| Name | 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(). |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4700-1, DLA-4717-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bullseye | 5.10.223-1 | vulnerable |
| bullseye (security) | 5.10.262-1 | fixed | |
| bookworm | 6.1.176-1 | vulnerable | |
| bookworm (security) | 6.1.180-1 | fixed | |
| trixie | 6.12.94-1 | vulnerable | |
| trixie (security) | 6.12.101-1 | fixed | |
| forky, sid | 7.1.7-1 | fixed | |
| linux-6.1 (PTS) | bullseye (security) | 6.1.180-1~deb11u1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | bullseye | 5.10.262-1 | DLA-4717-1 | ||
| linux | source | bookworm | 6.1.177-1 | |||
| linux | source | trixie | 6.12.95-1 | |||
| linux | source | (unstable) | 7.0.14-1 | |||
| linux-6.1 | source | bullseye | 6.1.177-1~deb11u1 | DLA-4700-1 |
https://git.kernel.org/linus/a287620312dc6dcb9a093417a0e589bf30fcf38a (7.2-rc1)