{"id":"CVE-2026-58942","kind":"vulnerability","aliases":["CVE-2026-58942"],"related":[],"title":"Linux kernel: memory fault handling flaw lets local users gain root","description":"In do_fault_around of memory.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 the kernel's do_fault_around routine in memory.c can cause a use-after-free. A local user with no extra privileges could use it to escalate to higher privileges.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","kernel","linux","self-hosted"],"not_affected_if":["no-local-users"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-02T20:17:51+00:00","first_seen_at":"2026-11-02T20:35:33+00:00","triaged_at":"2026-11-02T20:38:44+00:00","updated_at":"2026-11-02T20:38:44+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-02T20:38:44Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Linux kernel: memory fault handling flaw lets local users gain root","impact":"high","summary":"A logic error in the kernel's do_fault_around routine in memory.c can cause a use-after-free. A local user with no extra privileges could use it to escalate to higher privileges.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["linux","kernel","self-hosted"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local unprivileged user escalates to kernel-level privilege","analyst_note":"Check the kernel.org or distro advisories for affected and fixed kernel versions and the upstream commit for do_fault_around.","how_to_check":"unknown","plain_action":"","needs_analyst":true,"not_affected_if":["no-local-users"],"who_is_affected":"Affects systems running a Linux kernel where the flawed code path is present; the sources do not name affected kernel versions. Anyone with a local shell or code execution as an unprivileged user on such a machine is the realistic attacker. Systems with no untrusted local users carry lower risk.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000627,"input_tokens":4080,"output_tokens":438,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-58942':14A,17A 'addit':90C 'around':33B,62C 'caus':38B 'code':79C 'could':51B,81C 'cve':12A,15A 'due':72C 'error':26B,76C 'escal':55B,85C 'execut':91C 'exploit':100C 'extra':49B 'fault':4A,32B,61C 'flaw':6A 'free':43B,71C 'gain':10A 'handl':5A 'higher':57B 'host':23B 'infrastructur':18B 'interact':95C 'kernel':2A,19B,29B 'lead':82C 'let':7A 'linux':1A,20B 'local':8A,45B,84C 'logic':25B,75C 'memori':3A 'memory.c':36B,64C 'need':93C,98C 'possibl':68C 'privileg':50B,58B,87C,92C 'root':11A 'routin':34B 'self':22B 'self-host':21B 'use':41B,52B,69C 'use-after-fre':40B 'user':9A,46B,94C","nicknames":[],"mitigations":[],"who_affected":"Affects systems running a Linux kernel where the flawed code path is present; the sources do not name affected kernel versions. Anyone with a local shell or code execution as an unprivileged user on such a machine is the realistic attacker. Systems with no untrusted local users carry lower risk.","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":"2026-11-02T20:17:51+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-58942","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58942","severity":null,"published_at":"2026-11-02T20:17:51+00:00","modified_at":"2026-11-02T20:17:51+00:00","first_seen_at":"2026-11-02T20:35:33+00:00","fetched_at":"2026-11-02T20:35:33+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"}