Tracker / CVE-2026-53385
CVE-2026-53385
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().
Prodotti e versioni affette
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 4.14.327 → 4.15 |
| linux | linux_kernel · 4.19.284 → 4.20 |
| linux | linux_kernel · 5.10.181 → 5.10.260 |
| linux | linux_kernel · 5.15.113 → 5.15.211 |
| linux | linux_kernel · 5.4.244 → 5.5 |
| linux | linux_kernel · 6.1.30 → 6.1.177 |
| linux | linux_kernel · 6.13 → 6.18.37 |
| linux | linux_kernel · 6.19 → 7.0.14 |
| linux | linux_kernel · 6.3.4 → 6.4 |
| linux | linux_kernel · 6.4.1 → 6.6.144 |
| linux | linux_kernel · 6.7 → 6.12.95 |
| linux | linux_kernel · 7.1 → 7.1.2 |