375 lines
18 KiB
JSON
375 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-27414",
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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": "2024-02-25T13:47:42.682Z",
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"datePublished": "2024-05-17T11:50:57.207Z",
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"dateUpdated": "2026-08-05T11:29:43.204Z"
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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": "2026-08-05T11:29:43.204Z"
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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\nrtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back\n\nIn the commit d73ef2d69c0d (\"rtnetlink: let rtnl_bridge_setlink checks\nIFLA_BRIDGE_MODE length\"), an adjustment was made to the old loop logic\nin the function `rtnl_bridge_setlink` to enable the loop to also check\nthe length of the IFLA_BRIDGE_MODE attribute. However, this adjustment\nremoved the `break` statement and led to an error logic of the flags\nwriting back at the end of this function.\n\nif (have_flags)\n memcpy(nla_data(attr), &flags, sizeof(flags));\n // attr should point to IFLA_BRIDGE_FLAGS NLA !!!\n\nBefore the mentioned commit, the `attr` is granted to be IFLA_BRIDGE_FLAGS.\nHowever, this is not necessarily true fow now as the updated loop will let\nthe attr point to the last NLA, even an invalid NLA which could cause\noverflow writes.\n\nThis patch introduces a new variable `br_flag` to save the NLA pointer\nthat points to IFLA_BRIDGE_FLAGS and uses it to resolve the mentioned\nerror logic."
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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 vulnerability is reached via an RTM_SETLINK rtnetlink message over an AF_NETLINK socket, a local kernel interface with no remote or adjacent-network exposure.\nAC:L - The attacker fully controls the netlink message and its nested IFLA_AF_SPEC attributes, so crafting the layout that makes the final attr point out of bounds and triggering the memcpy write is fully reliable.\nPR:L - RTM_SETLINK requires CAP_NET_ADMIN checked against the net namespace's user_ns (netlink_net_capable), which an unprivileged user obtains via unshare -Urn.\nUI:N - The attacker triggers the flaw entirely by sending its own netlink message; no action by any other user is required.\nS:U - The out-of-bounds write corrupts kernel heap memory within the same kernel security authority; no VM/sandbox/IOMMU boundary is crossed.\nC:H - The out-of-bounds heap write is memory corruption adjacent to the netlink buffer that can be leveraged to corrupt neighboring structures (length/pointer fields) toward information disclosure.\nI:H - This is a controlled out-of-bounds heap write (memory corruption), which under kernel guidance maps to High integrity impact.\nA:H - An out-of-bounds write into kernel heap memory can corrupt adjacent objects and cause an oops/panic, giving High availability impact."
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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/rtnetlink.c"
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],
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{
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"version": "ad46d4861ed36315d3d9e838723ba3e367ecc042",
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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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"net/core/rtnetlink.c"
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],
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"status": "unaffected",
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}
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],
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"title": "rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back",
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