DirtyFrag-for-dummies

Dirty Frag / CVE-2026-43284 — 研究ノート 概要 このリポジトリは、Dirty Frag として広く知られ、xfrm-ESP パスでは CVE-2026-43284 として追跡されている Linux カーネルの脆弱性に関する、整理された技術図と補足ノートを含んでいます。 この問題は、Hyunwoo Kim @v4bel によって発見された、より広範な Dirty Frag クラスに属します。関連する RxRPC の亜種は CVE-2026-43500 として別途追跡されています。 この資料の目的は次のとおりです。 システムレベルでバグのメカニズムを説明すること...

Astra Linux – Vulnerabilities in Linux, Linux-5.15, Linux-5.10, Linux-6.1

In the Linux kernel, the following vulnerabilities have been resolved: rxrpc: DATA/RESPONSE packets are also unshared when paged fragments are present. The DATA-packet handler in rxrpcinputcallevent and the RESPONSE handler in rxrpcverifyresponse copy the skb into a linear sequence before calling...

CVE-2026-74747

CVE-2026-74747 affects the Linux kernel in the ipvs (IP Virtual Server) subsystem, specifically in ip_vs_nat_icmp() . After reading embedded IP headers from skb frags, the ihl field is not revalidated; a local process can modify it so that after skb_ensure_writable() a larger value is visible, ca...

CVE-2026-74665

A flaw was found in the Linux kernel. Incorrect length accounting for skb socket buffer fragments after an eXpress Data Path XDP program adjusts the fragment area can lead to an out-of-bounds read. This allows an attacker to potentially disclose sensitive kernel pointers and corrupt user-space...

CVE-2026-64414 netfilter: handle unreadable frags

In the Linux kernel, the following vulnerability has been resolved: netfilter: handle unreadable frags sashiko reports: When an skb with unreadable fragments such as from devmem TCP, where skbfragsreadableskb returns false is processed by the u32 module, skbcopybits will safely return a negative...

PT-2026-64635

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the netfilter component where the system fails to properly handle socket buffers skb with unreadable fragments, such as those from devmem TCP. When the skb frags...

xfrm: esp: avoid in-place decrypt on shared skb frags (CVE-2026-43284)

In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSGSPLICEPAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFLSHAREDFRAG after skbsplicefromiter, so later paths that may modify packet data ca...

Linux Distros Unpatched Vulnerability : CVE-2026-53199

"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - hvnetvsc: use kmaplocalpage in netvsccopytosendbuf netvsccopytosendbuf copies page buffer entries into the VMBus send buffer using phystovirt on the entry PFN...

SUSE CVE-2026-53266

In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebtsnat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source address rewrite behind skbensurewritableskb, 0. This is intentional: at the bridge ebtables hooks the Ethernet header is...

CVE-2026-53199 hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf

In the Linux kernel, the following vulnerability has been resolved: hvnetvsc: use kmaplocalpage in netvsccopytosendbuf netvsccopytosendbuf copies page buffer entries into the VMBus send buffer using phystovirt on the entry PFN. Entries for the RNDIS header and the skb linear data come from...

EulerOS Virtualization 2.11.0 : kernel (EulerOS-SA-2026-2427)

According to the versions of the kernel packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : xfrm: esp: avoid in-place decrypt on shared skb fragsCVE-2026-43284 crypto: algifaead - Revert to operating...

EulerOS 2.0 SP12 : kernel (EulerOS-SA-2026-2276)

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : xfrm: esp: avoid in-place decrypt on shared skb fragsCVE-2026-43284 crypto: algifaead - Revert to operating out-of-placeCVE-2026-31431 Tenable has...

EulerOS 2.0 SP12 : kernel (EulerOS-SA-2026-2275)

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : xfrm: esp: avoid in-place decrypt on shared skb fragsCVE-2026-43284 crypto: algifaead - Revert to operating out-of-placeCVE-2026-31431 Tenable has...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: net: esp: fix bad handling of pages from pagepool When the skb is reorganized during espoutput !esp-inline, the pages coming from the original skb fragments are supposed to be released back to the system through putpage. But if t...

SUSE SLES12 / SLES15 Security Update : kernel (Live Patch 32 for SUSE Linux Enterprise 15 SP5) (SUSE-SU-2026:1880-1)

The remote SUSE Linux SLES12 / SLES15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1880-1 advisory. This update for the SUSE Linux Enterprise Kernel 4.12.14-122.255 fixes one security issue The following security issue was fixed: -...

SUSE SLES12 / SLES15 Security Update : kernel (Live Patch 40 for SUSE Linux Enterprise 15 SP4) (SUSE-SU-2026:1906-1)

The remote SUSE Linux SLES12 / SLES15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1906-1 advisory. This update for the SUSE Linux Enterprise Kernel 4.12.14-122.299 fixes one security issue The following security issue was fixed: -...

SUSE-SU-2026:21775-1 Security update for the Linux Kernel RT (Live Patch 1 for SUSE Linux Enterprise 16)

This update for the SUSE Linux Enterprise Kernel 6.12.0-160000.6.1 fixes one security issue The following security issue was fixed: - CVE-2026-43284: xfrm: esp: avoid in-place decrypt on shared skb frags bsc1264459...

SUSE-SU-2026:1959-1 Security update for the Linux Kernel

The SUSE Linux Enterprise 15 SP7 RT kernel was updated to fix various security issues The following security issues were fixed: - CVE-2025-54518: x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache bsc1264013. - CVE-2026-46300: net: skbuff: propagate shared-frag marker...

SUSE-SU-2026:1878-1 Security update for the Linux Kernel (Live Patch 10 for SUSE Linux Enterprise 15 SP6)

This update for the SUSE Linux Enterprise Kernel 6.4.0-150600.23.47 fixes one security issue The following security issue was fixed: - CVE-2026-43284: xfrm: esp: avoid in-place decrypt on shared skb frags bsc1264459...

SUSE SLES15 Security Update : kernel (SUSE-SU-2026:1857-1)

The remote SUSE Linux SLES15 / SLESSAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1857-1 advisory. The SUSE Linux Enterprise 15 SP4 kernel was updated to fix one issue - CVE-2026-43284: xfrm: esp: avoid in-place decrypt on shared skb frags...