सुरक्षा सलाह पर वापस जाएँ
Kernel-Rt Security Update — AlmaLinux 8 (ALSA-2026:21745)
ALSA-2026:21745 updates the real-time kernel (kernel-rt) on AlmaLinux 8, fixing a large batch of vulnerabilities including Bluetooth MGMT use-after-free (CVE-2025-39981), an IMA signature-flag clearing flaw (CVE-2025-68183), a firewire-motu DSP-event buffer overflow (CVE-2025-68347), libceph and further 2026 CVEs — aggregate CVSS 7.8. Only servers running the RT kernel are affected: dnf update kernel-rt and reboot.
High
7.8 CVSS
AlmaLinux 8
SharedLicense लाइसेंस के तहत इसका अर्थ
Use-after-free and buffer-overflow classes in the RT kernel carry the same escalation potential as the standard kernel — on real-time workloads (latency-sensitive processing nodes), a local user can crash or compromise the whole host.
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: Bluetooth: MGMT: Fix possible UAFs (CVE-2025-39981) * kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183) * kernel: ALSA: firewire-motu: fix buffer overflow in hwdep read for DSP events (CVE-2025-68347) * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116) * kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243) * kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270) * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455) * kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold (CVE-2026-31408) * kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532) * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684) * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685) * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027) * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020) * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051) * kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709) * kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163) * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190) * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158) 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.
अक्सर पूछे जाने वाले प्रश्न
What is ALSA-2026:21745?
It is AlmaLinux's Important-rated erratum for the kernel-rt real-time kernel on AlmaLinux 8, fixing a large set of CVEs including Bluetooth MGMT use-after-frees (CVE-2025-39981), IMA xattr flag handling (CVE-2025-68183), ALSA firewire-motu buffer overflow (CVE-2025-68347) and multiple 2026 kernel CVEs, at aggregate CVSS 7.8.
Am I affected if I run the standard kernel?
No — this erratum is specifically for the kernel-rt packages used where deterministic latency matters. Servers on the standard kernel get the equivalent fixes through the regular kernel errata instead.
How do I apply the fix?
Run dnf update kernel-rt* and reboot into the updated RT kernel; verify with uname -v (RT kernels carry the PREEMPT_RT suffix) and check the version matches the erratum's build.
Which of the fixed flaws are most notable?
The Bluetooth MGMT use-after-frees matter most for servers with Bluetooth controllers, and the IMA flaw affects systems relying on integrity measurement — a crafted xattr operation could clear the IMA_DIGSIG flag and undermine signature enforcement.
संदर्भ
अपने सिस्टम में भेद्यताओं की जाँच करें
अपना उत्पाद और ऑपरेटिंग सिस्टम चुनें ताकि आपके लिए लागू सटीक फिक्स कमांड देख सकें।
अपना सिस्टम जाँचें