Threats Tagged 'cve-2026-46086'

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086) * kernel: ipv6: fix possible UAF in icmpv6_rcv() (CVE-2026-53006) * kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993) * kernel: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption (CVE-2026-53281) Bug Fix(es) and Enhancement(s): * rxrpc: Address CVE-2026-43500 [rhel-10.2.z] (JIRA:RHEL-178254) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086) * kernel: ipv6: fix possible UAF in icmpv6_rcv() (CVE-2026-53006) * kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993) * kernel: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption (CVE-2026-53281) Bug Fix(es) and Enhancement(s): * rxrpc: Address CVE-2026-43500 [rhel-10.2.z] (JIRA:RHEL-178254) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: Linux kernel: Memory leak in networking due to incorrect GRO packet handling (CVE-2026-22979) * kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499) * kernel: net: bridge: use a stable FDB dst snapshot in RCU readers (CVE-2026-46086) * kernel: crypto: ccp - copy IV using skcipher ivsize (CVE-2026-53016) * kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166) Bug Fix(es) and Enhancement(s): * Kernel panic very early during boot while reading a tracefs file (available_filter_functions) due to invalid module name pointer [9.8.z] (JIRA:RHEL-183236) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

In the Linux kernel, the following vulnerability has been resolved: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in place by `fdb_delete_local()`, which updates `f->dst` to another port or to `NULL` while keeping the entry alive. Several bridge RCU readers inspect `f->dst`, including `br_fdb_fillbuf()` through the `brforward_read()` sysfs path. These readers currently load `f->dst` multiple times and can therefore observe inconsistent values across the check and later dereference. In `br_fdb_fillbuf()`, this means a concurrent local-FDB update can change `f->dst` after the NULL check and before the `port_no` dereference, leading to a NULL-ptr-deref. Fix this by taking a single `READ_ONCE()` snapshot of `f->dst` in each affected RCU reader and using that snapshot for the rest of the access sequence. Also publish the in-place `f->dst` updates in `fdb_delete_local()` with `WRITE_ONCE()` so the readers and writer use matching access patterns.