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NVD / CVE Program· CNA Linux

CVE-2026-93286: net: appletalk: fix NULL pointer dereference in aarp_send_ddp()

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 51cc5e756cec6071ffc620076aebcf5bae936668, 542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680, 83899a056aeb120898a6e3a989971fc63e274e2e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 51cc5e756cec6071ffc620076aebcf5bae936668, 542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680, 83899a056aeb120898a6e3a989971fc63e274e2e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: net: appletalk: fix NULL pointer dereference in aarp_send_ddp() aarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast path without checking for NULL. When the device has no AppleTalk interface configured (dev->atalk_ptr == NULL), this leads to a NULL pointer dereference at the at->s_net access. KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:aarp_send_ddp (net/appletalk/aarp.c:552 (discriminator 2)) Call Trace: <TASK> atalk_sendmsg (net/appletalk/ddp.c:1715) __sys_sendto (net/socket.c:2265 (discriminator 1)) __x64_sys_sendto (net/socket.c:2272) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Add a NULL check consistent with the other callers of atalk_find_dev_addr().

—No exploit Fix available
Published
Sep 24, 2026
Updated
Oct 3, 2026
EPSS
0.1% · 6th 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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 51cc5e756cec6071ffc620076aebcf5bae936668affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8c4b9ceb1be780588c1c50d573d5ee308e0874d2affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before d643fd42ad96f19b5ce5cb11824fefa617191dbeaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 83899a056aeb120898a6e3a989971fc63e274e2eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9e7f36ab5b7bf68463faa5f7b926fea8f35597bbaffected · git
    • before 2.6.12not affected · semver
    • 5.10.271 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 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.1.3-17.1.3-1

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-2026-93284Sep 24, 2026 · drm/pagemap: dma-unmap pages before handling migration errors
    35Monitor
  • ← EarlierCVE-2026-93285Sep 24, 2026 · f2fs: embed f2fs_gc_kthread in f2fs_sb_info
    0Monitor
  • Later →CVE-2026-93287Sep 24, 2026 · i2c: smbus: reject oversized block transfers in the common path
    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 Linux51cc5e756cec6071ffc620076aebcf5bae936668Vendor (CNA)
Linux Linux542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680Vendor (CNA)
Linux Linux83899a056aeb120898a6e3a989971fc63e274e2eVendor (CNA)
Linux Linux8c4b9ceb1be780588c1c50d573d5ee308e0874d2Vendor (CNA)
Linux Linux8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2cVendor (CNA)
Linux Linux9e7f36ab5b7bf68463faa5f7b926fea8f35597bbVendor (CNA)
Linux Linuxd643fd42ad96f19b5ce5cb11824fefa617191dbeVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · 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