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NVD / CVE Program· CNA Linux

CVE-2025-37858: fs/jfs: Prevent integer overflow in AG size calculation

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: 0.31% (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 211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a, 3d8a45f87010a802aa214bf39702ca9d99cbf3ba, 55edbf5dbf60a8195c21e92124c4028939ae16b2; Azure Linux 3.0 ARM 6.6.92.2-1; Azure Linux 3.0 x64 6.6.92.2-1.

Low priority for now. Upgrade to Linux Linux 211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a, 3d8a45f87010a802aa214bf39702ca9d99cbf3ba, 55edbf5dbf60a8195c21e92124c4028939ae16b2; Azure Linux 3.0 ARM 6.6.92.2-1; Azure Linux 3.0 x64 6.6.92.2-1 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: fs/jfs: Prevent integer overflow in AG size calculation The JFS filesystem calculates allocation group (AG) size using 1 << l2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB aggregates on 32-bit systems), this 32-bit shift operation causes undefined behavior and improper AG sizing. On 32-bit architectures: - Left-shifting 1 by 32+ bits results in 0 due to integer overflow - This creates invalid AG sizes (0 or garbage values) in sbi->bmap->db_agsize - Subsequent block allocations would reference invalid AG structures - Could lead to: - Filesystem corruption during extend operations - Kernel crashes due to invalid memory accesses - Security vulnerabilities via malformed on-disk structures Fix by casting to s64 before shifting: bmp->db_agsize = (s64)1 << l2agsize; This ensures 64-bit arithmetic even on 32-bit architectures. The cast matches the data type of db_agsize (s64) and follows similar patterns in JFS block calculation code. Found by Linux Verification Center (linuxtesting.org) with SVACE.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 9, 2025
Updated
Jun 17, 2026
EPSS
0.3% · 24th 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 · 0.3%

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.

Follow CVE-2025-37858

When you'll hear from us

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  • 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
debiandebian linux

Affected versions

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

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.237
  • linux linux kernel5.11 and later · before 5.15.181
  • linux linux kernel5.16 and later · before 6.1.135
  • linux linux kernelbefore 5.4.293
  • linux linux kernel6.7 and later · before 6.12.24
  • linux linux kernel6.13 and later · before 6.13.12
  • linux linux kernel6.14 and later · before 6.14.3
  • linux linux kernel6.2 and later · before 6.6.88

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before dd07a985e2ded47b6c7d69fc93c1fe02977c8454affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8bb29629a5e4090e1ef7199cb42db04a52802239affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 3d8a45f87010a802aa214bf39702ca9d99cbf3baaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 55edbf5dbf60a8195c21e92124c4028939ae16b2affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 7ccf3b35274512b60ecb614e0637e76bd6f2d829affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c802a6a4009f585111f903e810b3be9c6d0da329affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 211ed8f5e39e61f9e4d18edd64ce8005a67a1b2aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ec34cdf4f917cc6abd306cf091f8b8361fedac88affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 7fcbf789629cdb9fbf4e2172ce31136cfed11e5eaffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.135-16.1.135-1
Debian:13linuxbefore 6.12.25-16.12.25-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2025-37855May 9, 2025 · drm/amd/display: Guard Possible Null Pointer Dereference
    22Monitor
  • ← EarlierCVE-2025-37857May 9, 2025 · scsi: st: Fix array overflow in st_setup()
    22Monitor
  • Later →CVE-2025-37859May 9, 2025 · page_pool: avoid infinite loop to schedule delayed worker
    22Monitor

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 Linux211ed8f5e39e61f9e4d18edd64ce8005a67a1b2aVendor (CNA)
Linux Linux3d8a45f87010a802aa214bf39702ca9d99cbf3baVendor (CNA)
Linux Linux55edbf5dbf60a8195c21e92124c4028939ae16b2Vendor (CNA)
Linux Linux7ccf3b35274512b60ecb614e0637e76bd6f2d829Vendor (CNA)
Linux Linux7fcbf789629cdb9fbf4e2172ce31136cfed11e5eVendor (CNA)
Linux Linux8bb29629a5e4090e1ef7199cb42db04a52802239Vendor (CNA)
Linux Linuxc802a6a4009f585111f903e810b3be9c6d0da329Vendor (CNA)
Linux Linuxdd07a985e2ded47b6c7d69fc93c1fe02977c8454Vendor (CNA)
Linux Linuxec34cdf4f917cc6abd306cf091f8b8361fedac88Vendor (CNA)
Azure Linux 3.0 ARM6.6.92.2-1 · kernelMicrosoft (MSRC)
Azure Linux 3.0 x646.6.92.2-1 · kernelMicrosoft (MSRC)
debian:linux6.1.135-1 · 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.

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 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-2026-31633350 days apartrxrpc: Fix integer overflow in rxgk_verify_response()
    39Monitor
  • CVE-2026-31649350 days apartnet: stmmac: fix integer underflow in chain mode
    39Monitor
  • CVE-2026-31659350 days apartbatman-adv: reject oversized global TT response buffers
    39Monitor
  • CVE-2026-43341364 days apartnet/ipv6: ioam6: prevent schema length wraparound in trace fill
    39Monitor
  • CVE-2026-46039383 days apartrxgk: Fix potential integer overflow in length check
    39Monitor
  • CVE-2026-46325396 days apartRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
    39Monitor

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 (10 more)

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

All records