Read the docs
TI-2026-38471 Aliases CVE-2026-53385GHSA-3f5p-6w75-ppf6

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

Priority LOW 24CWE-476Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

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().

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00132 2nd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.260, 5.15.211, 6.1.177 +10Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux5.10.181 to before 5.10.260; 5.15.113 to before 5.15.211; 6.1.30 to before 6.1.177; 4.14.327 to before 4.15; 4.19.284 to before 4.20; 5.4.244 to before 5.5; 6.3.4 to before 6.45.10.260, 5.15.211, 6.1.177, 4.15, 4.20, 5.5, 6.4Patch availableCNA
LinuxLinux6.4 and later5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 7.0.14, 7.1.2, 7.2Patch availableCNA
  • Linux VendorLinux Affected 5.10.181 to before 5.10.260; 5.15.113 to before 5.15.211; 6.1.30 to before 6.1.177; 4.14.327 to before 4.15; 4.19.284 to before 4.20; 5.4.244 to before 5.5; 6.3.4 to before 6.4 Fixed in 5.10.260, 5.15.211, 6.1.177, 4.15, 4.20, 5.5, 6.4 Patch available CNA
  • Linux VendorLinux Affected 6.4 and later Fixed in 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 7.0.14, 7.1.2, 7.2 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.14.327 to before 4.15; 4.19.284 to before 4.20; 5.4.244 to before 5.5; 5.10.181 to before 5.10.260; 5.15.113 to before 5.15.211; 6.1.30 to before 6.1.177; 6.3.4 to before 6.4; 6.4.1 to before 6.6.144; 6.7 to before 6.12.95; 6.13 to before 6.18.37; 6.19 to before 7.0.14; 7.1 to before 7.1.2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:*6.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.4:rc3:*:*:*:*:*:*6.4 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.4:rc4:*:*:*:*:*:*6.4 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.4:rc5:*:*:*:*:*:*6.4 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.4:rc6:*:*:*:*:*:*6.4 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.4:rc7:*:*:*:*:*:*6.4 rc7VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.14.327 to before 4.15; 4.19.284 to before 4.20; 5.4.244 to before 5.5; 5.10.181 to before 5.10.260; 5.15.113 to before 5.15.211; 6.1.30 to before 6.1.177; 6.3.4 to before 6.4; 6.4.1 to before 6.6.144; 6.7 to before 6.12.95; 6.13 to before 6.18.37; 6.19 to before 7.0.14; 7.1 to before 7.1.2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:* Versions 6.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.4:rc3:*:*:*:*:*:* Versions 6.4 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.4:rc4:*:*:*:*:*:* Versions 6.4 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.4:rc5:*:*:*:*:*:* Versions 6.4 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.4:rc6:*:*:*:*:*:* Versions 6.4 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.4:rc7:*:*:*:*:*:* Versions 6.4 rc7 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.260, 5.15.211, 6.1.177, 4.15, 4.20, 5.5, 6.4
  • Fix · CNA Linux (Linux) Fixed in 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 7.0.14, 7.1.2, 7.2

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53385
  2. 2026-10-03 Alias added: GHSA-3f5p-6w75-ppf6
  3. 2026-10-29 Affected versions changed · Red Hat
  4. 2026-11-06 CISA SSVC decision points changed

References

Patch 9

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences