CVE-2022-49769: gfs2: Check sb_bsize_shift after reading superblock
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: 0.21% (FIRST EPSS).
- 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 15c83fa0fd659dd9fbdc940a560b61236e876a80, 16670534c7cff1acd918a6a5ec751b14e7436b76, 1ad197097343568066a8ffaa27ee7d0ae6d9f476.
Low priority for now. Upgrade to Linux Linux 15c83fa0fd659dd9fbdc940a560b61236e876a80, 16670534c7cff1acd918a6a5ec751b14e7436b76, 1ad197097343568066a8ffaa27ee7d0ae6d9f476 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: gfs2: Check sb_bsize_shift after reading superblock Fuzzers like to scribble over sb_bsize_shift but in reality it's very unlikely that this field would be corrupted on its own. Nevertheless it should be checked to avoid the possibility of messy mount errors due to bad calculations. It's always a fixed value based on the block size so we can just check that it's the expected value. Tested with: mkfs.gfs2 -O -p lock_nolock /dev/vdb for i in 0 -1 64 65 32 33; do gfs2_edit -p sb field sb_bsize_shift $i /dev/vdb mount /dev/vdb /mnt/test && umount /mnt/test done Before this patch we get a withdraw after [ 76.413681] gfs2: fsid=loop0.0: fatal: invalid metadata block [ 76.413681] bh = 19 (type: exp=5, found=4) [ 76.413681] function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 492 and with UBSAN configured we also get complaints like [ 76.373395] UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:295:19 [ 76.373815] shift exponent 4294967287 is too large for 64-bit type 'long unsigned int' After the patch, these complaints don't appear, mount fails immediately and we get an explanation in dmesg.
- Published
- May 1, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 12th percentile
- CWE
- —
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
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
If any of these changes, we'll tell you in the daily email digest.
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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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_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 4.9.334
- linux linux kernel4.10 and later · before 4.14.300
- linux linux kernel4.15 and later · before 4.19.267
- linux linux kernel4.20 and later · before 5.4.225
- linux linux kernel5.5 and later · before 5.10.156
- linux linux kernel5.11 and later · before 5.15.80
- linux linux kernel5.16 and later · before 6.0.10
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
- 2.6.19affected
- b3b94faa5fe5968827ba0640ee9fba4b3e7f736e and later · before d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87affected · git
- b3b94faa5fe5968827ba0640ee9fba4b3e7f736e and later · before 1ad197097343568066a8ffaa27ee7d0ae6d9f476affected · git
- b3b94faa5fe5968827ba0640ee9fba4b3e7f736e and later · before 15c83fa0fd659dd9fbdc940a560b61236e876a80affected · git
- b3b94faa5fe5968827ba0640ee9fba4b3e7f736e and later · before 8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2affected · git
- b3b94faa5fe5968827ba0640ee9fba4b3e7f736e and later · before 5fa30be7ba81191b0a0c7239a89befc0c94286d5affected · git
- b3b94faa5fe5968827ba0640ee9fba4b3e7f736e and later · before 28275a7c84d21c55ab3282d897f284d8d527173caffected · git
- b3b94faa5fe5968827ba0640ee9fba4b3e7f736e and later · before 16670534c7cff1acd918a6a5ec751b14e7436b76affected · git
- b3b94faa5fe5968827ba0640ee9fba4b3e7f736e and later · before 670f8ce56dd0632dc29a0322e188cc73ce3c6b92affected · git
- before 2.6.19not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.0.10-1 | 6.0.10-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-64kb | before 5.3.18-150300.59.207.1 | 5.3.18-150300.59.207.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-default-base | before 5.3.18-150300.59.207.1.150300.18.124.1 | 5.3.18-150300.59.207.1.150300.18.124.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-docs | before 5.3.18-150300.59.207.1 | 5.3.18-150300.59.207.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-obs-build | before 5.3.18-150300.59.207.1 | 5.3.18-150300.59.207.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-preempt | before 5.3.18-150300.59.207.1 | 5.3.18-150300.59.207.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-source | before 5.3.18-150300.59.207.1 | 5.3.18-150300.59.207.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-syms | before 5.3.18-150300.59.207.1 | 5.3.18-150300.59.207.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.167.1 | 5.14.21-150400.24.167.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.167.1 | 5.14.21-150400.24.167.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.167.1 | 5.14.21-150400.24.167.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-source | before 5.14.21-150400.24.167.1 | 5.14.21-150400.24.167.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.167.1 | 5.14.21-150400.24.167.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.110.1 | 5.14.21-150500.55.110.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.110.1 | 5.14.21-150500.55.110.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.110.1 | 5.14.21-150500.55.110.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.110.1 | 5.14.21-150500.55.110.1 |
