{"cve":{"cve_id":"CVE-2026-52980","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"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.","published_at":"2026-06-24T16:28:56.457000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/c71bf35caba12bfd9bc23e32b0bcd9e02d1cf1ac","https://git.kernel.org/stable/c/f3c16e1f4a314a20717ab90a41885f8111a242ab","https://git.kernel.org/stable/c/8f4a16200785f49cf02c5b71bdfe7a9dab63f23a","https://git.kernel.org/stable/c/3da56dc063cd77b9c0b40add930767fab4e389f3"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:22.518073Z","updated_at":"2026-06-28T23:30:49.890169Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"82e9d0456e06cebe2c89f3c73cdbc9e3805e9437","version_start_inclusive":true,"version_end":"c71bf35caba12bfd9bc23e32b0bcd9e02d1cf1ac","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:82e9d0456e06cebe2c89f3c73cdbc9e3805e9437:c71bf35caba12bfd9bc23e32b0bcd9e02d1cf1ac"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"82e9d0456e06cebe2c89f3c73cdbc9e3805e9437","version_start_inclusive":true,"version_end":"f3c16e1f4a314a20717ab90a41885f8111a242ab","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:82e9d0456e06cebe2c89f3c73cdbc9e3805e9437:f3c16e1f4a314a20717ab90a41885f8111a242ab"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"82e9d0456e06cebe2c89f3c73cdbc9e3805e9437","version_start_inclusive":true,"version_end":"8f4a16200785f49cf02c5b71bdfe7a9dab63f23a","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:82e9d0456e06cebe2c89f3c73cdbc9e3805e9437:8f4a16200785f49cf02c5b71bdfe7a9dab63f23a"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"82e9d0456e06cebe2c89f3c73cdbc9e3805e9437","version_start_inclusive":true,"version_end":"3da56dc063cd77b9c0b40add930767fab4e389f3","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:82e9d0456e06cebe2c89f3c73cdbc9e3805e9437:3da56dc063cd77b9c0b40add930767fab4e389f3"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12","version_start_inclusive":true,"version_end":"6.12","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12:6.12"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"6.12","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:6.12"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12.91","version_start_inclusive":true,"version_end":"6.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12.91:6.12.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.33","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.33:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0.10","version_start_inclusive":true,"version_end":"7.0.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0.10:7.0.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.1","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.1:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/c71bf35caba12bfd9bc23e32b0bcd9e02d1cf1ac","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/f3c16e1f4a314a20717ab90a41885f8111a242ab","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/8f4a16200785f49cf02c5b71bdfe7a9dab63f23a","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/3da56dc063cd77b9c0b40add930767fab4e389f3","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-24T16:28:56.457000Z","label":"CVE published","source":null}]}