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NVD / CVE Program· CNA Linux

CVE-2026-72013: riscv: Prevent NULL pointer dereference in machine_kexec_prepare()

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 5.15.212, 5.18, 5.19.

Low priority for now. Upgrade to Linux Linux 5.15.212, 5.18, 5.19 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: riscv: Prevent NULL pointer dereference in machine_kexec_prepare() A NULL pointer dereference issue is noticed in riscv's machine_kexec_prepare(), where image->segment[i].buf might be NULL and copied unchecked. The NULL buf comes from ima_add_kexec_buffer(), where kbuf is added by kexec_add_buffer(), but kbuf.buffer is NULL, then it is copied without a check in machine_kexec_prepare(): kexec_file_load -> kimage_file_alloc_init() -> kimage_file_prepare_segments() -> ima_add_kexec_buffer() -> kexec_add_buffer() -> machine_kexec_prepare() -> memcpy() Address this by adding a check before the data copy attempt.

—No exploit Fix available
Published
Aug 15, 2026
Updated
Aug 17, 2026
EPSS
0.2% · 11th 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 · 0.2%

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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

    • 3ca8a07f141fd8eec347a82bdfa4b94164f2bb97, 3ba83e46b591381e718007f55c9f831fd0cd7ee8, 5.19affected
    • 4211742f0f9e083188f4f0ada00d6eeeef31b7c7 and later · before 606cc45e871e34b80a2f63874f069387a5b44176affected · git
    • b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 and later · before c462e15497dc40abe369b3be7a2c91ac5d1be6f9affected · git
    • b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 and later · before b5f92cc4e24a298bf390b0b189a4b888c0900161affected · git
    • b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 and later · before 6ad6954492697681ebcfc1beb0eb384406cd4b65affected · git
    • b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 and later · before eadd0c2c76aee6a738f17f251434c77db3c606c8affected · git
    • b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 and later · before d5b2752a17efc165793ae38f2c24b5ed9c04ffdeaffected · git
    • b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 and later · before 81bbcff0c053c4f5c711c31a9b72fc492bd96c3faffected · git
    • 5.15.47 and later · before 5.15.212affected · semver
    • 5.17.15 and later · before 5.18affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

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-2026-72010Aug 15, 2026 · cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed
    0Monitor
  • ← EarlierCVE-2026-72011Aug 15, 2026 · s390/diag: Add missing array_index_nospec() call to memtop_get_page_count()
    0Monitor
  • Later →CVE-2026-72015Aug 15, 2026 · fs/resctrl: Fix double-add of pseudo-locked region's RMID to free list
    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 Linux5.15.212Vendor (CNA)
Linux Linux5.18Vendor (CNA)
Linux Linux5.19Vendor (CNA)
Linux Linux606cc45e871e34b80a2f63874f069387a5b44176Vendor (CNA)
Linux Linux6ad6954492697681ebcfc1beb0eb384406cd4b65Vendor (CNA)
Linux Linux81bbcff0c053c4f5c711c31a9b72fc492bd96c3fVendor (CNA)
Linux Linuxb5f92cc4e24a298bf390b0b189a4b888c0900161Vendor (CNA)
Linux Linuxc462e15497dc40abe369b3be7a2c91ac5d1be6f9Vendor (CNA)
Linux Linuxd5b2752a17efc165793ae38f2c24b5ed9c04ffdeVendor (CNA)
Linux Linuxeadd0c2c76aee6a738f17f251434c77db3c606c8Vendor (CNA)
debian:linux6.1.180-1 · 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).

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 (6 more)

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

All records