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NVD / CVE Program· CNA Linux

CVE-2024-26883: bpf: Fix stackmap overflow check on 32-bit arches

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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 0971126c8164abe2004b8536b49690a0d6005b0a, 15641007df0f0d35fa28742b25c2a7db9dcd6895, 21e5fa4688e1a4d3db6b72216231b24232f75c1d.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0971126c8164abe2004b8536b49690a0d6005b0a, 15641007df0f0d35fa28742b25c2a7db9dcd6895, 21e5fa4688e1a4d3db6b72216231b24232f75c1d 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: Fix stackmap overflow check on 32-bit arches The stackmap code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. The commit in the fixes tag actually attempted to fix this, but the fix did not account for the UB, so the fix only works on CPUs where an overflow does result in a neat truncation to zero, which is not guaranteed. Checking the value before rounding does not have this problem.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Apr 17, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 16th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 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.

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2024-26883

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
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 linux10.0
  • linux linux kernel4.9.258 and later · before 4.10
  • linux linux kernel4.14.222 and later · before 4.15
  • linux linux kernel4.19.177 and later · before 4.19.311
  • linux linux kernel5.4.99 and later · before 5.4.273
  • linux linux kernel5.10.17 and later · before 5.10.214
  • linux linux kernel5.11 and later · before 5.15.153
  • linux linux kernel5.16 and later · before 6.1.83
  • linux linux kernel6.2 and later · before 6.6.23
  • linux linux kernel6.7 and later · before 6.7.11
  • linux linux kernel6.8 and later · before 6.8.2

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

    • 253150830a012adfccf90afcebae8fda5b05a80f, 766107351731ae223ebf60ca22bdfeb47ce6acc8, 5.11affected
    • 063c722dd9d285d877e6fd499e753d6224f4c046 and later · before d0e214acc59145ce25113f617311aa79dda39cb3affected · git
    • 7e3a6b820535eb395784060ae26c5af579528fa0 and later · before 21e5fa4688e1a4d3db6b72216231b24232f75c1daffected · git
    • 8032bf2af9ce26b3a362b9711d15f626ab946a74 and later · before 15641007df0f0d35fa28742b25c2a7db9dcd6895affected · git
    • 6183f4d3a0a2ad230511987c6c362ca43ec0055f and later · before ca1f06e72dec41ae4f76e7b1a8a97265447b46aeaffected · git
    • 6183f4d3a0a2ad230511987c6c362ca43ec0055f and later · before f06899582ccee09bd85d0696290e3eaca9aa042daffected · git
    • 6183f4d3a0a2ad230511987c6c362ca43ec0055f and later · before 7070b274c7866a4c5036f8d54fcaf315c64ac33aaffected · git
    • 6183f4d3a0a2ad230511987c6c362ca43ec0055f and later · before 43f798b9036491fb014b55dd61c4c5c3193267d0affected · git
    • 6183f4d3a0a2ad230511987c6c362ca43ec0055f and later · before 0971126c8164abe2004b8536b49690a0d6005b0aaffected · git
    • 6183f4d3a0a2ad230511987c6c362ca43ec0055f and later · before 7a4b21250bf79eef26543d35bd390448646c536baffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.85-16.1.85-1
Debian:13linuxbefore 6.7.12-16.7.12-1

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-2024-26880Apr 17, 2024 · dm: call the resume method on internal suspend
    22Monitor
  • ← EarlierCVE-2024-26882Apr 17, 2024 · net: ip_tunnel: make sure to pull inner header in ip_tunnel_rcv()
    31Monitor
  • Later →CVE-2024-26884Apr 17, 2024 · bpf: Fix hashtab overflow check on 32-bit arches
    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 Linux0971126c8164abe2004b8536b49690a0d6005b0aVendor (CNA)
Linux Linux15641007df0f0d35fa28742b25c2a7db9dcd6895Vendor (CNA)
Linux Linux21e5fa4688e1a4d3db6b72216231b24232f75c1dVendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.19.311Vendor (CNA)
Linux Linux43f798b9036491fb014b55dd61c4c5c3193267d0Vendor (CNA)
Linux Linux5.10.214Vendor (CNA)
Linux Linux5.4.273Vendor (CNA)
Linux Linux7070b274c7866a4c5036f8d54fcaf315c64ac33aVendor (CNA)
Linux Linux7a4b21250bf79eef26543d35bd390448646c536bVendor (CNA)
Linux Linuxca1f06e72dec41ae4f76e7b1a8a97265447b46aeVendor (CNA)
Linux Linuxd0e214acc59145ce25113f617311aa79dda39cb3Vendor (CNA)
Linux Linuxf06899582ccee09bd85d0696290e3eaca9aa042dVendor (CNA)
debian:linux6.1.85-1 · 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-2023-5244056 days apartksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()
    38Monitor
  • CVE-2021-4734834 days apartdrm/amd/display: Avoid HDCP over-read and corruption
    36Monitor
  • CVE-2023-5243457 days apartsmb: client: fix potential OOBs in smb2_parse_contexts()
    32Monitor
  • CVE-2024-268840 days apartbpf: Fix hashtab overflow check on 32-bit arches
    31Monitor
  • CVE-2024-268850 days apartbpf: Fix DEVMAP_HASH overflow check on 32-bit arches
    31Monitor
  • CVE-2022-4865511 days apartfirmware: arm_scmi: Harden accesses to the reset domains
    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.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · 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
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (11 more)

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

All records