| SUSE:Linux Enterprise Live Patching 15 SP3 | kernel-default | before 5.3.18-150300.59.207.1 | 5.3.18-150300.59.207.1 |
| SUSE:Linux Enterprise Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_58 | before 1-150300.7.3.1 | 1-150300.7.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_41 | before 1-150400.9.3.1 | 1-150400.9.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_27 | before 1-150500.11.7.1 | 1-150500.11.7.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.167.1 | 5.14.21-150400.24.167.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.167.1.150400.24.84.1 | 5.14.21-150400.24.167.1.150400.24.84.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-rt | before 5.14.21-150400.15.121.1 | 5.14.21-150400.15.121.1 |
+9
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- 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 KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2022-49767May 1, 2025 · 9p/trans_fd: always use O_NONBLOCK read/write22Monitor
- ← EarlierCVE-2022-49768May 1, 2025 · 9p: trans_fd/p9_conn_cancel: drop client lock earlier22Monitor
- Later →CVE-2022-49770May 1, 2025 · ceph: avoid putting the realm twice when decoding snaps fails31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 15c83fa0fd659dd9fbdc940a560b61236e876a80 | Vendor (CNA) |
| Linux Linux | 16670534c7cff1acd918a6a5ec751b14e7436b76 | Vendor (CNA) |
| Linux Linux | 1ad197097343568066a8ffaa27ee7d0ae6d9f476 | Vendor (CNA) |
| Linux Linux | 28275a7c84d21c55ab3282d897f284d8d527173c | Vendor (CNA) |
| Linux Linux | 5fa30be7ba81191b0a0c7239a89befc0c94286d5 | Vendor (CNA) |
| Linux Linux | 670f8ce56dd0632dc29a0322e188cc73ce3c6b92 | Vendor (CNA) |
| Linux Linux | 8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2 | Vendor (CNA) |
| Linux Linux | d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87 | Vendor (CNA) |
| debian:linux | 6.0.10-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 5.3.18-150300.59.207.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | Package registry (OSV) |
| suse:kernel-default | 5.3.18-150300.59.207.1 · SUSE:Linux Enterprise Live Patching 15 SP3 | Package registry (OSV) |
| suse:kernel-default-base | 5.3.18-150300.59.207.1.150300.18.124.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | Package registry (OSV) |
| suse:kernel-docs | 5.3.18-150300.59.207.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP3_Update_58 | 1-150300.7.3.1 · SUSE:Linux Enterprise Live Patching 15 SP3 | Package registry (OSV) |
| suse:kernel-obs-build | 5.3.18-150300.59.207.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | Package registry (OSV) |
| suse:kernel-preempt | 5.3.18-150300.59.207.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150400.15.121.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-source | 5.3.18-150300.59.207.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | Package registry (OSV) |
| suse:kernel-source-rt | 5.14.21-150400.15.121.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-syms | 5.3.18-150300.59.207.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.3.18-150300.59.207.1 · SUSE:Linux Enterprise Server 15 SP3-LTSS | Package 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.
No history yet (it accumulates with the daily EPSS job).
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 researchersFinders, 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.
No nightly-computed relations.
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)
—
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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- git.kernel.org/stable/c/16670534c7cff1acd918a6a5ec751b14e7436b76
- git.kernel.org/stable/c/1ad197097343568066a8ffaa27ee7d0ae6d9f476
- git.kernel.org/stable/c/28275a7c84d21c55ab3282d897f284d8d527173c
- git.kernel.org/stable/c/5fa30be7ba81191b0a0c7239a89befc0c94286d5
- git.kernel.org/stable/c/670f8ce56dd0632dc29a0322e188cc73ce3c6b92
- git.kernel.org/stable/c/8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2
- git.kernel.org/stable/c/d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87
Vendor advisories and official records. Exploit/PoC links are deliberately left out.