CVE-2026-53385
Description
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().
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Windows Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53385
- https://git.kernel.org/stable/c/09a43e81279b8da15526da09877134b8bcf618b0
- https://git.kernel.org/stable/c/43a6281790273c1b0a9ab76609ff0245b968f1e6
- https://git.kernel.org/stable/c/73049768ad57145acd337102c5aa3c788e6642c8
- https://git.kernel.org/stable/c/74be188eb2dc1c99d63986167b9a67d415fe7326
- https://git.kernel.org/stable/c/7cc3dd79777f6ae4625ec37e84dd18a26dc88bde
- https://git.kernel.org/stable/c/8232fca738011ca2ec865b46ec721d1796dc0580
- https://git.kernel.org/stable/c/a287620312dc6dcb9a093417a0e589bf30fcf38a
- https://git.kernel.org/stable/c/b6bbb85cf45bf0b070e741997fe0af3a772c5ad5
- https://git.kernel.org/stable/c/ff4806202749a51938236214adc0281481a57366
- https://www.suse.com/security/cve/CVE-2026-53385.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.