264 lines
14 KiB
JSON
264 lines
14 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-2026-98383",
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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": "2026-09-25T10:25:14.345Z",
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"datePublished": "2026-10-09T07:34:22.408Z",
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"dateUpdated": "2026-10-24T14:08:40.964Z"
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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": "2026-10-24T14:08:40.964Z"
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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: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL\n\nAn LWT_SEG6LOCAL program can invalidate its cached SRH with\nbpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter\nmay reallocate skb->head, leaving the per-CPU SRH pointer dangling.\nPost-program SRH validation then writes through that pointer.\n\nDisallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier\nrejects this unsafe helper combination. Other LWT program types continue\nto expose the helper through lwt_out_func_proto()."
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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 local bpf(BPF_PROG_LOAD) path reaches check_helper_call() and the patched lwt_seg6local_func_proto(), where attacker-authored bytecode requests bpf_lwt_seg6_adjust_srh() and bpf_skb_pull_data(); an RTM_NEWROUTE then attaches it. A received SRH packet merely executes that installed program and cannot create the unsafe helper sequence.\nAC:L - The attacker controls the helper order, SRH offset and length, and can inject a large non-linear SRv6 frame so bpf_skb_pull_data() deterministically reaches __pskb_pull_tail() and pskb_expand_head(). No race is required, and repeated packets reproduce the stale-pointer write.\nPR:L - bpf_prog_load() requires CAP_BPF and CAP_NET_ADMIN for BPF_PROG_TYPE_LWT_SEG6LOCAL, but BPF_F_TOKEN_FD and bpf_token_capable() support delegating both into a user namespace; rtnetlink_rcv_msg() separately accepts CAP_NET_ADMIN in the route's network namespace. Thus a host-unprivileged token holder can perform the complete setup.\nUI:N - The attacker loads the program, installs the End.BPF route, and injects the triggering SRv6 frame without any victim action.\nS:U - The stale srh pointer and resulting corruption occur in the same host kernel that processes the attacker's BPF program and packet; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - After skb->head is freed, seg6_bpf_has_valid_srh() passes the dangling srh pointer to seg6_validate_srh(), which reads header fields and variable-length TLVs from reusable slab memory; its drop-versus-forward result also provides an observable contents oracle.\nI:H - seg6_bpf_has_valid_srh() executes srh->hdrlen = srh_state->hdrlen >> 3 through the dangling pointer, producing an attacker-valued one-byte write into freed slab memory that can corrupt a reclaimed object or allocator state and support control-flow compromise.\nA:H - The stale write in seg6_bpf_has_valid_srh() is a confirmed slab use-after-free and can trigger a KASAN panic or later kernel oops through corrupted freed-object state; the attacker can repeat it with additional packets."
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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/filter.c"
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],
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"versions": [
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{
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"version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "0f38472a2aa8704a6b514c0dfa9c32f3672b8f32",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "cae8674489f26edf7553fdd660599466cbb4c32f",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "9f9e57b5a3a033f95f49ef9d541340cdbcb80abb",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "df0072be6fc373cb22f9ea854d458b04e32a03cf",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "b9bb0e735460751b620156f800a4279a28573392",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "37b18688cd18fd86d2f35c212df1611862a26cd5",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "fca71ead7a20290af1e2046983eeafae43d21af1",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "e4a62833adff6ef0fe7c0b90393204fe3c26b5c5",
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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/filter.c"
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],
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"versions": [
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{
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"version": "4.18",
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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": "4.18",
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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": "5.10.271",
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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": "5.15.222",
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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": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.158",
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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": "6.12.112",
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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": "6.18.55",
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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": "7.2.9",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "4.18",
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"versionEndExcluding": "5.10.271"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.18",
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"versionEndExcluding": "6.12.112"
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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/0f38472a2aa8704a6b514c0dfa9c32f3672b8f32"
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},
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{
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"url": "https://git.kernel.org/stable/c/cae8674489f26edf7553fdd660599466cbb4c32f"
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},
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{
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"url": "https://git.kernel.org/stable/c/9f9e57b5a3a033f95f49ef9d541340cdbcb80abb"
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},
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{
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"url": "https://git.kernel.org/stable/c/df0072be6fc373cb22f9ea854d458b04e32a03cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/b9bb0e735460751b620156f800a4279a28573392"
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},
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{
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"url": "https://git.kernel.org/stable/c/37b18688cd18fd86d2f35c212df1611862a26cd5"
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},
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{
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"url": "https://git.kernel.org/stable/c/fca71ead7a20290af1e2046983eeafae43d21af1"
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},
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{
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"url": "https://git.kernel.org/stable/c/e4a62833adff6ef0fe7c0b90393204fe3c26b5c5"
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}
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],
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"title": "bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL",
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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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}
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} |