159 lines
8.3 KiB
JSON
159 lines
8.3 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-2026-74627",
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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": "2026-08-15T05:44:03.921Z",
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"datePublished": "2026-08-22T15:32:09.405Z",
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"dateUpdated": "2026-08-25T05:40:50.784Z"
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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": "2026-08-25T05:40:50.784Z"
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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\nnet: devmem: prevent net-iov / page mixing\n\nWe should either have net_iov or page backed frags in a single skb,\notherwise it blows up down the stack. Don't allow mixing in\nzerocopy_fill_skb_from_devmem()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is in zerocopy_fill_skb_from_devmem() reached only via local sendmsg() on TCP sockets (tcp_sendmsg_locked -> skb_zerocopy_iter_stream -> __zerocopy_sg_from_iter); remote peers cannot invoke this skb construction path without local process cooperation.\nAC:L - An attacker reliably triggers mixing by partially filling the TCP write-queue tail skb with page-backed zerocopy or copy data, then issuing MSG_ZEROCOPY+SCM_DEVMEM_DMABUF sendmsg on the same skb; no race or uncontrollable layout is required.\nPR:L - Exploitation requires SOCK_ZEROCOPY, netdev-genl NETDEV_CMD_BIND_TX dmabuf binding, and a netmem_tx-capable NIC; CAP_NET_ADMIN for netdev/dmabuf setup is obtainable inside user/network namespaces via unshare without init-namespace root.\nUI:N - No victim file open, mount, or interactive action is needed; the attacker configures devmem TX binding and drives the crafted sendmsg sequence on their own TCP socket.\nS:U - Impact is kernel frag-type confusion and faults during local TX processing on the same host; it does not cross VM, container, or IOMMU security boundaries to a different authority.\nC:H - Mixing page-backed and net_iov frags violates skb unreadability invariants; downstream frag walkers that assume uniform backing can dereference invalid pages via skb_frag_foreach_page, enabling kernel memory disclosure primitives.\nI:H - Creating an skb with both page and net_iov fragments is explicit frag-type confusion; the stack cannot safely manage mixed backing types, and corrupted skb metadata/refcounts can be leveraged for arbitrary kernel writes or control-flow hijacking.\nA:H - The fix commit states mixed frags blow up down the stack; malformed skbs reaching TX, checksum, GSO, or frag-unref paths can trigger kernel oops/panic on netmem_tx deployments (cloud/HPC mlx5, bnxt, gve hosts)."
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}
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]
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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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"net/core/datagram.c"
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],
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"versions": [
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{
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"version": "bd61848900bff597764238f3a8ec67c815cd316e",
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"lessThan": "e9bfe12b1d04c34c6fedcba21d9709b65c08aa33",
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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": "bd61848900bff597764238f3a8ec67c815cd316e",
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"lessThan": "ed08011ae0be88f16cceae190535d6c790c83b0c",
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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": "bd61848900bff597764238f3a8ec67c815cd316e",
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"lessThan": "53a43508ee332d8bffe40590c3d189c92a551f9f",
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"status": "affected",
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"versionType": "git"
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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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"net/core/datagram.c"
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],
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"versions": [
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{
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"version": "6.16",
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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": "6.16",
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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": "6.18.45",
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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": "7.1.9",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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": "6.16",
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"versionEndExcluding": "6.18.45"
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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": "6.16",
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"versionEndExcluding": "7.1.9"
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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": "6.16",
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"versionEndExcluding": "7.2"
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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/e9bfe12b1d04c34c6fedcba21d9709b65c08aa33"
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},
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{
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"url": "https://git.kernel.org/stable/c/ed08011ae0be88f16cceae190535d6c790c83b0c"
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},
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{
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"url": "https://git.kernel.org/stable/c/53a43508ee332d8bffe40590c3d189c92a551f9f"
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}
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],
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"title": "net: devmem: prevent net-iov / page mixing",
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"x_generator": {
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}
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} |