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CVE-2022-49075· NVD / CVE Program· CNA Linux

btrfs: fix qgroup reserve overflow the qgroup limit

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.67% (FIRST EPSS); higher than 51.1% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0355387ea5b02d353c9415613fab908fac5c52a6, 44277c50fdba5019ca25bfad1b71e2561b0de11b, 4b98799e181b4326a613108cf37acc1f55d21b45.
  • Severity is disputed: the assigning authority (CNA) scores it 8.1, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 0355387ea5b02d353c9415613fab908fac5c52a6, 44277c50fdba5019ca25bfad1b71e2561b0de11b, 4b98799e181b4326a613108cf37acc1f55d21b45 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix qgroup reserve overflow the qgroup limit We use extent_changeset->bytes_changed in qgroup_reserve_data() to record how many bytes we set for EXTENT_QGROUP_RESERVED state. Currently the bytes_changed is set as "unsigned int", and it will overflow if we try to fallocate a range larger than 4GiB. The result is we reserve less bytes and eventually break the qgroup limit. Unlike regular buffered/direct write, which we use one changeset for each ordered extent, which can never be larger than 256M. For fallocate, we use one changeset for the whole range, thus it no longer respects the 256M per extent limit, and caused the problem. The following example test script reproduces the problem: $ cat qgroup-overflow.sh #!/bin/bash DEV=/dev/sdj MNT=/mnt/sdj mkfs.btrfs -f $DEV mount $DEV $MNT # Set qgroup limit to 2GiB. btrfs quota enable $MNT btrfs qgroup limit 2G $MNT # Try to fallocate a 3GiB file. This should fail. echo echo "Try to fallocate a 3GiB file..." fallocate -l 3G $MNT/3G.file # Try to fallocate a 5GiB file. echo echo "Try to fallocate a 5GiB file..." fallocate -l 5G $MNT/5G.file # See we break the qgroup limit. echo sync btrfs qgroup show -r $MNT umount $MNT When running the test: $ ./qgroup-overflow.sh (...) Try to fallocate a 3GiB file... fallocate: fallocate failed: Disk quota exceeded Try to fallocate a 5GiB file... qgroupid         rfer         excl     max_rfer --------         ----         ----     -------- 0/5           5.00GiB      5.00GiB      2.00GiB Since we have no control of how bytes_changed is used, it's better to set it to u64.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Aug 5, 2026
EPSS
0.6% · 51th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CNA vs NVD score

NVD
5.5
CNA · Linux
8.1
2.6 point gap

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 4.14.276
  • linux linux kernel4.15 and later · before 4.19.238
  • linux linux kernel4.20 and later · before 5.4.189
  • linux linux kernel5.5 and later · before 5.10.111
  • linux linux kernel5.11 and later · before 5.15.34
  • linux linux kernel5.16 and later · before 5.16.20
  • linux linux kernel5.17 and later · before 5.17.3
  • linux linux kernel5.18

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.13affected
    • 7bc329c1836866ffac8b2613f780a51b3ffe786d and later · before 0355387ea5b02d353c9415613fab908fac5c52a6affected · git
    • 7bc329c1836866ffac8b2613f780a51b3ffe786d and later · before f3d97b22a708bf9e3f3ac2ba232bcefd0b0c136baffected · git
    • 7bc329c1836866ffac8b2613f780a51b3ffe786d and later · before 44277c50fdba5019ca25bfad1b71e2561b0de11baffected · git
    • 7bc329c1836866ffac8b2613f780a51b3ffe786d and later · before 82ae73ac963cee877ce34f7c31b2b456b516e96caffected · git
    • 7bc329c1836866ffac8b2613f780a51b3ffe786d and later · before 4b98799e181b4326a613108cf37acc1f55d21b45affected · git
    • 7bc329c1836866ffac8b2613f780a51b3ffe786d and later · before 6bfff81286d4491f02dad7814bae5c77c9ad2320affected · git
    • 7bc329c1836866ffac8b2613f780a51b3ffe786d and later · before 7941b74ed49b6db25efbef2256ebef843c11a010affected · git
    • 7bc329c1836866ffac8b2613f780a51b3ffe786d and later · before b642b52d0b50f4d398cb4293f64992d0eed2e2ceaffected · git
    • before 4.13not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.17.3-15.17.3-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
    77This week
  • CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV
    77This week
  • CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV
    77This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0355387ea5b02d353c9415613fab908fac5c52a6Vendor (CNA)
Linux Linux44277c50fdba5019ca25bfad1b71e2561b0de11bVendor (CNA)
Linux Linux4b98799e181b4326a613108cf37acc1f55d21b45Vendor (CNA)
Linux Linux6bfff81286d4491f02dad7814bae5c77c9ad2320Vendor (CNA)
Linux Linux7941b74ed49b6db25efbef2256ebef843c11a010Vendor (CNA)
Linux Linux82ae73ac963cee877ce34f7c31b2b456b516e96cVendor (CNA)
Linux Linuxb642b52d0b50f4d398cb4293f64992d0eed2e2ceVendor (CNA)
Linux Linuxf3d97b22a708bf9e3f3ac2ba232bcefd0b0c136bVendor (CNA)
debian:linux5.17.3-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-31633422 days apartrxrpc: Fix integer overflow in rxgk_verify_response()
    39Monitor
  • CVE-2026-31649422 days apartnet: stmmac: fix integer underflow in chain mode
    39Monitor
  • CVE-2026-46039455 days apartrxgk: Fix potential integer overflow in length check
    39Monitor
  • CVE-2026-46198456 days apartbatman-adv: fix integer overflow on buff_pos
    35Monitor
  • CVE-2026-64313514 days apartcrypto: ecc - Fix carry overflow in vli multiplication
    35Monitor
  • CVE-2022-49030128 days apartlibbpf: Handle size overflow for ringbuf mmap
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records