364 lines
19 KiB
JSON
364 lines
19 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-2026-74582",
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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": "2026-08-15T05:44:03.918Z",
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"datePublished": "2026-08-21T16:31:55.283Z",
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"dateUpdated": "2026-10-16T19:05:58.230Z"
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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": "2026-08-27T12:39:47.499Z"
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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\npacket: use consistent hard_header_len in non-ring send paths\n\npacket_snd() reads dev->hard_header_len multiple times while allocating\nand constructing an skb. Device reconfiguration can change this value\nconcurrently, for example through bonding device type changes.\n\nFor SOCK_RAW, packet_snd() can save a larger value in reserve and later\nallocate headroom using a smaller value. Moving skb->data back by reserve\nthen places it before skb->head, and the following copy from userspace can\nattempt an out-of-bounds write.\n\npacket_sendmsg_spkt() has the same issue because it calculates its\nreservation and header offset from separate reads before dropping the RCU\nread lock to allocate the skb.\n\nAdd LL_RESERVED_SPACE_EX() for callers that already saved a header length.\nRead hard_header_len once in packet_snd() and use it for allocation and\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value\nthrough the device lookup retry.\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops->create is not addressed here."
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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 flaw is in packet_snd() and packet_sendmsg_spkt() on the local AF_PACKET sendmsg() transmit path; it is not triggered by processing remotely received network traffic or pre-authentication network services.\nAC:L - An attacker in a user+network namespace can open an AF_PACKET SOCK_RAW socket and concurrently reconfigure the bound netdev (bonding/VLAN/macvlan/team) to change hard_header_len, controlling both sides of the race without external timing.\nPR:L - Exploitation requires CAP_NET_RAW to create AF_PACKET sockets and CAP_NET_ADMIN to change netdev hard_header_len; both are obtainable by an unprivileged user inside a user namespace without init-namespace root.\nUI:N - No victim interaction is required; the attacker triggers the bug using their own packet socket sendmsg calls and concurrent netdev reconfiguration threads.\nS:U - Impact is kernel heap corruption and local privilege escalation within the same kernel security domain; it does not constitute a VM escape, sandbox breakout, or IOMMU boundary bypass.\nC:H - Racing hard_header_len can place skb->data before skb->head, and skb_copy_datagram_from_iter/memcpy_from_msg then writes attacker-controlled data outside the skb buffer, corrupting adjacent slab objects and enabling kernel memory disclosure.\nI:H - Inconsistent hard_header_len between skb allocation and header adjustment causes out-of-bounds kernel heap writes of attacker-controlled packet data, yielding corruption primitives suitable for control-flow hijacking and local privilege escalation.\nA:H - Out-of-bounds skb buffer writes corrupt kmalloc metadata and can trigger kernel oops/panic, causing reliable denial of service even when full exploitation is not completed."
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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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"include/linux/netdevice.h",
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"net/packet/af_packet.c"
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],
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"versions": [
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{
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"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
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"lessThan": "bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812",
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"status": "affected",
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"versionType": "git"
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},
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"lessThan": "78a47127e33c340bc6d38dcc4552a094b4f5cc77",
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"status": "affected",
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},
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{
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"lessThan": "142e287b3a25cfe909215177c23243e7fc5ae2b1",
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"status": "affected",
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},
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{
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"lessThan": "91f041451f967cd87ed722a8f43c0b767a64f1a0",
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"status": "affected",
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},
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{
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"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
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"lessThan": "9052756290962ffb9a661bcf319e92dedaaedfed",
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"status": "affected",
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"lessThan": "5bb10753d428aadfc356a2bfe9acea09c82a62ec",
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"status": "affected",
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{
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"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
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"status": "affected",
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},
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{
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"version": "b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba",
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"lessThan": "03390aa32e669cc4ecd7d34108e2e1afc13d689d",
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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": "d9fb8cc230b2a4757e9fe4f81468f81212d4deaa",
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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": "6190cce26e40bf71c4d375b21eea74bb07b6a0f3",
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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": "01a658c1b9d4b5393c38d5a92d9112ab1425382a",
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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": "8809ae6747e760e6f1d2453ceb08c9bcc4939766",
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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": "4.4.133",
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"lessThan": "4.5",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.9.103",
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"lessThan": "4.10",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.14.44",
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"lessThan": "4.15",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.16.12",
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"lessThan": "4.17",
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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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"include/linux/netdevice.h",
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"net/packet/af_packet.c"
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],
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"versions": [
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{
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"status": "affected"
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{
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"version": "0",
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"lessThan": "4.17",
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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": "5.10.267",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.218",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.185",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.152",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.104",
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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": "6.18.45",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/bcd4df60ac9481b1ceffdfe5ec38fe51dcaae812"
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},
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{
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"url": "https://git.kernel.org/stable/c/78a47127e33c340bc6d38dcc4552a094b4f5cc77"
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},
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{
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"url": "https://git.kernel.org/stable/c/142e287b3a25cfe909215177c23243e7fc5ae2b1"
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},
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{
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"url": "https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0"
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},
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{
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"url": "https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed"
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},
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{
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"url": "https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec"
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},
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{
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"url": "https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd"
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},
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{
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"url": "https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d"
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}
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],
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"title": "packet: use consistent hard_header_len in non-ring send paths",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74582",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:01:14.406882Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:05:58.230Z"
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}
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}
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]
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}
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} |