{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"not set"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2026-23143","title":"Title"},{"category":"description","text":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_net: Fix misalignment bug in struct virtnet_info\n\nUse the new TRAILING_OVERLAP() helper to fix a misalignment bug\nalong with the following warning:\n\ndrivers/net/virtio_net.c:429:46: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]\n\nThis helper creates a union between a flexible-array member (FAM)\nand a set of members that would otherwise follow it (in this case\n`u8 rss_hash_key_data[VIRTIO_NET_RSS_MAX_KEY_SIZE];`). This\noverlays the trailing members (rss_hash_key_data) onto the FAM\n(hash_key_data) while keeping the FAM and the start of MEMBERS aligned.\nThe static_assert() ensures this alignment remains.\n\nNotice that due to tail padding in flexible `struct\nvirtio_net_rss_config_trailer`, `rss_trailer.hash_key_data`\n(at offset 83 in struct virtnet_info) and `rss_hash_key_data` (at\noffset 84 in struct virtnet_info) are misaligned by one byte. See\nbelow:\n\nstruct virtio_net_rss_config_trailer {\n        __le16                     max_tx_vq;            /*     0     2 */\n        __u8                       hash_key_length;      /*     2     1 */\n        __u8                       hash_key_data[];      /*     3     0 */\n\n        /* size: 4, cachelines: 1, members: 3 */\n        /* padding: 1 */\n        /* last cacheline: 4 bytes */\n};\n\nstruct virtnet_info {\n...\n        struct virtio_net_rss_config_trailer rss_trailer; /*    80     4 */\n\n        /* XXX last struct has 1 byte of padding */\n\n        u8                         rss_hash_key_data[40]; /*    84    40 */\n...\n        /* size: 832, cachelines: 13, members: 48 */\n        /* sum members: 801, holes: 8, sum holes: 31 */\n        /* paddings: 2, sum paddings: 5 */\n};\n\nAfter changes, those members are correctly aligned at offset 795:\n\nstruct virtnet_info {\n...\n        union {\n                struct virtio_net_rss_config_trailer rss_trailer; /*   792     4 */\n                struct {\n                        unsigned char __offset_to_hash_key_data[3]; /*   792     3 */\n                        u8         rss_hash_key_data[40]; /*   795    40 */\n                };                                       /*   792    43 */\n        };                                               /*   792    44 */\n...\n        /* size: 840, cachelines: 14, members: 47 */\n        /* sum members: 801, holes: 8, sum holes: 35 */\n        /* padding: 4 */\n        /* paddings: 1, sum paddings: 4 */\n        /* last cacheline: 8 bytes */\n};\n\nAs a result, the RSS key passed to the device is shifted by 1\nbyte: the last byte is cut off, and instead a (possibly\nuninitialized) byte is added at the beginning.\n\nAs a last note `struct virtio_net_rss_config_hdr *rss_hdr;` is also\nmoved to the end, since it seems those three members should stick\naround together. :)","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2026-23143","url":"https://www.suse.com/security/cve/CVE-2026-23143"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"}],"title":"SUSE CVE CVE-2026-23143","tracking":{"current_release_date":"2026-02-16T00:26:19Z","generator":{"date":"2026-02-16T00:26:19Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2026-23143","initial_release_date":"2026-02-16T00:26:19Z","revision_history":[{"date":"2026-02-16T00:26:19Z","number":"2","summary":"references added,severity changed from  to not set"}],"status":"interim","version":"2"}}}