235 lines
12 KiB
JSON
235 lines
12 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-2022-50865",
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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": "2025-12-30T12:06:07.136Z",
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"datePublished": "2025-12-30T12:15:37.150Z",
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"dateUpdated": "2026-08-05T08:59:52.038Z"
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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": "2026-08-05T08:59:52.038Z"
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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\ntcp: fix a signed-integer-overflow bug in tcp_add_backlog()\n\nThe type of sk_rcvbuf and sk_sndbuf in struct sock is int, and\nin tcp_add_backlog(), the variable limit is caculated by adding\nsk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value\nof int and overflow. This patch reduces the limit budget by\nhalving the sndbuf to solve this issue since ACK packets are much\nsmaller than the payload."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - tcp_add_backlog() runs on the TCP receive path from tcp_v4_rcv/tcp_v6_rcv when processing inbound segments for an established socket owned by userspace, so a remote peer reaches it via ordinary network packets.\nAC:L - In a realistic high-throughput deployment with rmem_max/wmem_max raised near INT_MAX and the application setting large SO_RCVBUF/SO_SNDBUF, a peer can reliably drive the overflowed tiny backlog limit by sending data while the socket is locked; no attacker-uncontrollable race or rare config is required.\nPR:N - Triggering the buggy limit check needs only the ability to send TCP segments to an existing connection; no authentication or local privileges are required of the remote attacker.\nUI:N - Exploitation does not require any victim user action beyond the already-running TCP service accepting and processing network traffic.\nS:U - Impact stays within the host kernel networking authority; there is no VM escape, sandbox escape, or other cross-boundary scope change.\nC:N - The overflow only miscomputes the backlog admission limit; it does not corrupt memory or disclose kernel/user data.\nI:N - There is no write primitive, type confusion, or other integrity violation—only an incorrect (too-small) backlog threshold causing packet drops.\nA:H - When sk_rcvbuf and sk_sndbuf are both near INT_MAX, signed overflow collapses the u32 limit to ~64KB, so sk_add_backlog() prematurely drops inbound segments (TCPBACKLOGDROP), enabling denial of service on affected connections."
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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/ipv4/tcp_ipv4.c"
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],
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"versions": [
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{
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"version": "c9c3321257e1b95be9b375f811fb250162af8d39",
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"lessThan": "9d04b4d0feee12bce6bfe37f30d8e953d3c30368",
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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": "c9c3321257e1b95be9b375f811fb250162af8d39",
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"lessThan": "4f23cb2be530785db284a685d1b1c30224d8a538",
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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": "c9c3321257e1b95be9b375f811fb250162af8d39",
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"lessThan": "a85d39f14aa8a71e29cfb5eb5de02878a8779898",
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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": "c9c3321257e1b95be9b375f811fb250162af8d39",
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"lessThan": "28addf029417d53b1df062b4c87feb7bc033cb5f",
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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": "c9c3321257e1b95be9b375f811fb250162af8d39",
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"lessThan": "ec791d8149ff60c40ad2074af3b92a39c916a03f",
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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/ipv4/tcp_ipv4.c"
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],
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"versions": [
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{
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"version": "4.9",
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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": "4.9",
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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": "5.4.278",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.153",
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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": "5.15.77",
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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": "6.0.7",
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"lessThanOrEqual": "6.0.*",
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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": "6.1",
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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": "4.9",
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"versionEndExcluding": "5.4.278"
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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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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.9",
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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": "4.9",
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"versionEndExcluding": "6.0.7"
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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": "4.9",
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"versionEndExcluding": "6.1"
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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/9d04b4d0feee12bce6bfe37f30d8e953d3c30368"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f23cb2be530785db284a685d1b1c30224d8a538"
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},
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{
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"url": "https://git.kernel.org/stable/c/a85d39f14aa8a71e29cfb5eb5de02878a8779898"
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},
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{
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"url": "https://git.kernel.org/stable/c/28addf029417d53b1df062b4c87feb7bc033cb5f"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec791d8149ff60c40ad2074af3b92a39c916a03f"
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}
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],
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"title": "tcp: fix a signed-integer-overflow bug in tcp_add_backlog()",
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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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"timestamp": "2026-06-16T15:51:41.874254Z",
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"id": "CVE-2022-50865",
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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": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2026-06-16T15:51:51.892Z"
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}
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}
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]
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}
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} |