191 lines
9.4 KiB
JSON
191 lines
9.4 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-2026-98084",
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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": "2026-09-25T10:19:56.075Z",
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"datePublished": "2026-09-25T10:24:19.881Z",
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"dateUpdated": "2026-10-21T12:54:25.939Z"
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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": "2026-10-21T12:54:25.939Z"
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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: backtracking shouldn't clear outer frame R1-R5 for callbacks\n\nWhen processing calls to bpf_loop() verifier marks R1 (and R4) as\nprecise. R1 tracks loop iterations number and because of the\n'callback_depth < R1' mechanics in check_helper_call() must be marked\nprecise. However, precision propagation for R1 was broken,\nwhen bpf_loop() call was verified on a second iteration.\n\nConsider the following verification trace:\n- main: bpf_loop(nr_loops, callback ...)\n- callback: BPF_EXIT\n- main: bpf_loop(nr_loops, callback ...)\n- ...\n\nWhile the first visit of the call to bpf_loop() propagated R1\nprecision as expected, the second call to mark_chain_precision() in\nthe check_helper_call() set R1, but it was immediately reset when\nbacktrack_insn() processed preceding BPF_EXIT in the loop deleted in\nthis patch.\n\nBecause of that, the second visit of the call to bpf_loop() injected\ncheckpoint with R1 not marked as precise. Which could trick the\nverifier into accepting unsafe programs. See the next patch for an\nexample of such program.\n\nCommit is structured in a way to minimize conflicts when\n'bpf' would be eventually merged with 'bpf-next'."
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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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"kernel/bpf/backtrack.c"
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],
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"versions": [
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{
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"version": "b43550d7d58e7ae6618aaab18c1e912fa4d6e3dd",
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"lessThan": "1ac58dab0a83d2c64e3b807a3a0b399f17a74110",
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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": "ab5cfac139ab8576fb54630d4cca23c3e690ee90",
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"lessThan": "cdc93c6370f792d0649df2a145ac0cdcd430e411",
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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": "ab5cfac139ab8576fb54630d4cca23c3e690ee90",
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"lessThan": "3a39bc9707fbd1bef4df7318a9d02222741dda5b",
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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": "ab5cfac139ab8576fb54630d4cca23c3e690ee90",
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"lessThan": "f83890dfed9efc5e19df1dbc1ad707a142936923",
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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": "ab5cfac139ab8576fb54630d4cca23c3e690ee90",
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"lessThan": "e3e4f66cc4b72333d0886ae2673c360248987889",
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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": "6.6.15",
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"lessThan": "6.6.160",
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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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"kernel/bpf/backtrack.c"
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],
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"versions": [
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{
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"version": "6.7",
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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": "6.7",
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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": "6.18.57",
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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": "7.2.7",
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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": "6.6.15",
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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": "6.7",
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"versionEndExcluding": "6.12.114"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.7",
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"versionStartIncluding": "6.7",
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"versionEndExcluding": "7.2.7"
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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": "6.7",
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"versionEndExcluding": "7.3"
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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/1ac58dab0a83d2c64e3b807a3a0b399f17a74110"
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},
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{
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"url": "https://git.kernel.org/stable/c/cdc93c6370f792d0649df2a145ac0cdcd430e411"
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},
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{
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"url": "https://git.kernel.org/stable/c/3a39bc9707fbd1bef4df7318a9d02222741dda5b"
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},
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{
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"url": "https://git.kernel.org/stable/c/f83890dfed9efc5e19df1dbc1ad707a142936923"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3e4f66cc4b72333d0886ae2673c360248987889"
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}
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],
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"title": "bpf: backtracking shouldn't clear outer frame R1-R5 for callbacks",
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"x_generator": {
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}
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}
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} |