149 lines
8.9 KiB
JSON
149 lines
8.9 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-23143",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-01-13T15:37:45.973Z",
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"datePublished": "2026-02-14T15:36:08.834Z",
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"dateUpdated": "2026-10-21T12:38:54.971Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-21T12:38:54.971Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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. :)"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/virtio_net.c"
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],
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"versions": [
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{
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"version": "4c47aff10f6f0a2506dc2126c17ccd4c42bfa211",
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"lessThan": "d1e9614a142eff34c93e94a15a71ad0e806799c4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed3100e90d0d120a045a551b85eb43cf2527e885",
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"lessThan": "ae48108c2310f1dd700e0dbb655c2f1d92ed00fc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ed3100e90d0d120a045a551b85eb43cf2527e885",
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"lessThan": "4156c3745f06bc197094b9ee97a9584e69ed00bf",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.12.91",
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"lessThan": "6.12.114",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/virtio_net.c"
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],
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"versions": [
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{
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"version": "6.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.7",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12.91",
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"versionEndExcluding": "6.12.114"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "6.18.7"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "6.19"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/d1e9614a142eff34c93e94a15a71ad0e806799c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/ae48108c2310f1dd700e0dbb655c2f1d92ed00fc"
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},
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{
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"url": "https://git.kernel.org/stable/c/4156c3745f06bc197094b9ee97a9584e69ed00bf"
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}
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],
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"title": "virtio_net: Fix misalignment bug in struct virtnet_info",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |