cve_2026_31431

CVE-2026-31431 "복사 실패" 툴킷 Linux algifaead / authencesn 페이지 캐시 스크래치 쓰기 버그2026-04-29 공개에 대한 탐지기 및 개념 증명 LPE로컬 권한 상승입니다. 공개 분석 글: https://xint.io/blog/copy-fail-linux-distributions 사용 승인 소유한 호스트나 명시적으로 평가를 의뢰받은 호스트에서만 사용하십시오. 이 LPE는 메모리 내 상태페이지 캐시를 수정하지만, 이 기법은 실제 권한 상승입니다 — 승인 없이 시스템에서 실행하면 대부분의...

CVE-2009-2698

CVE-2009-2698 CVE-2009-2698 CentOS 4.8용으로 컴파일됨 https://github.com/SecWiki/linux-kernel-exploits/tree/4dca098e7491efc83903494d7c00f24c843aae99/2009/CVE-2009-2698 상세 hacker@localhost $ id uid=500hacker gid=500hacker groups=500hacker context=useru:systemr:unconfinedt hacker@localhost $ gcc 36108.c -...

CVE-2026-64600-Refluxfs-PoC

RefluXFS CVE-2026-64600 PoC 이 저장소는 Qualys 보안 팀이 보고한 훌륭한 XFS COW 관련 경쟁 조건 취약점의 PoC를 포함합니다. 1 2 PoC 정보 Qualys 권고문의 훌륭한 분석을 바탕으로 직접 작성했습니다. /etc/passwd 파일의 처음 4KB를 원래 내용으로 다시 쓰고, root 사용자 줄인 root:x:0:0:root:/root:/bin/bash를 root::0:0:root:/root:/bin/bash로 바꿉니다. 차이점이 보이나요? 이제 root 사용자는 암호가 없으므로 su -를...

CVE-2026-23416-POC

CVE-2026-23416 — PoC mm/mseal: 병합 시 VMA end 값을 올바르게 업데이트 Antonius / Blue Dragon Security 가 발견한 취약점 개요 필드| 세부 정보 ---|--- CVE ID| CVE-2026-23416 서브시스템| mm/mseal — mm/vma.c 영향 범위| Linux 커널 6.17 7.0-rc5 수정 버전| Linux 7.0-rc6, stable 백포트 6.18.21, 6.19.11 필요한 접근 권한| 권한 없는 사용자 UID 1000, capabilities 없음 사...

kernel: net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink

A flaw was found in the Linux kernel's IP Generic Routing Encapsulation ipgre component. This vulnerability allows a local attacker with network administration capabilities in one network namespace to modify a tunnel residing in a different network namespace where they lack privileges. This is du...

kernel: Linux kernel: Denial of Service in QFQ scheduler via child qlen manipulation

A flaw was found in the Linux kernel's Quick Fair Queuing QFQ scheduler. The QFQ class deactivation logic incorrectly relies on a child qdisc's queue length qlen to determine if a class is active. A local user with CAPNETADMIN capabilities can manipulate the child qlen into an unexpected state...

kernel: gfs2: Fix slab-use-after-free in qd_put

A flaw was found in the Linux kernel's GFS2 file system. During filesystem shutdown, quota data objects were freed without being properly removed from the Least Recently Used LRU list. This oversight could lead to a use-after-free vulnerability, where the system attempts to access memory that has...

kernel: gfs2: add some missing log locking

A flaw was found in the Linux kernel's Global File System 2 GFS2 component. The gfs2logd function, responsible for log flushing, calls several log flushing functions without holding the required lock. This omission allows concurrent transactions to access shared resources without proper exclusion...

kernel: Linux kernel: Use-after-free in xc5000 tuner driver due to race condition

A use-after-free flaw was identified in the Linux kernel’s media tuner xc5000 driver. In the vulnerable code path, xc5000release calls canceldelayedwork to cancel a pending delayed work item timersleep without guaranteeing that the work handler has fully completed. Under a race condition, the...

kernel: nvme: add missing SRCU grace period in error path

A flaw was found in the NVMe Non-Volatile Memory Express driver of the Linux kernel. The nvmeallocns function's error handling path fails to wait for all SRCU Sleepable Read-Copy Update readers to complete before freeing a namespace structure. This oversight allows a concurrent reader to access a...

kernel: net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink

A flaw was found in the Linux kernel's ip6gre and ip6erspan tunnel drivers. The changelink functions in these drivers do not adequately verify administrative capabilities CAPNETADMIN across different network namespaces. This allows a local attacker, who has CAPNETADMIN in one network namespace bu...

kernel: RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send

A flaw was found in the Linux kernel's Remote Direct Memory Access RDMA subsystem, specifically within the ibuverbspostsend function. A local user can exploit this vulnerability by providing an invalid work queue element size wqesize from userspace without proper validation. This can lead to an...

kernel: vxlan: require CAP_NET_ADMIN in the device netns for changelink

A flaw was found in the Linux kernel's VXLAN Virtual Extensible LAN implementation. A local attacker, with CAPNETADMIN network administration capability in one network namespace, could exploit an incorrect privilege check in the rtnl changelink path. This allows the attacker to modify the...

kernel: net/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list

A flaw was found in the Linux kernel's mlx5 driver. The mlx5querynicvportmaclist function, which handles querying network interface card NIC virtual port vport MAC addresses, incorrectly sizes its internal buffer. When a Virtual Function VF vport is queried with a larger configured maximum, the...

kernel: nvme-tcp: fix host memory disclosure on R2T for a read command

A flaw was found in the Linux kernel's NVMe Non-Volatile Memory Express over TCP nvme-tcp component. A malicious NVMe controller can exploit this vulnerability by sending a Ready to Transfer R2T command for a read request. The host system, failing to properly validate the request direction, will...

kernel: ipvs: clear IPv4 options after rebasing tunnel ICMP errors

A flaw was found in the Linux kernel's IP Virtual Server IPVS component. When processing Internet Control Message Protocol ICMP errors for tunneled packets, the system can incorrectly use a stale IPv4 option offset. A remote attacker could exploit this by sending a specially crafted ICMP packet,...

kernel: KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path

A flaw was found in the Linux kernel's Kernel-based Virtual Machine KVM module, specifically within the Secure Virtual Machine SVM component. The sevdbgcrypt function, when handling encryption, incorrectly calculates the transfer length, leading to a page overflow. This memory corruption can resu...

kernel: Linux kernel: Denial of Service in RDMA/bnxt_re driver due to race condition during QP destruction

A flaw was found in the Linux kernel's Remote Direct Memory Access RDMA bnxtre driver. A local user could exploit a race condition that occurs when a Queue Pair QP is destroyed, but completion queue CQ polling continues. This can lead to a kernel panic, resulting in a Denial of Service DoS on the...

kernel: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()

A flaw was found in the Linux kernel's tunnels module. This vulnerability occurs when the iptunnelpmtudcheckicmp function is called without the skb transport header being properly set. An attacker could exploit this condition to trigger an out-of-bound memory access, which may lead to system...

kernel: tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()

A flaw was found in the Linux kernel's tunnels module. This vulnerability, categorized as a Use-After-Free UAF, arises from improper handling of network header pointers during certain packet processing operations. Specifically, functions responsible for building Internet Control Message Protocol...