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CVE-2022-41858 is a null-pointer dereference in the Linux SLIP network driver (drivers/net/slip) that can crash the kernel. A race condition can leave sl_tx_timeout() dereferencing the SLIP device's sl->tty pointer after slip_close() clears it during device detachment; an attacker able to emulate a SLIP network interface from user space could trigger a denial of service.
Red Hat shipped fixes across RHEL kernel update streams, including RHSA-2024:1367 for selected RHEL 8.4 channels, which requires kernel version 4.18.0-305.125.1.el8_4 or later and a reboot. Related March kernel advisories also delivered fixes for other networking and kernel flaws: RHSA-2024:1377 provides an updated RHEL 8.4 kpatch-patch live-patching module, while RHSA-2024:1332 updates RHEL 7 Real Time kernel-rt packages and requires a reboot.
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2 events from the most recent confirmed update back to the earliest known activity.
Red Hat issued RHSA-2024:1367, rated Important, to remediate CVE-2022-41858 in the Linux SLIP driver's sl_tx_timeout function for selected RHEL 8.4 update-service channels. The update provides kernel version 4.18.0-305.125.1.el8_4 and requires a reboot for the fixes to take effect.
Red Hat released RHSA-2024:0897 for the RHEL 8 kernel and RHSA-2024:0881 for the RHEL 8 real-time kernel to address CVE-2022-41858. The flaw affects the Linux SLIP driver's sl_tx_timeout function and could allow a local low-privileged attacker to crash a system or disclose kernel information.
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Red Hat released kernel updates for **RHEL 9** and **RHEL 10** addressing several locally exploitable Linux kernel flaws, including `CVE-2025-21647` in the `sch_cake` traffic-control scheduler. An underflow in per-host bulk-flow fairness counters could lead to an out-of-bounds read, potentially exposing kernel memory or crashing the system; Red Hat assigned it a CVSS 3.1 score of 7.1. The upstream correction adds centralized bounds checking for counter access. The updates also remediate denial-of-service issues in the mt76 `mt7925` Wi-Fi driver (`CVE-2024-57989`), HID core (`CVE-2024-57986`), IDPF driver (`CVE-2024-58057`), and Realtek Bluetooth setup path (`CVE-2024-57987`). These flaws can trigger NULL-pointer dereferences, CPU-workqueue starvation, or system crashes under local attack conditions. RHEL 9 `kernel-rt` remains affected or will not fix for several listed issues; organizations should apply the applicable kernel errata and reboot systems to activate the patched kernel.
Aug 26, 2026
**CVE-2024-36489** affects the Linux kernel TLS subsystem because `tls_init()` lacked a write memory barrier. On systems permitting store-store reordering, TLS `setsockopt` or `getsockopt` operations can observe an uninitialized `ctx->sk_proto` value and trigger a NULL-pointer dereference, creating an availability risk. Red Hat rates the flaw Low severity, with a product-specific CVSS v3.1 score of 6.1; NVD scores it 5.5. Upstream fixes are available in Linux kernel versions 5.10.219, 5.15.161, 6.1.93, 6.6.33, 6.9.4, and 6.10-rc1. Red Hat issued errata for affected RHEL 8 and RHEL 9 kernel and kernel-rt streams, including relevant EUS and specialized-support offerings, while RHEL 6 is not affected. Organizations should identify hosts running affected kernel builds and apply the applicable vendor kernel updates.
Aug 26, 2026
**CVE-2021-47468** affects the Linux kernel's mISDN NetJet ISDN driver, where `card->isac.release()` can be invoked while a lock is held in an atomic context. Because the release path may sleep, a local attacker able to exercise the affected device-removal path could trigger a kernel fault or denial of service. The upstream fix defers the release-function call until after the lock has been released. The fix was backported to stable kernels including 4.4.290, 4.9.288, 4.14.253, 4.19.214, 5.4.156, 5.10.76, 5.14.15, and 5.15. Red Hat rated the flaw Low severity (CVSS 4.4) and released RHEL 8 kernel updates through advisories including **RHSA-2024:5101** and **RHSA-2024:5102**; RHEL 9 is not affected. Organizations should deploy their vendor's current kernel updates rather than cherry-picking the upstream patch.
Aug 26, 2026