{"id":"CVE-2026-58825","kind":"vulnerability","aliases":["CVE-2026-58825"],"related":[],"title":"Linux kernel fork.c: use-after-free lets a local user gain higher privileges","description":"In multiple functions of fork.c, there is a possible use after free due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.","summary":"A logic error in several functions of the kernel's fork.c file can cause a use-after-free. A local user with no extra execution privileges can use it to escalate their privileges.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","kernel","linux","self-hosted"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-02T20:17:47+00:00","first_seen_at":"2026-11-02T20:35:30+00:00","triaged_at":"2026-11-02T20:39:11+00:00","updated_at":"2026-11-02T20:39:11+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-02T20:39:11Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Linux kernel fork.c: use-after-free lets a local user gain higher privileges","impact":"high","summary":"A logic error in several functions of the kernel's fork.c file can cause a use-after-free. A local user with no extra execution privileges can use it to escalate their privileges.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["linux","kernel","self-hosted"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains elevated privileges on the machine","analyst_note":"Check the NVD entry and the kernel.org stable commits for affected and fixed kernel versions.","how_to_check":"unknown","plain_action":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Affects systems running the kernel code in fork.c; the sources do not name affected kernel versions. Exposure requires a local account or code running on the machine. unknown for which systems are in scope.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000603,"input_tokens":4078,"output_tokens":391,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':16A,19A '-58825':17A,20A 'addit':91C 'caus':40B 'code':80C 'could':82C 'cve':15A,18A 'due':73C 'error':29B,77C 'escal':58B,86C 'execut':52B,92C 'exploit':101C 'extra':51B 'file':38B 'fork.c':3A,37B,65C 'free':7A,45B,72C 'function':32B,63C 'gain':12A 'higher':13A 'host':26B 'infrastructur':21B 'interact':96C 'kernel':2A,22B,35B 'lead':83C 'let':8A 'linux':1A,23B 'local':10A,47B,85C 'logic':28B,76C 'multipl':62C 'need':94C,99C 'possibl':69C 'privileg':14A,53B,60B,88C,93C 'self':25B 'self-host':24B 'sever':31B 'use':5A,43B,55B,70C 'use-after-fre':4A,42B 'user':11A,48B,95C","nicknames":[],"mitigations":[],"who_affected":"Affects systems running the kernel code in fork.c; the sources do not name affected kernel versions. Exposure requires a local account or code running on the machine. unknown for which systems are in scope.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","kernel","linux","selfhosted","unknown"],"first_public_at":"2026-11-02T20:17:47+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-58825","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58825","severity":null,"published_at":"2026-11-02T20:17:47+00:00","modified_at":"2026-11-02T20:17:47+00:00","first_seen_at":"2026-11-02T20:35:30+00:00","fetched_at":"2026-11-02T20:35:30+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}