Bug 2529722

Summary: [Exploits (KEV)] CVE-2026-46333 kernel: Read root-owned files as an unprivileged user [fedora-all]
Product: [Fedora] Fedora Reporter: Jitendra Ahuja <jiahuja>
Component: kernelAssignee: Justin M. Forbes <jforbes>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: acaringi, adscvr, airlied, hans, hpa, jforbes, jwboyer, kernel-maint, linville, masami256, mchehab, nickolasjcarr, ptalbert, steved, suraj.ghimire7
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["7d8e6fc1-9fbd-4f0e-886c-d7d96e286dbe"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2477802    

Description Jitendra Ahuja 2026-09-08 08:58:42 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Read root-owned files as an unprivileged user. Pre-31e62c2ebbfd kernels (everything in stable as of 2026-05-14).

The bug
__ptrace_may_access() skips the dumpable check when task->mm == NULL. do_exit() runs exit_mm() before exit_files() — no mm, fds still there. pidfd_getfd(2) succeeds in that window when the caller's uid matches the target's.

Reported by Qualys, fixed by Linus 2026-05-14. Jann Horn flagged the FD-theft shape in October 2020. Six years.

Reproducers, if any, will remain confidential and never be made public, unless done so by the security team.