CVE-2022-49913

MEDIUM EPSS 6.1%
Published May 1, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 1, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix inode list leak during backref walking at find_parent_nodes() During backref walking, at find_parent_nodes(), if we are dealing with a data extent and we get an error while resolving the indirect backrefs, at resolve_indirect_refs(), or in the while loop that iterates over the refs in the direct refs rbtree, we end up leaking the inode lists attached to the direct refs we have in the direct refs rbtree that were not yet added to the refs ulist passed as argument to find_parent_nodes(). Since they were not yet added to the refs ulist and prelim_release() does not free the lists, on error the caller can only free the lists attached to the refs that were added to the refs ulist, all the remaining refs get their inode lists never freed, therefore leaking their memory. Fix this by having prelim_release() always free any attached inode list to each ref found in the rbtree, and have find_parent_nodes() set the ref's inode list to NULL once it transfers ownership of the inode list to a ref added to the refs ulist passed to find_parent_nodes().

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
6.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥4.14  –  <5.4.224
linuxlinux_kernel*≥5.5  –  <5.10.154
linuxlinux_kernel*≥5.11  –  <5.15.78
linuxlinux_kernel*≥5.16  –  <6.0.8
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/222a3d533027b9492d5b7f5ecdc01a90f57bb5a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/61e06128113711df0534c404fb6bb528eb7d2332
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a6731a0df8c47ecc703bd7bb73459df767051e0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83ea8c5b54d452a5769e605e3c5c687e8ca06d89
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92876eec382a0f19f33d09d2c939e9ca49038ae5
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/222a3d533027b9492d5b7f5ecdc01a90f57bb5a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/61e06128113711df0534c404fb6bb528eb7d2332
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a6731a0df8c47ecc703bd7bb73459df767051e0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83ea8c5b54d452a5769e605e3c5c687e8ca06d89
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92876eec382a0f19f33d09d2c939e9ca49038ae5
    Patch