
- linux_kernel< 6.6 | 6.6:rc1 | 6.6:rc2
Redhat1 product
- enterprise_linux8.0 | 9.0
5 vendors · 114 products
References
40 links- bugzilla.redhat.com/show_bug.cgi?id=2239845Issue TrackingX Refsource REDHATPatchThird Party Advisory
- lists.fedoraproject.org/archives/…X Transferred
- lists.fedoraproject.org/archives/…X Transferred
- lists.fedoraproject.org/archives/…X Transferred
