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NVD / CVE Program· CNA Linux

CVE-2024-42161: bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD

Noroxi assessment

Priority: Monitor (action score 25/100)

  • 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: 0.22% (FIRST EPSS).
  • Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 009367099eb61a4fc2af44d4eb06b6b4de7de6db, 3364c2ed1c241989847f19cf83e3db903ce689e3, 7e5471b5efebc30dd0bc035cda86693a5c73d45f; azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 6.6.43.1-7; azl3 kernel 6.6.43.1-7 on Azure Linux 3.0 6.6.43.1-7.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 009367099eb61a4fc2af44d4eb06b6b4de7de6db, 3364c2ed1c241989847f19cf83e3db903ce689e3, 7e5471b5efebc30dd0bc035cda86693a5c73d45f; azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 6.6.43.1-7; azl3 kernel 6.6.43.1-7 on Azure Linux 3.0 6.6.43.1-7 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: bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD [Changes from V1: - Use a default branch in the switch statement to initialize `val'.] GCC warns that `val' may be used uninitialized in the BPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as: [...] unsigned long long val; \ [...] \ switch (__CORE_RELO(s, field, BYTE_SIZE)) { \ case 1: val = *(const unsigned char *)p; break; \ case 2: val = *(const unsigned short *)p; break; \ case 4: val = *(const unsigned int *)p; break; \ case 8: val = *(const unsigned long long *)p; break; \ } \ [...] val; \ } \ This patch adds a default entry in the switch statement that sets `val' to zero in order to avoid the warning, and random values to be used in case __builtin_preserve_field_info returns unexpected values for BPF_FIELD_BYTE_SIZE. Tested in bpf-next master. No regressions.

MediumCVSS 6.3 · v3.1—No exploit Fix available
Published
Jul 30, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 12th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.3 / 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

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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

Affected versions

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

  • linux linux kernelbefore 5.10.222
  • linux linux kernel5.11 and later · before 5.15.163
  • linux linux kernel5.16 and later · before 6.1.98
  • linux linux kernel6.2 and later · before 6.6.39
  • linux linux kernel6.7 and later · before 6.9.9

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

    • 5.5affected
    • ee26dade0e3bcd8a34ae7520e373fb69365fce7a and later · before b694989bb13ed5f166e633faa1eb0f21c6d261a6affected · git
    • ee26dade0e3bcd8a34ae7520e373fb69365fce7a and later · before 3364c2ed1c241989847f19cf83e3db903ce689e3affected · git
    • ee26dade0e3bcd8a34ae7520e373fb69365fce7a and later · before a21d76bd0b0d39518e9a4c19f6cf7c042a974affaffected · git
    • ee26dade0e3bcd8a34ae7520e373fb69365fce7a and later · before 7e5471b5efebc30dd0bc035cda86693a5c73d45faffected · git
    • ee26dade0e3bcd8a34ae7520e373fb69365fce7a and later · before ff941a8449e712eaf7efca1a13bfb9afd3d99fc2affected · git
    • ee26dade0e3bcd8a34ae7520e373fb69365fce7a and later · before 009367099eb61a4fc2af44d4eb06b6b4de7de6dbaffected · git
    • before 5.5not affected · semver
    • 5.10.222 and later · up to and including 5.10.*not affected · semver
    • 5.15.163 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.98-16.1.98-1
Debian:13linuxbefore 6.9.9-16.9.9-1

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-2024-42159Jul 30, 2024 · scsi: mpi3mr: Sanitise num_phys
    31Monitor
  • ← EarlierCVE-2024-42160Jul 30, 2024 · f2fs: check validation of fault attrs in f2fs_build_fault_attr()
    31Monitor
  • Later →CVE-2024-42223Jul 30, 2024 · media: dvb-frontends: tda10048: Fix integer overflow
    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 Linux009367099eb61a4fc2af44d4eb06b6b4de7de6dbVendor (CNA)
Linux Linux3364c2ed1c241989847f19cf83e3db903ce689e3Vendor (CNA)
Linux Linux7e5471b5efebc30dd0bc035cda86693a5c73d45fVendor (CNA)
Linux Linuxa21d76bd0b0d39518e9a4c19f6cf7c042a974affVendor (CNA)
Linux Linuxb694989bb13ed5f166e633faa1eb0f21c6d261a6Vendor (CNA)
Linux Linuxff941a8449e712eaf7efca1a13bfb9afd3d99fc2Vendor (CNA)
azl3 kernel 6.6.35.1-5 on Azure Linux 3.06.6.43.1-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.43.1-7 on Azure Linux 3.06.6.43.1-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.162.2-1 on CBL Mariner 2.05.15.164.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.162.2-1 on CBL-Mariner 2.05.15.163.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.163.1-1 on CBL Mariner 2.05.15.163.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.98-1 · 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-2024-50302112 days apartHID: core: zero-initialize the report bufferKEV
    52Plan
  • CVE-2024-4768583 days apartnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()
    36Monitor
  • CVE-2024-3689861 days apartgpiolib: cdev: fix uninitialised kfifo
    31Monitor
  • CVE-2021-4755367 days apartsched/scs: Reset task stack state in bringup_cpu()
    31Monitor
  • CVE-2024-2702290 days apartfork: defer linking file vma until vma is fully initialized
    31Monitor
  • CVE-2024-50143100 days apartudf: fix uninit-value use in udf_get_fileshortad
    31Monitor

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.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-908 · Use of Uninitialized Resource

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/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 (6 more)

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

All records