CVE-2024-38558 — net: openvswitch: fix overwriting ct original tuple for ICMPv6
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix overwriting ct original tuple for ICMPv6 OVS_PACKET_CMD_EXECUTE has 3 main attributes: - OVS_PACKET_ATTR_KEY - Packet metadata in a netlink format. - OVS_PACKET_ATTR_PACKET - Binary packet content. - OVS_PACKET_ATTR_ACTIONS - Actions to execute on the packet. OVS_PACKET_ATTR_KEY is parsed first to populate sw_flow_key structure with the metadata like conntrack state, input port, recirculation id, etc. Then the packet itself gets parsed to populate the rest of the keys from the packet headers. Whenever the packet parsing code starts parsing the ICMPv6 header, it first zeroes out fields in the key corresponding to Neighbor Discovery information even if it is not an ND packet. It is an 'ipv6.nd' field. However, the 'ipv6' is a union that shares the space between 'nd' and 'ct_orig' that holds the original tuple conntrack metadata parsed from the OVS_PACKET_ATTR_KEY. ND packets should not normally have conntrack state, so it's fine to share the space, but normal ICMPv6 Echo packets or maybe other types of ICMPv6 can have the state attached and it should not be overwritten. The issue results in all but the last 4 bytes of the destination address being wiped from the original conntrack tuple leading to incorrect packet matching and potentially executing wrong actions in case this packet recirculates within the datapath or goes back to userspace. ND fields should not be accessed in non-ND packets, so not clearing them should be fine. Executing memset() only for actual ND packets to avoid the issue. Initializing the whole thing before parsing is needed because ND packet may not contain all the options. The issue only affects the OVS_PACKET_CMD_EXECUTE path and doesn't affect packets entering OVS datapath from network interfaces, because in this case CT metadata is populated from skb after the packet is already parsed.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.8% (30-day exploitation probability)+8
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
- Apply the fixed version or the patch documented under Remediation.
- Search available logs for exploit probes matching the vulnerability class (logic error), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux |
≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < 0b532f59437f688563e9c58bdc1436fefa46e3b5version 4.11≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < 7c988176b6c16c516474f6fceebe0f055af5eb56≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < d73fb8bddf89503c9fae7c42e50d44c89909aad6≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < 431e9215576d7b728f3f53a704d237a520092120≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < 78741b4caae1e880368cb2f5110635f3ce45ecfd≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < 9ec8b0ccadb908d92f7ee211a4eff05fd932f3f6≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < 483eb70f441e2df66ade78aa7217e6e4caadfef3 and 2 more≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < 5ab6aecbede080b44b8e34720ab72050bf1e6982≥ 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc and < 6a51ac92bf35d34b4996d6eb67e2fe469f573b11 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
| Linux | Linux Kernel | ≥ 4.11 and < 4.19.316≥ 6.9 and < 6.9.3≥ 6.7 and < 6.8.12≥ 6.2 and < 6.6.33≥ 5.16 and < 6.1.93≥ 5.11 and < 5.15.161≥ 5.5 and < 5.10.219≥ 4.20 and < 5.4.278 | Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 10.0 | CVSS 3.1 | Critical | 3.9 | 6.0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database |
| 10.0 | CVSS 3.1 | Critical | — | — | Linux via CVE Program (cve.org) e CISA ADP |
| 5.5 | CVSS 3.1 | Medium | 1.8 | 3.6 | nvd@nist.gov via NIST National Vulnerability Database |
| 5.5 | CVSS 3.1 | Medium | — | — | GitHub, Inc. via GitHub Security Advisories |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 14, 2026 → Oct 15, 2026 · 2 reading(s) · max 0.82%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · linux/linux
- SSVC assessment updated
- Record published
- Fix documented
- Affected products added · linux/linux kernel
- CVSS changed · 5.5
- Source status changed · → Modified
- Record created in this database
- 2024
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 14, 2026 – Oct 14, 2026
- 1× Official description updated · Oct 14, 2026 – Oct 14, 2026
References
14 on the record
- git.kernel.org/stable/c/431e9215576d7b728f3f53a704d237a520092120
- git.kernel.org/stable/c/7c988176b6c16c516474f6fceebe0f055af5eb56
- git.kernel.org/stable/c/6a51ac92bf35d34b4996d6eb67e2fe469f573b11
- git.kernel.org/stable/c/483eb70f441e2df66ade78aa7217e6e4caadfef3
- git.kernel.org/stable/c/d73fb8bddf89503c9fae7c42e50d44c89909aad6
- git.kernel.org/stable/c/9ec8b0ccadb908d92f7ee211a4eff05fd932f3f6
- git.kernel.org/stable/c/5ab6aecbede080b44b8e34720ab72050bf1e6982
- git.kernel.org/stable/c/0b532f59437f688563e9c58bdc1436fefa46e3b5
- git.kernel.org/stable/c/78741b4caae1e880368cb2f5110635f3ce45ecfd
- github.com/advisories/GHSA-v5cj-xc9v-xg6m
- cert-portal.siemens.com/productcert/html/ssa-613116.html
- lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- nvd.nist.gov/vuln/detail/CVE-2024-38558
- cert-portal.siemens.com/productcert/html/ssa-265688.html
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 16h
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 16h
- Unknown CVE-2026-98431 RDMA/uverbs: Fix mmap_lock/disassociation_lock circular dependency 1d
- Unknown CVE-2026-98430 RDMA/efa: Keep admin queues alive while IRQ is registered 1d
- Unknown CVE-2026-98429 RDMA/efa: Keep EQ resources alive while IRQ is registered 1d
- Unknown CVE-2026-98428 ALSA: usb: 6fire: Avoid embedded URBs 1d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2024-38558 is "net: openvswitch: fix overwriting ct original tuple for ICMPv6", rated Medium. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.5 describes technical severity. EPSS 0.82% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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