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NVD / CVE Program· CNA Linux

CVE-2026-45848: apparmor: fix NULL sock in aa_sock_file_perm

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.16% (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 00b67657535dfea56e84d11492f5c0f61d0af297, 0dc19bca22606f7a61d5988408f74e3ae0ef3486, 3852eb9a0392eb435c03dcb47d581bcfe6a9a95b.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 00b67657535dfea56e84d11492f5c0f61d0af297, 0dc19bca22606f7a61d5988408f74e3ae0ef3486, 3852eb9a0392eb435c03dcb47d581bcfe6a9a95b 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: apparmor: fix NULL sock in aa_sock_file_perm Deal with the potential that sock and sock-sk can be NULL during socket setup or teardown. This could lead to an oops. The fix for NULL pointer dereference in __unix_needs_revalidation shows this is at least possible for af_unix sockets. While the fix for af_unix sockets applies for newer mediation this is still the fall back path for older af_unix mediation and other sockets, so ensure it is covered.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Jun 25, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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.

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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

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.17 and later · before 5.10.252
  • linux linux kernel5.11 and later · before 5.15.202
  • linux linux kernel5.16 and later · before 6.1.165
  • linux linux kernel6.2 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.14
  • linux linux kernel6.19 and later · before 6.19.4

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

    • 4.17affected
    • 56974a6fcfef69ee0825bd66ed13e92070ac5224 and later · before 68538ec34fcb4194c7961dc4eca6f5537fec8067affected · git
    • 56974a6fcfef69ee0825bd66ed13e92070ac5224 and later · before 5121b7283f1c46e4c06b88b1dda7b064429d77deaffected · git
    • 56974a6fcfef69ee0825bd66ed13e92070ac5224 and later · before c11b7c3280d000376e27ebfed17ec7046699eab4affected · git
    • 56974a6fcfef69ee0825bd66ed13e92070ac5224 and later · before 0dc19bca22606f7a61d5988408f74e3ae0ef3486affected · git
    • 56974a6fcfef69ee0825bd66ed13e92070ac5224 and later · before 3852eb9a0392eb435c03dcb47d581bcfe6a9a95baffected · git
    • 56974a6fcfef69ee0825bd66ed13e92070ac5224 and later · before ccb66a3c6c8f51b3ed1bc003b70bb9ff99e8d835affected · git
    • 56974a6fcfef69ee0825bd66ed13e92070ac5224 and later · before 8a0ededbfcff74598f82f1d4b8ef9db28878b317affected · git
    • 56974a6fcfef69ee0825bd66ed13e92070ac5224 and later · before 00b67657535dfea56e84d11492f5c0f61d0af297affected · git
    • before 4.17not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.18.14-16.18.14-1

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-2026-45846May 27, 2026 · bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()
    22Monitor
  • ← EarlierCVE-2026-45847May 27, 2026 · net: remove WARN_ON_ONCE when accessing forward path array
    22Monitor
  • Later →CVE-2026-45849May 27, 2026 · net: mscc: ocelot: add missing lock protection in ocelot_port_xmit_inj()
    22Monitor

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 Linux00b67657535dfea56e84d11492f5c0f61d0af297Vendor (CNA)
Linux Linux0dc19bca22606f7a61d5988408f74e3ae0ef3486Vendor (CNA)
Linux Linux3852eb9a0392eb435c03dcb47d581bcfe6a9a95bVendor (CNA)
Linux Linux5121b7283f1c46e4c06b88b1dda7b064429d77deVendor (CNA)
Linux Linux68538ec34fcb4194c7961dc4eca6f5537fec8067Vendor (CNA)
Linux Linux8a0ededbfcff74598f82f1d4b8ef9db28878b317Vendor (CNA)
Linux Linuxc11b7c3280d000376e27ebfed17ec7046699eab4Vendor (CNA)
Linux Linuxccb66a3c6c8f51b3ed1bc003b70bb9ff99e8d835Vendor (CNA)
debian:linux6.1.170-1 · 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).

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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records