159 lines
8.9 KiB
JSON
159 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-2026-64124",
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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": "2026-07-19T07:54:57.036Z",
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"datePublished": "2026-07-19T15:40:21.879Z",
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"dateUpdated": "2026-08-05T12:39:30.822Z"
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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": "2026-08-05T12:39:30.822Z"
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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: reject dma-buf bind with non-page-aligned size or SG length\n\nnet_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_len() to be\nPAGE_SIZE multiples without checking:\n\n - tx_vec is sized dmabuf->size / PAGE_SIZE, and\n net_devmem_get_niov_at() only bounds-checks virt_addr < dmabuf->size\n before indexing tx_vec[virt_addr / PAGE_SIZE]. With size =\n N*PAGE_SIZE + r (1 <= r < PAGE_SIZE), sendmsg() at iov_base =\n N*PAGE_SIZE passes the bound check and reads tx_vec[N] -- one past.\n\n - owner->area.num_niovs = len / PAGE_SIZE while gen_pool_add_owner()\n covers the full byte len, so a non-page-multiple non-final sg\n desyncs num_niovs from the gen_pool region for every later sg, on\n both RX and TX.\n\ndma-buf does not require page-aligned sizes, so the bind path has to\nenforce what its own indexing assumes. Reject both with -EINVAL.\n\nThe size check is TX-only (only tx_vec is sized off dmabuf->size); the\nSG-length check covers both directions."
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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:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 - Exploitation requires local syscalls—NETLINK_GENERIC netdev bind operations and sendmsg/recvmsg on TCP sockets—not remote packet delivery. Network traffic can trigger RX allocations only after a local bind with a malformed dmabuf.\nAC:L - The attacker fully controls dmabuf size/SG layout at bind time and the virtual offset passed via sendmsg iovec bases, allowing reliable out-of-bounds indexing without races or victim-dependent timing.\nPR:L - TX bind intentionally lacks admin-perm; RX bind requires CAP_NET_ADMIN, which is obtainable in user namespaces via unshare. No real-root privileges are needed, only a local authorized user on a devmem-capable system.\nUI:N - No victim interaction is required; the attacker triggers the bug through their own netlink bind and socket operations.\nS:C - Corrupted net_iov metadata can program incorrect DMA addresses for NIC DMA operations, potentially impacting device memory outside the kernel's security authority—a DMA boundary crossing inherent to the devmem subsystem.\nC:H - Out-of-bounds read of tx_vec leaks adjacent kernel heap contents (kernel pointers), and heap corruption from misindexed niovs arrays can be leveraged for arbitrary memory disclosure.\nI:H - Out-of-bounds writes to the niovs array corrupt adjacent kernel heap objects, and use of attacker-influenced pointers in skb fragment setup enables memory corruption exploitable for control-flow hijacking.\nA:H - Dereferencing corrupted net_iov pointers or corrupting heap metadata via out-of-bounds access can cause kernel oops, panic, or hang during TX sendmsg or RX packet processing."
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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/devmem.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": "134c517dfa63203287b2aad6558017f42435a02e",
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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": "d5008e4e4ee6b739256b796702a7d1aae1b5c3b4",
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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": "4eb82ba543421e9e38cc14e4e82058b78850df50",
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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/devmem.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": "6.18.35",
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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": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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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",
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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": "6.18.35"
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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": "7.0.11"
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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"
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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/134c517dfa63203287b2aad6558017f42435a02e"
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},
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{
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"url": "https://git.kernel.org/stable/c/d5008e4e4ee6b739256b796702a7d1aae1b5c3b4"
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},
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{
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"url": "https://git.kernel.org/stable/c/4eb82ba543421e9e38cc14e4e82058b78850df50"
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}
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],
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"title": "net: devmem: reject dma-buf bind with non-page-aligned size or SG length",
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"x_generator": {
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} |