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
This Red Hat security advisory (RHSA-2026:19568) covers a kernel update for Red Hat Enterprise Linux 9 and related products that fixes 17 vulnerabilities in the Linux kernel. These include CVE-2025-39766 (net/sched buffer limit handling), CVE-2025-68741 (scsi qla2xxx improper freeing), multiple libceph issues (CVE-2025-71116, CVE-2026-22984, CVE-2026-22990, CVE-2026-23136), use-after-free and denial of service bugs in traffic control and KVM (CVE-2026-23270, CVE-2026-23401), heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402), and others. The advisory highlights two local privilege escalation vulnerabilities known as "Dirty Frag" (CVE-2026-43284) and its variant "Fragnesia" (CVE-2026-46300). The update is rated Important by Red Hat and requires rebooting the system to take effect.
Potential Impact
The vulnerabilities fixed in this advisory can lead to local privilege escalation, denial of service, information disclosure, and potential system instability. The "Dirty Frag" and "Fragnesia" vulnerabilities are universal local privilege escalations in the Linux kernel, which could allow an unprivileged user to gain elevated privileges. Other flaws include use-after-free conditions, heap overflows, and improper memory handling that may cause crashes or allow attackers to disrupt system operations or escalate privileges. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released an official kernel update that addresses all listed vulnerabilities. Users of Red Hat Enterprise Linux 9 and related variants should apply the update promptly following Red Hat's published guidance at https://access.redhat.com/articles/11258. A system reboot is required for the update to take effect. No additional mitigations are indicated 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
This Red Hat security advisory (RHSA-2026:19568) covers a kernel update for Red Hat Enterprise Linux 9 and related products that fixes 17 vulnerabilities in the Linux kernel. These include CVE-2025-39766 (net/sched buffer limit handling), CVE-2025-68741 (scsi qla2xxx improper freeing), multiple libceph issues (CVE-2025-71116, CVE-2026-22984, CVE-2026-22990, CVE-2026-23136), use-after-free and denial of service bugs in traffic control and KVM (CVE-2026-23270, CVE-2026-23401), heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402), and others. The advisory highlights two local privilege escalation vulnerabilities known as "Dirty Frag" (CVE-2026-43284) and its variant "Fragnesia" (CVE-2026-46300). The update is rated Important by Red Hat and requires rebooting the system to take effect.
Potential Impact
The vulnerabilities fixed in this advisory can lead to local privilege escalation, denial of service, information disclosure, and potential system instability. The "Dirty Frag" and "Fragnesia" vulnerabilities are universal local privilege escalations in the Linux kernel, which could allow an unprivileged user to gain elevated privileges. Other flaws include use-after-free conditions, heap overflows, and improper memory handling that may cause crashes or allow attackers to disrupt system operations or escalate privileges. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released an official kernel update that addresses all listed vulnerabilities. Users of Red Hat Enterprise Linux 9 and related variants should apply the update promptly following Red Hat's published guidance at https://access.redhat.com/articles/11258. A system reboot is required for the update to take effect. No additional mitigations are indicated 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"]
Threat ID: 6a175eede29bf47b50edbb81
Added to database: 05/27/2026, 21:15:25 UTC
Last enriched: 08/07/2026, 02:37:51 UTC
Last updated: 09/14/2026, 14:41:08 UTC
Views: 138
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