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NVD / CVE Program· CNA Linux

CVE-2026-74729: soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read

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 131ab677b03349a5ae48da8722ec7075b37ec66e, 1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f, 868c478abce858135db3eb65548a577e4b6747ac.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 131ab677b03349a5ae48da8722ec7075b37ec66e, 1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f, 868c478abce858135db3eb65548a577e4b6747ac 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: soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read put_fifo_with_discard() acts as both producer and consumer on the kfifo: it calls kfifo_skip() (advances out) and kfifo_put() (advances in) from the IRQ handler without synchronizing with snoop_file_read(), which also consumes via kfifo_to_user(). On SMP systems this concurrent access can leave (in - out) larger than the ring buffer, so __kfifo_to_user()'s clamp to (in - out) is ineffective and kfifo_copy_to_user() can attempt a copy_to_user() past the kmalloc-2k backing store: usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-2k' (offset 0, size 2049)! kernel BUG at mm/usercopy.c! Call trace: usercopy_abort __check_heap_object __check_object_size kfifo_copy_to_user __kfifo_to_user snoop_file_read vfs_read Serialize kfifo access with a per-channel spinlock shared between the IRQ handler (producer) and the file reader (consumer). Annotate @fifo with __guarded_by(&lock) and opt the driver into context analysis so the compiler enforces that all fifo access holds the lock.

—No exploit Fix available
Published
Aug 22, 2026
Updated
Oct 30, 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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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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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.

—

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

    • 4.19affected
    • 3772e5da445420543b25825ac2b5971f3743f6e8 and later · before f62afe827c52c300c64715631e6ac9e576c5112daffected · git
    • 3772e5da445420543b25825ac2b5971f3743f6e8 and later · before b87c0d24386ed5106feac12034fe09d893ccb469affected · git
    • 3772e5da445420543b25825ac2b5971f3743f6e8 and later · before afe2527eae0b51d5e8ddd77293afab3a5a1311a4affected · git
    • 3772e5da445420543b25825ac2b5971f3743f6e8 and later · before 868c478abce858135db3eb65548a577e4b6747acaffected · git
    • 3772e5da445420543b25825ac2b5971f3743f6e8 and later · before 131ab677b03349a5ae48da8722ec7075b37ec66eaffected · git
    • 3772e5da445420543b25825ac2b5971f3743f6e8 and later · before 1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6faffected · git
    • before 4.19not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.160 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:14linuxbefore 7.1.9-17.1.9-1

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-2026-74727Aug 22, 2026 · ovpn: skip rehash for peers already removed from by_id
    39Monitor
  • ← EarlierCVE-2026-74728Aug 22, 2026 · xfs: handle NULL b_addr in xfs_buf_free
    0Monitor
  • Later →CVE-2026-74730Aug 22, 2026 · NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
    39Monitor

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 Linux131ab677b03349a5ae48da8722ec7075b37ec66eVendor (CNA)
Linux Linux1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6fVendor (CNA)
Linux Linux868c478abce858135db3eb65548a577e4b6747acVendor (CNA)
Linux Linuxafe2527eae0b51d5e8ddd77293afab3a5a1311a4Vendor (CNA)
Linux Linuxb87c0d24386ed5106feac12034fe09d893ccb469Vendor (CNA)
Linux Linuxf62afe827c52c300c64715631e6ac9e576c5112dVendor (CNA)
debian:linux7.1.9-1 · Debian:14Package 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

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.

All records