In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix UAF in svc_tcp_listen_data_ready() After the listener svc_sock is freed, and before invoking svc_tcp_accept() for the established child sock, there is a window that the newsock retaining a freed listener svc_sock in sk_user_data which cloning from parent. In the race window, if data is received on the newsock, we will observe use-after-free report in svc_tcp_listen_data_ready(). Reproduce by two tasks: 1. while :; do rpc.nfsd 0 ; rpc.nfsd; done 2. while :; do echo "" | ncat -4 127.0.0.1 2049 ; done KASAN report:...
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix UAF in svc_tcp_listen_data_ready() After the listener svc_sock is freed, and before invoking svc_tcp_accept() for the established child sock, there is a window that the newsock retaining a freed listener svc_sock in sk_user_data which cloning from parent. In the race window, if data is received on the newsock, we will observe use-after-free report in svc_tcp_listen_data_ready(). Reproduce by two tasks: 1. while :; do rpc.nfsd 0 ; rpc.nfsd; done 2. while :; do echo "" | ncat -4 127.0.0.1 2049 ; done KASAN report:...
Linux Linux, linux kernel의 현재 전체 버전이 공식 영향 범위(Linux Linux, linux kernel >= fa9251afc33c81606d70cfe91800a779096442ec < c7b8c2d06e437639694abe76978e915cfb73f428, >= fa9251afc33c81606d70cfe91800a779096442ec < dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254, >= fa9251afc33c81606d70cfe91800a779096442ec < 42725e5c1b181b757ba11d804443922982334d9b, >= fa9251afc33c81606d70cfe91800a779096442ec < cd5ec3ee52ce4b7e283cc11facfa420c297c8065, >= fa9251afc33c81606d70cfe91800a779096442ec < fbf4ace39b2e4f3833236afbb2336edbafd75eee, >= fa9251afc33c81606d70cfe91800a779096442ec < ef047411887ff0845afd642d6a687819308e1a4e, >= fa9251afc33c81606d70cfe91800a779096442ec < 7e1f989055622fd086c5dfb291fc72adf5660b6f, >= fa9251afc33c81606d70cfe91800a779096442ec < fc80fc2d4e39137869da3150ee169b40bf879287, >= 4.8, >= 4.8 < 4.14.322, >= 4.15 < 4.19.291, >= 4.20 < 5.4.251, >= 5.5 < 5.10.188, >= 5.11 < 5.15.121, >= 5.16 < 6.1.39, >= 6.2 < 6.4.4)에 포함되는지 확인합니다. OS를 선택하면 해당 OS의 제품·패키지·KB·APAR 확인 명령만 표시됩니다.
조치방안
구조화된 수정 버전 값(4.14.322, 4.19.291, 5.4.251, 5.10.188, 5.15.121, 6.1.39, 6.4.4)은 참고용입니다. 공급사 공식 보안 권고에서 제품·에디션·설치 방식별 수정 기준을 확인한 뒤 적용합니다.
조치 후 확인사항
패치 후 같은 명령으로 전체 버전을 다시 확인해 Linux Linux, linux kernel 4.14.322, 4.19.291, 5.4.251, 5.10.188, 5.15.121, 6.1.39, 6.4.4 기준을 충족하는지 확인합니다. 이어서 메모리 손상 관련 오류·공격 흔적이 새로 발생하지 않는지 확인합니다.
