{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-39886", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.145Z", "datePublished": "2025-09-23T06:00:53.120Z", "dateUpdated": "2026-05-11T21:38:19.683Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:38:19.683Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()\n\nCurrently, calling bpf_map_kmalloc_node() from __bpf_async_init() can\ncause various locking issues; see the following stack trace (edited for\nstyle) as one example:\n\n...\n [10.011566] do_raw_spin_lock.cold\n [10.011570] try_to_wake_up (5) double-acquiring the same\n [10.011575] kick_pool rq_lock, causing a hardlockup\n [10.011579] __queue_work\n [10.011582] queue_work_on\n [10.011585] kernfs_notify\n [10.011589] cgroup_file_notify\n [10.011593] try_charge_memcg (4) memcg accounting raises an\n [10.011597] obj_cgroup_charge_pages MEMCG_MAX event\n [10.011599] obj_cgroup_charge_account\n [10.011600] __memcg_slab_post_alloc_hook\n [10.011603] __kmalloc_node_noprof\n...\n [10.011611] bpf_map_kmalloc_node\n [10.011612] __bpf_async_init\n [10.011615] bpf_timer_init (3) BPF calls bpf_timer_init()\n [10.011617] bpf_prog_xxxxxxxxxxxxxxxx_fcg_runnable\n [10.011619] bpf__sched_ext_ops_runnable\n [10.011620] enqueue_task_scx (2) BPF runs with rq_lock held\n [10.011622] enqueue_task\n [10.011626] ttwu_do_activate\n [10.011629] sched_ttwu_pending (1) grabs rq_lock\n...\n\nThe above was reproduced on bpf-next (b338cf849ec8) by modifying\n./tools/sched_ext/scx_flatcg.bpf.c to call bpf_timer_init() during\nops.runnable(), and hacking the memcg accounting code a bit to make\na bpf_timer_init() call more likely to raise an MEMCG_MAX event.\n\nWe have also run into other similar variants (both internally and on\nbpf-next), including double-acquiring cgroup_file_kn_lock, the same\nworker_pool::lock, etc.\n\nAs suggested by Shakeel, fix this by using __GFP_HIGH instead of\nGFP_ATOMIC in __bpf_async_init(), so that e.g. if try_charge_memcg()\nraises an MEMCG_MAX event, we call __memcg_memory_event() with\n@allow_spinning=false and avoid calling cgroup_file_notify() there.\n\nDepends on mm patch\n\"memcg: skip cgroup_file_notify if spinning is not allowed\":\nhttps://lore.kernel.org/bpf/20250905201606.66198-1-shakeel.butt@linux.dev/\n\nv0 approach s/bpf_map_kmalloc_node/bpf_mem_alloc/\nhttps://lore.kernel.org/bpf/20250905061919.439648-1-yepeilin@google.com/\nv1 approach:\nhttps://lore.kernel.org/bpf/20250905234547.862249-1-yepeilin@google.com/" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/helpers.c" ], "versions": [ { "version": "b00628b1c7d595ae5b544e059c27b1f5828314b4", "lessThan": "449682e76f32601f211816d3e2100bed87e67a4c", "status": "affected", "versionType": "git" }, { "version": "b00628b1c7d595ae5b544e059c27b1f5828314b4", "lessThan": "cd1fd26bb13473c1734e3026b2b97025a0a4087b", "status": "affected", "versionType": "git" }, { "version": "b00628b1c7d595ae5b544e059c27b1f5828314b4", "lessThan": "ac70cd446f83ccb25532b343919ab86eacdcd06a", "status": "affected", "versionType": "git" }, { "version": "b00628b1c7d595ae5b544e059c27b1f5828314b4", "lessThan": "6d78b4473cdb08b74662355a9e8510bde09c511e", "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/bpf/helpers.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.107", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.48", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16.8", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17", "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": "5.15", "versionEndExcluding": "6.6.107" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.48" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.16.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.17" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/449682e76f32601f211816d3e2100bed87e67a4c" }, { "url": "https://git.kernel.org/stable/c/cd1fd26bb13473c1734e3026b2b97025a0a4087b" }, { "url": "https://git.kernel.org/stable/c/ac70cd446f83ccb25532b343919ab86eacdcd06a" }, { "url": "https://git.kernel.org/stable/c/6d78b4473cdb08b74662355a9e8510bde09c511e" } ], "title": "bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2025-39886", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T19:26:19.815693Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:33:12.924Z" } } ] } }