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: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit (CVE-2025-39766) * kernel: scsi: qla2xxx: Fix improper freeing of purex item (CVE-2025-68741) * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116) * kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984) * kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990) * kernel: Linux kernel: Denial of Service in libceph OSD client due to unreset sparse-read state (CVE-2026-23136) * kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204) * kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270) * kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling (CVE-2026-23401) * kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402) * kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532) * kernel: usbip: validate number_of_packets in usbip_pack_ret_submit() (CVE-2026-31607) * kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163) * kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128) * kernel: "Dirty Frag" is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-43284) * kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300) * kernel: Read root-owned files as an unprivileged user (CVE-2026-46333) 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 kernel security update for Red Hat Enterprise Linux 9 and related products, resolving 17 distinct CVEs affecting the Linux kernel. These vulnerabilities include improper memory handling (use-after-free, heap overflow), denial of service conditions, and local privilege escalation issues. Key fixes address the net/sched subsystem, SCSI driver, Ceph filesystem client, traffic control, KVM virtualization, NFS server, USB/IP, RDMA, and others. The 'Dirty Frag' (CVE-2026-43284) and its variant 'Fragnesia' (CVE-2026-46300) represent new universal local privilege escalation vulnerabilities in the kernel. The advisory provides links to detailed CVE pages and requires rebooting the system after patching.
Potential Impact
Exploitation of these vulnerabilities could allow local attackers to cause denial of service, escalate privileges to root, or read root-owned files without authorization. The range of issues includes memory corruption, use-after-free, heap overflow, and improper validation leading to potential system crashes or privilege escalation. The advisory rates the overall impact as Important (high severity). No known exploits in the wild have been reported at the time of publication.
Mitigation Recommendations
Red Hat has released an official kernel update that addresses all listed vulnerabilities. Users should apply the update promptly following Red Hat's published instructions and reboot the system to ensure the fixes take effect. The advisory indicates the update is available for Red Hat Enterprise Linux 9 and related variants. No additional mitigations are specified beyond applying the official patch 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: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit (CVE-2025-39766) * kernel: scsi: qla2xxx: Fix improper freeing of purex item (CVE-2025-68741) * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116) * kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984) * kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990) * kernel: Linux kernel: Denial of Service in libceph OSD client due to unreset sparse-read state (CVE-2026-23136) * kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204) * kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270) * kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling (CVE-2026-23401) * kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402) * kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532) * kernel: usbip: validate number_of_packets in usbip_pack_ret_submit() (CVE-2026-31607) * kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163) * kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128) * kernel: "Dirty Frag" is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-43284) * kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300) * kernel: Read root-owned files as an unprivileged user (CVE-2026-46333) 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
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers a kernel security update for Red Hat Enterprise Linux 9 and related products, resolving 17 distinct CVEs affecting the Linux kernel. These vulnerabilities include improper memory handling (use-after-free, heap overflow), denial of service conditions, and local privilege escalation issues. Key fixes address the net/sched subsystem, SCSI driver, Ceph filesystem client, traffic control, KVM virtualization, NFS server, USB/IP, RDMA, and others. The 'Dirty Frag' (CVE-2026-43284) and its variant 'Fragnesia' (CVE-2026-46300) represent new universal local privilege escalation vulnerabilities in the kernel. The advisory provides links to detailed CVE pages and requires rebooting the system after patching.
Potential Impact
Exploitation of these vulnerabilities could allow local attackers to cause denial of service, escalate privileges to root, or read root-owned files without authorization. The range of issues includes memory corruption, use-after-free, heap overflow, and improper validation leading to potential system crashes or privilege escalation. The advisory rates the overall impact as Important (high severity). No known exploits in the wild have been reported at the time of publication.
Mitigation Recommendations
Red Hat has released an official kernel update that addresses all listed vulnerabilities. Users should apply the update promptly following Red Hat's published instructions and reboot the system to ensure the fixes take effect. The advisory indicates the update is available for Red Hat Enterprise Linux 9 and related variants. No additional mitigations are specified beyond applying the official patch 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-2026:19568
- Cve Count
- 17
- Additional Cves
- ["CVE-2025-68741","CVE-2025-71116","CVE-2026-22984","CVE-2026-22990","CVE-2026-23136","CVE-2026-23204","CVE-2026-23270","CVE-2026-23401","CVE-2026-31402","CVE-2026-31532","CVE-2026-31607","CVE-2026-43128","CVE-2026-43163","CVE-2026-43284","CVE-2026-46300","CVE-2026-46333"]
- Cvss Version
- null
Threat ID: 6a175eede29bf47b50edbb81
Added to database: 05/27/2026, 21:15:25 UTC
Last enriched: 07/10/2026, 13:02:22 UTC
Last updated: 07/31/2026, 19:22:54 UTC
Views: 98
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