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NVD / CVE Program· CNA Linux

CVE-2021-47340: jfs: fix GPF in diFree

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: 0.25% (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 3bb27e27240289b47d3466f647a55c567adbdc3a, 42f102ea1943ecb10a0756bf75424de5d1d5beed, 49def1b0644892e3b113673c13d650c3060b43bc.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3bb27e27240289b47d3466f647a55c567adbdc3a, 42f102ea1943ecb10a0756bf75424de5d1d5beed, 49def1b0644892e3b113673c13d650c3060b43bc 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: jfs: fix GPF in diFree Avoid passing inode with JFS_SBI(inode->i_sb)->ipimap == NULL to diFree()[1]. GFP will appear: struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap; struct inomap *imap = JFS_IP(ipimap)->i_imap; JFS_IP() will return invalid pointer when ipimap == NULL Call Trace: diFree+0x13d/0x2dc0 fs/jfs/jfs_imap.c:853 [1] jfs_evict_inode+0x2c9/0x370 fs/jfs/inode.c:154 evict+0x2ed/0x750 fs/inode.c:578 iput_final fs/inode.c:1654 [inline] iput.part.0+0x3fe/0x820 fs/inode.c:1680 iput+0x58/0x70 fs/inode.c:1670

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 21, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 17th 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 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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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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 4.4.276
  • linux linux kernel4.5 and later · before 4.9.276
  • linux linux kernel4.10 and later · before 4.14.240
  • linux linux kernel4.15 and later · before 4.19.198
  • linux linux kernel4.20 and later · before 5.4.133
  • linux linux kernel5.5 and later · before 5.10.51
  • linux linux kernel5.11 and later · before 5.12.18
  • linux linux kernel5.13 and later · before 5.13.3

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

    • 2.6.36affected
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before 7bde24bde490f3139eee147efc6d60d6040fe975affected · git
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before 745c9a59422c63f661f4374ed5181740db4130a1affected · git
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before 49def1b0644892e3b113673c13d650c3060b43bcaffected · git
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before aff8d95b69051d0cf4acc3d91f22299fdbb9dfb3affected · git
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before a21e5cb1a64c904f1f0ef7b2d386fc7d2b1d2ce2affected · git
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before 8018936950360f1c503bb385e158cfc5e4945d18affected · git
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before 3bb27e27240289b47d3466f647a55c567adbdc3aaffected · git
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before 42f102ea1943ecb10a0756bf75424de5d1d5beedaffected · git
    • 62aff86fdf18657d9eca7878654415f94f16d027 and later · before 9d574f985fe33efd6911f4d752de6f485a1ea732affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.6-15.14.6-1

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-2021-47338May 21, 2024 · fbmem: Do not delete the mode that is still in use
    31Monitor
  • ← EarlierCVE-2021-47339May 21, 2024 · media: v4l2-core: explicitly clear ioctl input data
    22Monitor
  • Later →CVE-2021-47341May 21, 2024 · KVM: mmio: Fix use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio
    31Monitor

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 Linux3bb27e27240289b47d3466f647a55c567adbdc3aVendor (CNA)
Linux Linux42f102ea1943ecb10a0756bf75424de5d1d5beedVendor (CNA)
Linux Linux49def1b0644892e3b113673c13d650c3060b43bcVendor (CNA)
Linux Linux745c9a59422c63f661f4374ed5181740db4130a1Vendor (CNA)
Linux Linux7bde24bde490f3139eee147efc6d60d6040fe975Vendor (CNA)
Linux Linux8018936950360f1c503bb385e158cfc5e4945d18Vendor (CNA)
Linux Linux9d574f985fe33efd6911f4d752de6f485a1ea732Vendor (CNA)
Linux Linuxa21e5cb1a64c904f1f0ef7b2d386fc7d2b1d2ce2Vendor (CNA)
Linux Linuxaff8d95b69051d0cf4acc3d91f22299fdbb9dfb3Vendor (CNA)
debian:linux5.14.6-1 · 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.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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-476 · NULL Pointer Dereference

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

  1. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records