164 lines
9.1 KiB
JSON
164 lines
9.1 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-2026-52980",
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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": "2026-06-09T07:44:35.376Z",
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"datePublished": "2026-06-24T16:28:56.457Z",
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"dateUpdated": "2026-06-24T16:28:56.457Z"
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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": "2026-06-24T16:28:56.457Z"
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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\nsched/fair: Clear rel_deadline when initializing forked entities\n\nA yield-triggered crash can happen when a newly forked sched_entity\nenters the fair class with se->rel_deadline unexpectedly set.\n\nThe failing sequence is:\n\n 1. A task is forked while se->rel_deadline is still set.\n 2. __sched_fork() initializes vruntime, vlag and other sched_entity\n state, but does not clear rel_deadline.\n 3. On the first enqueue, enqueue_entity() calls place_entity().\n 4. Because se->rel_deadline is set, place_entity() treats se->deadline\n as a relative deadline and converts it to an absolute deadline by\n adding the current vruntime.\n 5. However, the forked entity's deadline is not a valid inherited\n relative deadline for this new scheduling instance, so the conversion\n produces an abnormally large deadline.\n 6. If the task later calls sched_yield(), yield_task_fair() advances\n se->vruntime to se->deadline.\n 7. The inflated vruntime is then used by the following enqueue path,\n where the vruntime-derived key can overflow when multiplied by the\n entity weight.\n 8. This corrupts cfs_rq->sum_w_vruntime, breaks EEVDF eligibility\n calculation, and can eventually make all entities appear ineligible.\n pick_next_entity() may then return NULL unexpectedly, leading to a\n later NULL dereference.\n\nA captured trace shows the effect clearly. Before yield, the entity's\nvruntime was around:\n\n 9834017729983308\n\nAfter yield_task_fair() executed:\n\n se->vruntime = se->deadline\n\nthe vruntime jumped to:\n\n 19668035460670230\n\nand the deadline was later advanced further to:\n\n 19668035463470230\n\nThis shows that the deadline had already become abnormally large before\nyield_task_fair() copied it into vruntime.\n\nrel_deadline is only meaningful when se->deadline really carries a\nrelative deadline that still needs to be placed against vruntime. A\nfreshly forked sched_entity should not inherit or retain this state.\nClear se->rel_deadline in __sched_fork(), together with the other\nsched_entity runtime state, so that the first enqueue does not interpret\nthe new entity's deadline as a stale relative deadline."
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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/sched/core.c"
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],
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"versions": [
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{
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"version": "82e9d0456e06cebe2c89f3c73cdbc9e3805e9437",
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"lessThan": "c71bf35caba12bfd9bc23e32b0bcd9e02d1cf1ac",
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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": "82e9d0456e06cebe2c89f3c73cdbc9e3805e9437",
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"lessThan": "f3c16e1f4a314a20717ab90a41885f8111a242ab",
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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": "82e9d0456e06cebe2c89f3c73cdbc9e3805e9437",
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"lessThan": "8f4a16200785f49cf02c5b71bdfe7a9dab63f23a",
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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": "82e9d0456e06cebe2c89f3c73cdbc9e3805e9437",
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"lessThan": "3da56dc063cd77b9c0b40add930767fab4e389f3",
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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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"kernel/sched/core.c"
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],
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"versions": [
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{
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"version": "6.12",
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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": "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": "6.12.91",
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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": "6.18.33",
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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": "7.0.10",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "6.12",
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"versionEndExcluding": "6.12.91"
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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": "6.12",
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"versionEndExcluding": "6.18.33"
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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": "6.12",
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"versionEndExcluding": "7.0.10"
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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": "6.12",
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"versionEndExcluding": "7.1"
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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/c71bf35caba12bfd9bc23e32b0bcd9e02d1cf1ac"
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},
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{
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"url": "https://git.kernel.org/stable/c/f3c16e1f4a314a20717ab90a41885f8111a242ab"
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},
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{
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"url": "https://git.kernel.org/stable/c/8f4a16200785f49cf02c5b71bdfe7a9dab63f23a"
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},
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{
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"url": "https://git.kernel.org/stable/c/3da56dc063cd77b9c0b40add930767fab4e389f3"
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}
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],
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"title": "sched/fair: Clear rel_deadline when initializing forked entities",
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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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} |