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Noroxi
NVD / CVE Program· CNA Linux

CVE-2021-47360: binder: make sure fd closes complete

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 4.21, 5fdb55c1ac9585eb23bb2541d5819224429e103d, aa2c274c279ff365a06a4cba263f04965895166e.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 4.21, 5fdb55c1ac9585eb23bb2541d5819224429e103d, aa2c274c279ff365a06a4cba263f04965895166e 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: binder: make sure fd closes complete During BC_FREE_BUFFER processing, the BINDER_TYPE_FDA object cleanup may close 1 or more fds. The close operations are completed using the task work mechanism -- which means the thread needs to return to userspace or the file object may never be dereferenced -- which can lead to hung processes. Force the binder thread back to userspace if an fd is closed during BC_FREE_BUFFER handling.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 21, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 16th 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.

Follow CVE-2021-47360

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 kernel5.0 and later · before 5.4.150
  • linux linux kernel5.5 and later · before 5.10.70
  • linux linux kernel5.11 and later · before 5.14.9
  • linux linux kernel4.20.1
  • linux linux kernel5.15

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

    • 27564d8d5d12d2ff197055346069c6bdbe08a8c2, 5.0affected
    • 80cd795630d6526ba729a089a435bf74a57af927 and later · before aa2c274c279ff365a06a4cba263f04965895166eaffected · git
    • 80cd795630d6526ba729a089a435bf74a57af927 and later · before d5b0473707fa53b03a5db0256ce62b2874bddbc7affected · git
    • 80cd795630d6526ba729a089a435bf74a57af927 and later · before b95483d8d94b41fa31a84c1d86710b7907a37621affected · git
    • 80cd795630d6526ba729a089a435bf74a57af927 and later · before 5fdb55c1ac9585eb23bb2541d5819224429e103daffected · git
    • 4.20.1 and later · before 4.21affected · semver
    • before 5.0not affected · semver
    • 5.4.150 and later · up to and including 5.4.*not affected · semver
    • 5.10.70 and later · up to and including 5.10.*not affected · semver
    • 5.14.9 and later · up to and including 5.14.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.9-15.14.9-1
openSUSE:Leap 15.5dtb-aarch64before 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-64kbbefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-azurebefore 5.14.21-150500.33.57.15.14.21-150500.33.57.1
openSUSE:Leap 15.5kernel-debugbefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-defaultbefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-default-basebefore 5.14.21-150500.55.68.1.150500.6.31.15.14.21-150500.55.68.1.150500.6.31.1
openSUSE:Leap 15.5kernel-docsbefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-kvmsmallbefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-obs-buildbefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-obs-qabefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-rtbefore 5.14.21-150500.13.58.15.14.21-150500.13.58.1
openSUSE:Leap 15.5kernel-rt_debugbefore 5.14.21-150500.13.58.15.14.21-150500.13.58.1
openSUSE:Leap 15.5kernel-sourcebefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-source-azurebefore 5.14.21-150500.33.57.15.14.21-150500.33.57.1
openSUSE:Leap 15.5kernel-source-rtbefore 5.14.21-150500.13.58.15.14.21-150500.13.58.1
openSUSE:Leap 15.5kernel-symsbefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap 15.5kernel-syms-azurebefore 5.14.21-150500.33.57.15.14.21-150500.33.57.1
openSUSE:Leap 15.5kernel-syms-rtbefore 5.14.21-150500.13.58.15.14.21-150500.13.58.1
openSUSE:Leap 15.5kernel-zfcpdumpbefore 5.14.21-150500.55.68.15.14.21-150500.55.68.1
openSUSE:Leap Micro 5.3kernel-defaultbefore 5.14.21-150400.24.122.25.14.21-150400.24.122.2
openSUSE:Leap Micro 5.3kernel-default-basebefore 5.14.21-150400.24.122.2.150400.24.58.25.14.21-150400.24.122.2.150400.24.58.2
openSUSE:Leap Micro 5.3kernel-rtbefore 5.14.21-150400.15.82.15.14.21-150400.15.82.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-64kbbefore 5.14.21-150400.24.122.25.14.21-150400.24.122.2

+27

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-2021-47358May 21, 2024 · staging: greybus: uart: fix tty use after free
    31Monitor
  • ← EarlierCVE-2021-47359May 21, 2024 · cifs: Fix soft lockup during fsstress
    22Monitor
  • Later →CVE-2021-47361May 21, 2024 · mcb: fix error handling in mcb_alloc_bus()
    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 Linux4.21Vendor (CNA)
Linux Linux5fdb55c1ac9585eb23bb2541d5819224429e103dVendor (CNA)
Linux Linuxaa2c274c279ff365a06a4cba263f04965895166eVendor (CNA)
Linux Linuxb95483d8d94b41fa31a84c1d86710b7907a37621Vendor (CNA)
Linux Linuxd5b0473707fa53b03a5db0256ce62b2874bddbc7Vendor (CNA)
debian:linux5.14.9-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch645.14.21-150500.55.68.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-64kb5.14.21-150500.55.68.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-azure5.14.21-150500.33.57.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-debug5.14.21-150500.55.68.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-default5.14.21-150400.24.122.2 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-default-base5.14.21-150400.24.122.2.150400.24.58.2 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-rt5.14.21-150500.13.58.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-rt_debug5.14.21-150500.13.58.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-source-azure5.14.21-150500.33.57.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-source-rt5.14.21-150500.13.58.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-syms-azure5.14.21-150500.33.57.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-syms-rt5.14.21-150500.13.58.1 · openSUSE:Leap 15.5Package registry (OSV)
suse:kernel-64kb5.14.21-150400.24.122.2 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-azure5.14.21-150500.33.57.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)
suse:kernel-default5.14.21-150400.24.122.2 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-default-base5.14.21-150400.24.122.2.150400.24.58.2 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-livepatch-SLE15-SP4_Update_271-150400.9.3.2 · SUSE:Linux Enterprise Live Patching 15 SP4Package registry (OSV)
suse:kernel-livepatch-SLE15-SP5-RT_Update_161-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5Package registry (OSV)
suse:kernel-rt5.14.21-150500.13.58.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-rt_debug5.14.21-150500.13.58.1 · SUSE:Real Time Module 15 SP5Package registry (OSV)
suse:kernel-source-azure5.14.21-150500.33.57.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)
suse:kernel-source-rt5.14.21-150500.13.58.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-syms-azure5.14.21-150500.33.57.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5Package registry (OSV)
suse:kernel-syms-rt5.14.21-150500.13.58.1 · SUSE:Real Time Module 15 SP5Package 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-2024-3949250 days apartmailbox: mtk-cmdq: Fix pm_runtime_get_sync() warning in mbox shutdown
    28Monitor
  • CVE-2023-527970 days apartdrivers: perf: Check find_first_bit() return value
    22Monitor
  • CVE-2023-526804 days apartALSA: scarlett2: Add missing error checks to *_ctl_get()
    22Monitor
  • CVE-2023-526874 days apartcrypto: safexcel - Add error handling for dma_map_sg() calls
    22Monitor
  • CVE-2023-526924 days apartALSA: scarlett2: Add missing error check to scarlett2_usb_set_config()
    22Monitor
  • CVE-2024-4206769 days apartbpf: Take return from set_memory_rox() into account with bpf_jit_binary_lock_ro()
    22Monitor

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-252 · Unchecked Return Value

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 (3 more)

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

All records