206 lines
10 KiB
JSON
206 lines
10 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-2026-90076",
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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": "2026-09-11T19:38:34.785Z",
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"datePublished": "2026-09-17T16:05:55.517Z",
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"dateUpdated": "2026-10-30T12:34:01.376Z"
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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": "2026-10-30T12:34:01.376Z"
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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\nnet/sched: fq: add overflow bounds to quantum and initial quantum\n\nfq_init() computes quantum = 2 * psched_mtu() and initial_quantum = 10 *\npsched_mtu() with no overflow check. A device with a huge MTU (e.g. dummy\nwith max_mtu == 0 accepting MTU 2147483634) makes psched_mtu() return\n0x80000000; the 2 * and 10 * multiplications wrap to 0 in 32-bit\narithmetic, so q->quantum == 0. Then in fq_dequeue() the credit-refill\nloop adds 0 to f->credit (which stays <= 0) and goto begin loops\nforever under the qdisc lock, creating a soft lockup.\n\nClamp psched_mtu() to [1, 1 << 20] before multiplying so the product\ncannot wrap, then cap the result at 1 << 20, matching the bound already\nenforced on TCA_FQ_QUANTUM in fq_change().\n\nConditions to recreate the bug: a device whose MTU (plus\nhard_header_len) is large enough that 2 * psched_mtu() wraps (e.g. a\ndummy device with max_mtu == 0 accepting MTU 2147483634). Requires\nCAP_NET_ADMIN in a user namespace."
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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/sched/sch_fq.c"
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],
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"versions": [
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{
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"version": "afe4fd062416b158a8a8538b23adc1930a9b88dc",
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"lessThan": "cf398f67d9caa71af3b9fb9319058b22fe6b524e",
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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": "afe4fd062416b158a8a8538b23adc1930a9b88dc",
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"lessThan": "fd63409b669f9951f1cc6b02486a5254103800d1",
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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": "afe4fd062416b158a8a8538b23adc1930a9b88dc",
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"lessThan": "d16dac3925be95ad46e986d4b139c9898b6e227f",
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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": "afe4fd062416b158a8a8538b23adc1930a9b88dc",
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"lessThan": "f6b3e3848a5fca63438984acd6d9eceac80814c1",
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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": "afe4fd062416b158a8a8538b23adc1930a9b88dc",
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"lessThan": "e35acd56f244d94355f9ab237c2ecc8fba5e6f04",
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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": "afe4fd062416b158a8a8538b23adc1930a9b88dc",
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"lessThan": "709f34f7c28dc4dd6c40343d101850f11e172312",
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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/sched/sch_fq.c"
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],
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"versions": [
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{
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"version": "3.12",
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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": "3.12",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.110",
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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": "6.18.52",
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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": "7.2.6",
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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": "3.12",
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"versionEndExcluding": "6.1.191"
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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": "3.12",
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"versionEndExcluding": "6.6.160"
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"versionStartIncluding": "3.12",
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"versionStartIncluding": "3.12",
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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/cf398f67d9caa71af3b9fb9319058b22fe6b524e"
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},
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{
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"url": "https://git.kernel.org/stable/c/fd63409b669f9951f1cc6b02486a5254103800d1"
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},
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{
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"url": "https://git.kernel.org/stable/c/d16dac3925be95ad46e986d4b139c9898b6e227f"
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},
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{
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"url": "https://git.kernel.org/stable/c/f6b3e3848a5fca63438984acd6d9eceac80814c1"
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},
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{
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"url": "https://git.kernel.org/stable/c/e35acd56f244d94355f9ab237c2ecc8fba5e6f04"
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},
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{
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"url": "https://git.kernel.org/stable/c/709f34f7c28dc4dd6c40343d101850f11e172312"
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}
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],
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"title": "net/sched: fq: add overflow bounds to quantum and initial quantum",
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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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} |