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CVE-2026-53385· NVD / CVE Program· CNA Linux

vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write

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: 0.13% (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 09a43e81279b8da15526da09877134b8bcf618b0, 4.15, 4.20; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 09a43e81279b8da15526da09877134b8bcf618b0, 4.15, 4.20; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 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: vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write A KASAN null-ptr-deref was observed in vcs_notifier(): BUG: KASAN: null-ptr-deref in vcs_notifier+0x98/0x130 Read of size 2 at addr qmp_cmd_name: qmp_capabilities, arguments: {} The issue is a race condition in vcs_write(). When the console_lock is temporarily dropped (to copy data from userspace), the vc_data pointer obtained from vcs_vc() may become stale. After re-acquiring the lock, vcs_vc() is called again to re-validate the pointer. If the vc has been deallocated in the meantime, vcs_vc() returns NULL, and the while loop breaks (with written > 0). However, after the loop, vcs_scr_updated(vc) is still called with the now-NULL vc pointer, leading to a null pointer dereference in the notifier chain (vcs_notifier dereferences param->vc). Fix this by adding a NULL check for vc before calling vcs_scr_updated().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 19, 2026
Updated
Aug 17, 2026
EPSS
0.1% · 2th 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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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 kernel4.14.327 and later · before 4.15
  • linux linux kernel4.19.284 and later · before 4.20
  • linux linux kernel5.4.244 and later · before 5.5
  • linux linux kernel5.10.181 and later · before 5.10.260
  • linux linux kernel5.15.113 and later · before 5.15.211
  • linux linux kernel6.1.30 and later · before 6.1.177
  • linux linux kernel6.3.4 and later · before 6.4
  • linux linux kernel6.4.1 and later · before 6.6.144
  • linux linux kernel6.7 and later · before 6.12.95
  • linux linux kernel6.13 and later · before 6.18.37
  • linux linux kernel6.19 and later · before 7.0.14
  • linux linux kernel7.1 and later · before 7.1.2
  • linux linux kernel6.4

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

    • 934de9a9b659785fed3e820bc0c813a460c71fea, 0deff678157333d775af190f84696336cdcccd6d, a4e3c4c65ae8510e01352c9a4347e05c035b2ce2, 1de42e7653d6714a7507ba6696151a1fa028c69f, 6.4affected
    • 11dddfbb7a4e62489b01074d6c04d9d1b42e4047 and later · before 43a6281790273c1b0a9ab76609ff0245b968f1e6affected · git
    • e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67 and later · before b6bbb85cf45bf0b070e741997fe0af3a772c5ad5affected · git
    • 3338d0b9acde770ee588eead5cac32c25e7048fc and later · before ff4806202749a51938236214adc0281481a57366affected · git
    • 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 and later · before 8232fca738011ca2ec865b46ec721d1796dc0580affected · git
    • 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 and later · before 73049768ad57145acd337102c5aa3c788e6642c8affected · git
    • 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 and later · before 7cc3dd79777f6ae4625ec37e84dd18a26dc88bdeaffected · git
    • 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 and later · before 74be188eb2dc1c99d63986167b9a67d415fe7326affected · git
    • 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 and later · before 09a43e81279b8da15526da09877134b8bcf618b0affected · git
    • 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 and later · before a287620312dc6dcb9a093417a0e589bf30fcf38aaffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.177-16.1.177-1
Debian:13linuxbefore 6.12.95-16.12.95-1
Debian:14linuxbefore 7.0.14-17.0.14-1
openSUSE:Tumbleweedkernel-sourcebefore 7.1.4-1.17.1.4-1.1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.333.24.12.14-122.333.2
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_88before 1-8.3.31-8.3.3
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-sourcebefore 4.12.14-122.333.24.12.14-122.333.2
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-symsbefore 4.12.14-122.333.24.12.14-122.333.2

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-53382Jul 19, 2026 · media: vidtv: fix NULL pointer dereference in vidtv_mux_push_si
    22Monitor
  • ← EarlierCVE-2026-53383Jul 19, 2026 · ksmbd: reject non-VALID session in compound request branch
    30Monitor
  • Later →CVE-2026-53386Jul 19, 2026 · iio: adc: ti-ads1298: add bounds check to pga_settings index
    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 Linux09a43e81279b8da15526da09877134b8bcf618b0Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux43a6281790273c1b0a9ab76609ff0245b968f1e6Vendor (CNA)
Linux Linux5.10.260Vendor (CNA)
Linux Linux5.15.211Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux6.1.177Vendor (CNA)
Linux Linux6.4Vendor (CNA)
Linux Linux73049768ad57145acd337102c5aa3c788e6642c8Vendor (CNA)
Linux Linux74be188eb2dc1c99d63986167b9a67d415fe7326Vendor (CNA)
Linux Linux7cc3dd79777f6ae4625ec37e84dd18a26dc88bdeVendor (CNA)
Linux Linux8232fca738011ca2ec865b46ec721d1796dc0580Vendor (CNA)
Linux Linuxa287620312dc6dcb9a093417a0e589bf30fcf38aVendor (CNA)
Linux Linuxb6bbb85cf45bf0b070e741997fe0af3a772c5ad5Vendor (CNA)
Linux Linuxff4806202749a51938236214adc0281481a57366Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.177-1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.1.4-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:kernel-default4.12.14-122.333.2 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.333.2 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-syms4.12.14-122.333.2 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_881-8.3.3 · SUSE:Linux Enterprise Live Patching 12 SP5Package 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 (8 more)

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

All records