Red Hat Security Advisory: kernel security update
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: sched: sch_cake: add bounds checks to host bulk flow fairness counts (CVE-2025-21647) * kernel: NFS: Fix potential buffer overflowin nfs_sysfs_link_rpc_client() (CVE-2024-54456) * kernel: workqueue: Put the pwq after detaching the rescuer from the pool (CVE-2025-21786) * kernel: vrf: use RCU protection in l3mdev_l3_out() (CVE-2025-21791) * kernel: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem (CVE-2025-38022) * kernel: smb: client: Fix use-after-free in cifs_fill_dirent (CVE-2025-38051) * kernel: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing (CVE-2025-38568) * kernel: Linux kernel: Out-of-bounds write in Bluetooth MGMT can lead to information disclosure and denial of service (CVE-2025-40294) * kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling (CVE-2025-40322) * kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid (CVE-2025-68349) 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.
AI Analysis
Technical Summary
The advisory covers a set of ten vulnerabilities in the Linux kernel used by Red Hat Enterprise Linux 9.6 Extended Update Support. These include CVE-2024-54456 (potential buffer overflow in NFS), CVE-2025-21647 (bounds checks in scheduler), CVE-2025-21786 (workqueue detachment ordering), CVE-2025-21791 (RCU protection in VRF), CVE-2025-38022 (use-after-free in RDMA core), CVE-2025-38051 (use-after-free in SMB client), CVE-2025-38568 (stack out-of-bounds write in network scheduler), CVE-2025-40294 (out-of-bounds write in Bluetooth MGMT causing info disclosure and DoS), CVE-2025-40322 (out-of-bounds read in font glyph handling causing info disclosure and DoS), and CVE-2025-68349 (NFSv4/pNFS stateid invalidation). The advisory provides patches for these issues and requires rebooting the system after applying the update.
Potential Impact
The vulnerabilities collectively may lead to information disclosure, denial of service, and memory corruption issues such as buffer overflows and use-after-free conditions within the kernel. These could affect system stability and security by allowing attackers to cause crashes or potentially leak sensitive information. The overall security impact is rated as moderate by Red Hat.
Mitigation Recommendations
A security update for the Linux kernel packages is available for Red Hat Enterprise Linux 9.6 Extended Update Support. Users should apply the update as described in the Red Hat advisory RHSA-2026:2352 and reboot their systems to ensure the fixes take effect. No additional mitigations are specified beyond applying the official update and rebooting.
Red Hat Security Advisory: kernel security update
Description
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: sched: sch_cake: add bounds checks to host bulk flow fairness counts (CVE-2025-21647) * kernel: NFS: Fix potential buffer overflowin nfs_sysfs_link_rpc_client() (CVE-2024-54456) * kernel: workqueue: Put the pwq after detaching the rescuer from the pool (CVE-2025-21786) * kernel: vrf: use RCU protection in l3mdev_l3_out() (CVE-2025-21791) * kernel: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem (CVE-2025-38022) * kernel: smb: client: Fix use-after-free in cifs_fill_dirent (CVE-2025-38051) * kernel: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing (CVE-2025-38568) * kernel: Linux kernel: Out-of-bounds write in Bluetooth MGMT can lead to information disclosure and denial of service (CVE-2025-40294) * kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling (CVE-2025-40322) * kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid (CVE-2025-68349) 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.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers a set of ten vulnerabilities in the Linux kernel used by Red Hat Enterprise Linux 9.6 Extended Update Support. These include CVE-2024-54456 (potential buffer overflow in NFS), CVE-2025-21647 (bounds checks in scheduler), CVE-2025-21786 (workqueue detachment ordering), CVE-2025-21791 (RCU protection in VRF), CVE-2025-38022 (use-after-free in RDMA core), CVE-2025-38051 (use-after-free in SMB client), CVE-2025-38568 (stack out-of-bounds write in network scheduler), CVE-2025-40294 (out-of-bounds write in Bluetooth MGMT causing info disclosure and DoS), CVE-2025-40322 (out-of-bounds read in font glyph handling causing info disclosure and DoS), and CVE-2025-68349 (NFSv4/pNFS stateid invalidation). The advisory provides patches for these issues and requires rebooting the system after applying the update.
Potential Impact
The vulnerabilities collectively may lead to information disclosure, denial of service, and memory corruption issues such as buffer overflows and use-after-free conditions within the kernel. These could affect system stability and security by allowing attackers to cause crashes or potentially leak sensitive information. The overall security impact is rated as moderate by Red Hat.
Mitigation Recommendations
A security update for the Linux kernel packages is available for Red Hat Enterprise Linux 9.6 Extended Update Support. Users should apply the update as described in the Red Hat advisory RHSA-2026:2352 and reboot their systems to ensure the fixes take effect. No additional mitigations are specified beyond applying the official update and rebooting.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:2352
- Cve Count
- 10
- Additional Cves
- ["CVE-2025-21647","CVE-2025-21786","CVE-2025-21791","CVE-2025-38022","CVE-2025-38051","CVE-2025-38568","CVE-2025-40294","CVE-2025-40322","CVE-2025-68349"]
- Cvss Version
- null
Threat ID: 6a3da1c54853345fc181fc9d
Added to database: 06/25/2026, 21:46:45 UTC
Last enriched: 06/25/2026, 21:56:39 UTC
Last updated: 07/02/2026, 20:51:14 UTC
Views: 10
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