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NVD / CVE Program· CNA Linux

CVE-2023-54039: can: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 36befc9aed6202b4a9b906529aea13eacd7e34ff, 4c3fb22a6ec68258ee129a2e6b720f43dffc562f, 4fe1d9b6231a68ffc91318f57fd8e4982f028cf7.

Low priority for now. Upgrade to Linux Linux 36befc9aed6202b4a9b906529aea13eacd7e34ff, 4c3fb22a6ec68258ee129a2e6b720f43dffc562f, 4fe1d9b6231a68ffc91318f57fd8e4982f028cf7 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: can: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access In the j1939_tp_tx_dat_new() function, an out-of-bounds memory access could occur during the memcpy() operation if the size of skb->cb is larger than the size of struct j1939_sk_buff_cb. This is because the memcpy() operation uses the size of skb->cb, leading to a read beyond the struct j1939_sk_buff_cb. Updated the memcpy() operation to use the size of struct j1939_sk_buff_cb instead of the size of skb->cb. This ensures that the memcpy() operation only reads the memory within the bounds of struct j1939_sk_buff_cb, preventing out-of-bounds memory access. Additionally, add a BUILD_BUG_ON() to check that the size of skb->cb is greater than or equal to the size of struct j1939_sk_buff_cb. This ensures that the skb->cb buffer is large enough to hold the j1939_sk_buff_cb structure. [mkl: rephrase commit message]

—No exploit Fix available
Published
Dec 24, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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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.

—

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

    • 5.4affected
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before d2136f05690c272dfc9f9d6efcc51d5f53494b33affected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 70caa596d158a5d84b117f722d58f3ea503a5ba9affected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 4fe1d9b6231a68ffc91318f57fd8e4982f028cf7affected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 4c3fb22a6ec68258ee129a2e6b720f43dffc562faffected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 36befc9aed6202b4a9b906529aea13eacd7e34ffaffected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before b45193cb4df556fe6251b285a5ce44046dd36b4aaffected · git
    • before 5.4not affected · semver
    • 5.4.241 and later · up to and including 5.4.*not affected · semver
    • 5.10.178 and later · up to and including 5.10.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.25-16.1.25-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-54037Dec 24, 2025 · ice: prevent NULL pointer deref during reload
    0Monitor
  • ← EarlierCVE-2023-54038Dec 24, 2025 · Bluetooth: hci_conn: return ERR_PTR instead of NULL when there is no link
    0Monitor
  • Later →CVE-2023-54041Dec 24, 2025 · io_uring: fix memory leak when removing provided buffers
    0Monitor

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 Linux36befc9aed6202b4a9b906529aea13eacd7e34ffVendor (CNA)
Linux Linux4c3fb22a6ec68258ee129a2e6b720f43dffc562fVendor (CNA)
Linux Linux4fe1d9b6231a68ffc91318f57fd8e4982f028cf7Vendor (CNA)
Linux Linux70caa596d158a5d84b117f722d58f3ea503a5ba9Vendor (CNA)
Linux Linuxb45193cb4df556fe6251b285a5ce44046dd36b4aVendor (CNA)
Linux Linuxd2136f05690c272dfc9f9d6efcc51d5f53494b33Vendor (CNA)
debian:linux6.1.25-1 · 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).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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References

Show all references (5 more)

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

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