CVE-2024-38558net: openvswitch: fix overwriting ct original tuple for ICMPv6
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc builds before 6a51ac92bf35d34b4996d6eb67e2fe469f573b11; 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc builds before 0b532f59437f688563e9c58bdc1436fefa46e3b5; 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc builds before 5ab6aecbede080b44b8e34720ab72050bf1e6982; from 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc before 483eb70f441e2df66ade78aa7217e6e4caadfef3; from 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc before 9ec8b0ccadb908d92f7ee211a4eff05fd932f3f6; from 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc before 78741b4caae1e880368cb2f5110635f3ce45ecfd; from 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc before 431e9215576d7b728f3f53a704d237a520092120; from 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc before d73fb8bddf89503c9fae7c42e50d44c89909aad6; and 1 more ranges | CNA record |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | before V3.1 | CISA ADP |
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name) | all versions not affected | CISA ADP |
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name) | before V3.1 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.11 before 4.19.316; from 4.20 before 5.4.278; from 5.5 before 5.10.219; from 5.11 before 5.15.161; from 5.16 before 6.1.93; from 6.2 before 6.6.33; from 6.7 before 6.8.12; from 6.9 before 6.9.3 | NVD |
References
- https://git.kernel.org/stable/c/6a51ac92bf35d34b4996d6eb67e2fe469f573b11patch
- https://git.kernel.org/stable/c/0b532f59437f688563e9c58bdc1436fefa46e3b5patch
- https://git.kernel.org/stable/c/5ab6aecbede080b44b8e34720ab72050bf1e6982patch
- https://git.kernel.org/stable/c/483eb70f441e2df66ade78aa7217e6e4caadfef3patch
- https://git.kernel.org/stable/c/9ec8b0ccadb908d92f7ee211a4eff05fd932f3f6patch
- https://git.kernel.org/stable/c/78741b4caae1e880368cb2f5110635f3ce45ecfdpatch
- https://git.kernel.org/stable/c/431e9215576d7b728f3f53a704d237a520092120patch
- https://git.kernel.org/stable/c/d73fb8bddf89503c9fae7c42e50d44c89909aad6patch
- https://git.kernel.org/stable/c/7c988176b6c16c516474f6fceebe0f055af5eb56patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.