205 lines
11 KiB
JSON
205 lines
11 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-2026-45932",
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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": "2026-05-13T15:03:33.086Z",
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"datePublished": "2026-05-27T12:17:50.353Z",
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"dateUpdated": "2026-10-21T12:40:59.729Z"
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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": "2026-10-21T12:40:59.729Z"
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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\nbpf: Fix tcx/netkit detach permissions when prog fd isn't given\n\nThis commit fixes a security issue where BPF_PROG_DETACH on tcx or\nnetkit devices could be executed by any user when no program fd was\nprovided, bypassing permission checks. The fix adds a capability\ncheck for CAP_NET_ADMIN or CAP_SYS_ADMIN in this case."
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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:L/I:H/A:H",
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"baseScore": 7.3,
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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 through the local bpf(2) syscall (BPF_PROG_DETACH command); there is no remote network entry point to this code.\nAC:L - An unprivileged user can reliably trigger the detach with a single deterministic syscall; there is no race, timing, or memory-layout dependency, and the only precondition (a tcx/netkit program already attached) is a standard deployment condition.\nPR:L - The entire bug is that no capability is required where CAP_NET_ADMIN/CAP_SYS_ADMIN should be; any basic local unprivileged user can call BPF_PROG_DETACH, which is not gated by unprivileged_bpf_disabled or any default check.\nUI:N - Detaching the program requires only the attacker's own syscall; no action by any other user or victim is needed.\nS:U - The impact stays within the kernel's own security authority (manipulating network BPF attachment state); no VM/IOMMU/sandbox boundary is crossed.\nC:L - Detaching does not read kernel memory directly, but removing a tcx/netkit filtering/isolation program (e.g., a Cilium network policy) can expose traffic or services that were previously confidential, a limited information exposure.\nI:H - An unprivileged user can make an unauthorized, CAP_NET_ADMIN-level modification to the device's network datapath, and by repeating the call can remove all attached programs, fully subverting the configured network security/policy enforcement.\nA:H - Removing the tcx/netkit datapath program disrupts packet processing for the affected device; in eBPF-datapath deployments this breaks forwarding/NAT/policy and causes loss of network connectivity for the node or its workloads."
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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/bpf.h",
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"include/linux/bpf_mprog.h",
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"kernel/bpf/syscall.c"
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],
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"versions": [
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{
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"version": "e420bed025071a623d2720a92bc2245c84757ecb",
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"lessThan": "8e1623e7d61faf16cbadc80550da874303611ff5",
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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": "e420bed025071a623d2720a92bc2245c84757ecb",
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"lessThan": "0c249f523175963b0a746bba673ecebdf6cefd86",
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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": "e420bed025071a623d2720a92bc2245c84757ecb",
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"lessThan": "4e0772cded109c238411f2fac36ac39302758b81",
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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": "e420bed025071a623d2720a92bc2245c84757ecb",
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"lessThan": "3f04cc1e5374da4c5e791ae010a06cfea7bacbe6",
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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": "e420bed025071a623d2720a92bc2245c84757ecb",
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"lessThan": "ae23bc81ddf7c17b663c4ed1b21e35527b0a7131",
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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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"include/linux/bpf.h",
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"include/linux/bpf_mprog.h",
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"kernel/bpf/syscall.c"
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],
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"versions": [
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{
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"version": "6.6",
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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": "6.6",
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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": "6.6.160",
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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": "6.12.114",
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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": "6.18.14",
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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": "6.19.4",
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"lessThanOrEqual": "6.19.*",
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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",
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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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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.6.160"
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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": "6.6",
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"versionEndExcluding": "6.12.114"
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"versionEndExcluding": "6.19.4"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "7.0"
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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/8e1623e7d61faf16cbadc80550da874303611ff5"
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},
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{
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"url": "https://git.kernel.org/stable/c/0c249f523175963b0a746bba673ecebdf6cefd86"
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},
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{
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"url": "https://git.kernel.org/stable/c/4e0772cded109c238411f2fac36ac39302758b81"
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},
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{
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"url": "https://git.kernel.org/stable/c/3f04cc1e5374da4c5e791ae010a06cfea7bacbe6"
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},
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{
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"url": "https://git.kernel.org/stable/c/ae23bc81ddf7c17b663c4ed1b21e35527b0a7131"
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}
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],
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"title": "bpf: Fix tcx/netkit detach permissions when prog fd isn't given",
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} |