CVE-2024-49573

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Further ensure no new ->next buddy\never starts as delayed."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The defect is in the CFS scheduler core (kernel/sched/fair.c), reached by ordinary task wakeup, sleep and load-balancer migration on the local machine. There is no remote or adjacent-network input involved, so an attacker must be able to run code on the system.\nAC:H - The entire bug is gated on the NEXT_BUDDY scheduler feature, which is `SCHED_FEAT(NEXT_BUDDY, false)` \u2014 disabled by default and settable only by root writing /sys/kernel/debug/sched/features on a CONFIG_SCHED_DEBUG=y kernel (sched_feat_write is the sole caller of sched_feat_set; there is no cmdline or sysctl path). An unprivileged attacker cannot create this precondition, and enabling NEXT_BUDDY is rare in practice, so success depends on system state outside the attacker's control.\nPR:L - Given a system with NEXT_BUDDY enabled, no special capability is needed \u2014 any unprivileged task's ordinary sleep/wake and the kernel's own load balancer (attach_task()/move_queued_task() calling wakeup_preempt() on a still-sched_delayed task) drive the code path. Only the ability to run an unprivileged process is required.\nUI:N - No victim action is needed; the reporter observed the WARN triggering instantly on ordinary system activity once the feature was enabled. Normal scheduling and CPU load balancing reach the faulty path on their own.\nS:U - The corrupted state is the kernel's own per-CPU cfs_rq bookkeeping and sched_entity flags, all within the kernel's security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The scheduler is left able to run an entity that is simultaneously marked sched_delayed and blocked, which desynchronizes on_rq/nr_running/load.weight and can drive __dequeue_entity() to rb_erase an already-unlinked node, writing through a stale rb_parent pointer into memory that may have been reused. Such scheduler-structure corruption is leverageable toward reading kernel memory contents.\nI:H - A task in a non-RUNNING state is made to execute \u2014 a direct violation of a core scheduling invariant \u2014 and the resulting sched_delayed/on_rq desync leads to double account_entity_dequeue() (nr_running and load.weight underflow) and rb_erase on an unlinked rbtree node, giving a write primitive over scheduler-adjacent memory rather than a mere miscount.\nA:H - pick_next_entity() fires WARN_ONCE, which is a full kernel panic on the panic_on_warn=1 configurations used by hardened and CI deployments, and further SCHED_WARN_ONs cascade in dequeue_entity()/dequeue_entities(). Beyond the splat, the runqueue accounting underflow and rbtree corruption destabilize scheduling on the affected CPU, causing starvation, hangs, and crashes."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/fair.c"], "versions": [{"version": "152e11f6df293e816a6a37c69757033cdc72667d", "lessThan": "5dbe6816c49197677a5ecce749bd99929da147da", "status": "affected", "versionType": "git"}, {"version": "152e11f6df293e816a6a37c69757033cdc72667d", "lessThan": "493afbd187c4c9cc1642792c0d9ba400c3d6d90d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/fair.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.7", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5dbe6816c49197677a5ecce749bd99929da147da"}, {"url": "https://git.kernel.org/stable/c/493afbd187c4c9cc1642792c0d9ba400c3d6d90d"}], "title": "sched/fair: Fix NEXT_BUDDY", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/sched/fair.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5dbe6816c49197677a5ecce749bd99929da147da", "status": "affected", "version": "152e11f6df293e816a6a37c69757033cdc72667d", "versionType": "git"}, {"lessThan": "493afbd187c4c9cc1642792c0d9ba400c3d6d90d", "status": "affected", "version": "152e11f6df293e816a6a37c69757033cdc72667d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/sched/fair.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BB2B083D-CB9D-4D06-9284-5BCF6F66A34C", "versionEndExcluding": "6.12.7", "versionStartIncluding": "6.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix NEXT_BUDDY\n\nAdam reports that enabling NEXT_BUDDY insta triggers a WARN in\npick_next_entity().\n\nMoving clear_buddies() up before the delayed dequeue bits ensures\nno ->next buddy becomes delayed. Further ensure no new ->next buddy\never starts as delayed."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched/fair: Fix NEXT_BUDDY Adam informa que habilitar NEXT_BUDDY instant\u00e1neamente activa una ADVERTENCIA en pick_next_entity(). Mover clear_buddies() hacia arriba antes de los bits de eliminaci\u00f3n de cola retrasados garantiza que ning\u00fan ->next buddy se retrase. Adem\u00e1s, aseg\u00farese de que ning\u00fan nuevo ->next buddy comience con retraso."}], "id": "CVE-2024-49573", "lastModified": "2026-08-04T11:20:50.790", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-01-11T13:15:24.223", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/493afbd187c4c9cc1642792c0d9ba400c3d6d90d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5dbe6816c49197677a5ecce749bd99929da147da"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: sched/fair: Fix NEXT_BUDDY", "id": "2337095", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2337095"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsched/fair: Fix NEXT_BUDDY\nAdam reports that enabling NEXT_BUDDY insta triggers a WARN in\npick_next_entity().\nMoving clear_buddies() up before the delayed dequeue bits ensures\nno ->next buddy becomes delayed. Further ensure no new ->next buddy\never starts as delayed."], "name": "CVE-2024-49573", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-01-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-49573\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49573\nhttps://lore.kernel.org/linux-cve-announce/2025011142-CVE-2024-49573-fa46@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T22:00:55.167422+00:00", "updated": "2025-07-12T22:00:55.167521+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}