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Vulnerability details: VCID-tz5h-hd3e-rbbv
Vulnerability ID VCID-tz5h-hd3e-rbbv
Aliases CVE-2026-31597
Summary In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY filemap_fault() may drop the mmap_lock before returning VM_FAULT_RETRY, as documented in mm/filemap.c: "If our return value has VM_FAULT_RETRY set, it's because the mmap_lock may be dropped before doing I/O or by lock_folio_maybe_drop_mmap()." When this happens, a concurrent munmap() can call remove_vma() and free the vm_area_struct via RCU. The saved 'vma' pointer in ocfs2_fault() then becomes a dangling pointer, and the subsequent trace_ocfs2_fault() call dereferences it -- a use-after-free. Fix this by saving ip_blkno as a plain integer before calling filemap_fault(), and removing vma from the trace event. Since ip_blkno is copied by value before the lock can be dropped, it remains valid regardless of what happens to the vma or inode afterward.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-364 Signal Handler Race Condition
System Score Found at
epss 0.00012 https://api.first.org/data/v1/epss?cve=CVE-2026-31597
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2026-31597
cvssv3.1 7.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31597.json
https://api.first.org/data/v1/epss?cve=CVE-2026-31597
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-31597
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2461484 https://bugzilla.redhat.com/show_bug.cgi?id=2461484
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.018
EPSS Score 0.00012
Published At April 29, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-25T23:21:32.156381+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.4.0