CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HIn 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(). A flaw was found in the Linux kernel's `vc_screen` module. A race condition in the `vcs_write()` function can lead to a null pointer dereference. This occurs when the `vc_data` pointer becomes stale during concurrent write operations, and a subsequent call attempts to use the now-invalid pointer. A local attacker could exploit this vulnerability to cause a system crash, resulting in a Denial of Service (DoS).
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Multiple vulnerabilities have been discovered in the Linux kernel of Debian LTS. These vulnerabilities allow for privilege escalation, data compromise, and denial of service. The affected Debian versions include 11 (Bull…
Multiple vulnerabilities have been discovered within the Linux kernel of Debian LTS. These vulnerabilities include potential for data confidentiality breaches, denial of service attacks, and privilege escalation. Several…