In the Linux kernel, the following vulnerability has been resolved: lwt: Fix return values of BPF xmit ops BPF encap ops can return different types of positive values, such like NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in ip(6)_finish_output2. When this happens, skbs that have been freed would continue to the neighbor subsystem, causing use-after-free bug and kernel crashes. To fix the incorrect behavior, skb_do_redirect return values...
In the Linux kernel, the following vulnerability has been resolved: lwt: Fix return values of BPF xmit ops BPF encap ops can return different types of positive values, such like NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in ip(6)_finish_output2. When this happens, skbs that have been freed would continue to the neighbor subsystem, causing use-after-free bug and kernel crashes. To fix the incorrect behavior, skb_do_redirect return values...
Linux Linux, linux kernel의 현재 전체 버전이 공식 영향 범위(Linux Linux, linux kernel >= 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 < 67f8f2bae8e7ac72e09def2b667e44704c4d1ee1, >= 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 < a97f221651fcdc891166e9bc270e3d9bfa5a0080, >= 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 < e3f647e4b642f9f6d32795a16f92c116c138d2af, >= 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 < 065d5f17096ec9161180e2c890afdff4dc6125f2, >= 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 < d68c17402442f5f494a2c3ebde5cb82f6aa9160a, >= 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 < 65583f9e070db7bece20710cfa2e3daeb0b831d9, >= 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 < 29b22badb7a84b783e3a4fffca16f7768fb31205, >= 4.10, >= 4.10 < 5.4.257, >= 5.5 < 5.10.195, >= 5.11 < 5.15.132, >= 5.16 < 6.1.53, >= 6.2 < 6.4.16, >= 6.5 < 6.5.3)에 포함되는지 확인합니다. OS를 선택하면 해당 OS의 제품·패키지·KB·APAR 확인 명령만 표시됩니다.
조치방안
구조화된 수정 버전 값(5.4.257, 5.10.195, 5.15.132, 6.1.53, 6.4.16, 6.5.3)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 5.4.257, 5.10.195, 5.15.132, 6.1.53, 6.4.16, 6.5.3 기준을 충족하는지 확인합니다. 이어서 메모리 손상 관련 오류·공격 흔적이 새로 발생하지 않는지 확인합니다.
