In the Linux kernel, the following vulnerability has been resolved: tcp: cdg: allow tcp_cdg_release() to be called multiple times Apparently, mptcp is able to call tcp_disconnect() on an already disconnected flow. This is generally fine, unless current congestion control is CDG, because it might trigger a double-free [1] Instead of fixing MPTCP, and future bugs, we can make tcp_disconnect() more resilient. [1] BUG: KASAN: double-free in slab_free mm/slub.c:3539 [inline] BUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4567 CPU: 0 PID: 3645 Comm: kworker/0:7 Not tainted 6.0.0-syzkaller-...
In the Linux kernel, the following vulnerability has been resolved: tcp: cdg: allow tcp_cdg_release() to be called multiple times Apparently, mptcp is able to call tcp_disconnect() on an already disconnected flow. This is generally fine, unless current congestion control is CDG, because it might trigger a double-free [1] Instead of fixing MPTCP, and future bugs, we can make tcp_disconnect() more resilient. [1] BUG: KASAN: double-free in slab_free mm/slub.c:3539 [inline] BUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4567 CPU: 0 PID: 3645 Comm: kworker/0:7 Not tainted 6.0.0-syzkaller-...
Linux Linux, linux kernel의 현재 전체 버전이 공식 영향 범위(Linux Linux, linux kernel >= 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e < 0b19171439016a8e4c97eafe543670ac86e2b8fe, >= 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e < 4026033907cc6186d86b48daa4a252c860db2536, >= 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e < 9e481d87349d2282f400ee1d010a169c99f766b8, >= 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e < 78be2ee0112409ae4e9ee9e326151e0559b3d239, >= 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e < 35309be06b6feded2ab2cafbc2bca8534c2fa41e, >= 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e < b49026d9c86f35a4c5bfb8d7345c9c4379828c6b, >= 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e < 1b639be27cbf428a5ca01dcf8b5d654194c956f8, >= 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e < 72e560cb8c6f80fc2b4afc5d3634a32465e13a51, >= 4.2, >= 4.2 < 4.9.334, >= 4.10 < 4.14.300, >= 4.15 < 4.19.267, >= 4.20 < 5.4.225, >= 5.5 < 5.10.156, >= 5.11 < 5.15.80, >= 5.16 < 6.0.10)에 포함되는지 확인합니다. OS를 선택하면 해당 OS의 제품·패키지·KB·APAR 확인 명령만 표시됩니다.
조치방안
구조화된 수정 버전 값(4.9.334, 4.14.300, 4.19.267, 5.4.225, 5.10.156, 5.15.80, 6.0.10)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 4.9.334, 4.14.300, 4.19.267, 5.4.225, 5.10.156, 5.15.80, 6.0.10 기준을 충족하는지 확인합니다. 이어서 유형 미확정 관련 오류·공격 흔적이 새로 발생하지 않는지 확인합니다.
