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CVE-2021-47482· NVD / CVE Program· CNA Linux

net: batman-adv: fix error handling

Noroxi assessment

Priority: Monitor (action score 21/100)

  • 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: 0.73% (FIRST EPSS); higher than 54% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20, 0c6b199f09be489c48622537a550787fc80aea73, 6422e8471890273994fe8cc6d452b0dcd2c9483e; cbl2 kernel 5.15.176.3-1 on CBL Mariner 2.0 5.15.176.3-1; cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0 5.15.179.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20, 0c6b199f09be489c48622537a550787fc80aea73, 6422e8471890273994fe8cc6d452b0dcd2c9483e; cbl2 kernel 5.15.176.3-1 on CBL Mariner 2.0 5.15.176.3-1; cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0 5.15.179.1-1 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: net: batman-adv: fix error handling Syzbot reported ODEBUG warning in batadv_nc_mesh_free(). The problem was in wrong error handling in batadv_mesh_init(). Before this patch batadv_mesh_init() was calling batadv_mesh_free() in case of any batadv_*_init() calls failure. This approach may work well, when there is some kind of indicator, which can tell which parts of batadv are initialized; but there isn't any. All written above lead to cleaning up uninitialized fields. Even if we hide ODEBUG warning by initializing bat_priv->nc.work, syzbot was able to hit GPF in batadv_nc_purge_paths(), because hash pointer in still NULL. [1] To fix these bugs we can unwind batadv_*_init() calls one by one. It is good approach for 2 reasons: 1) It fixes bugs on error handling path 2) It improves the performance, since we won't call unneeded batadv_*_free() functions. So, this patch makes all batadv_*_init() clean up all allocated memory before returning with an error to no call correspoing batadv_*_free() and open-codes batadv_mesh_free() with proper order to avoid touching uninitialized fields.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
May 22, 2024
Updated
Jun 17, 2026
EPSS
0.7% · 54th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

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-2021-47482

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 kernel2.6.38 and later · before 4.4.293
  • linux linux kernel4.5 and later · before 4.9.289
  • linux linux kernel4.10 and later · before 4.14.254
  • linux linux kernel4.15 and later · before 4.19.215
  • linux linux kernel4.20 and later · before 5.4.157
  • linux linux kernel5.5 and later · before 5.10.77
  • linux linux kernel5.11 and later · before 5.14.16
  • 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

    • 2.6.38affected
    • c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and later · before 0c6b199f09be489c48622537a550787fc80aea73affected · git
    • c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and later · before 07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20affected · git
    • c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and later · before e50f957652190b5a88a8ebce7e5ab14ebd0d3f00affected · git
    • c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and later · before fbf150b16a3635634b7dfb7f229d8fcd643c6c51affected · git
    • c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and later · before 6422e8471890273994fe8cc6d452b0dcd2c9483eaffected · git
    • c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and later · before b0a2cd38553c77928ef1646ed1518486b1e70ae8affected · git
    • c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and later · before a8f7359259dd5923adc6129284fdad12fc5db347affected · git
    • c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and later · before 6f68cd634856f8ca93bafd623ba5357e0f648c68affected · git
    • before 2.6.38not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.15.3-15.15.3-1

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

Published before and after this one in the same product

  • ← EarlierCVE-2021-47480May 22, 2024 · scsi: core: Put LLD module refcnt after SCSI device is released
    22Monitor
  • ← EarlierCVE-2021-47481May 22, 2024 · RDMA/mlx5: Initialize the ODP xarray when creating an ODP MR
    22Monitor
  • Later →CVE-2021-47483May 22, 2024 · regmap: Fix possible double-free in regcache_rbtree_exit()
    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 Linux07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20Vendor (CNA)
Linux Linux0c6b199f09be489c48622537a550787fc80aea73Vendor (CNA)
Linux Linux6422e8471890273994fe8cc6d452b0dcd2c9483eVendor (CNA)
Linux Linux6f68cd634856f8ca93bafd623ba5357e0f648c68Vendor (CNA)
Linux Linuxa8f7359259dd5923adc6129284fdad12fc5db347Vendor (CNA)
Linux Linuxb0a2cd38553c77928ef1646ed1518486b1e70ae8Vendor (CNA)
Linux Linuxe50f957652190b5a88a8ebce7e5ab14ebd0d3f00Vendor (CNA)
Linux Linuxfbf150b16a3635634b7dfb7f229d8fcd643c6c51Vendor (CNA)
cbl2 kernel 5.15.176.3-1 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.05.15.179.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux5.15.3-1 · 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.

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

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-544 · Missing Standardized Error Handling Mechanism

CVSS vector

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

nvd-secondary

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 (7 more)

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

All records