In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-use condition in hfsc_change_class() when working with certain child qdiscs like netem or codel. The vulnerability works as follows: 1. hfsc_change_class() checks if a class has packets (q.qlen != 0) 2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g., codel, netem) might drop packets and empty the queue 3. The code continue...
In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-use condition in hfsc_change_class() when working with certain child qdiscs like netem or codel. The vulnerability works as follows: 1. hfsc_change_class() checks if a class has packets (q.qlen != 0) 2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g., codel, netem) might drop packets and empty the queue 3. The code continue...
Linux Linux, linux kernel, debian linux의 현재 전체 버전이 공식 영향 범위(Linux Linux, linux kernel, debian linux >= 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 < 28b09a067831f7317c3841812276022d6c940677, >= 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 < 39b9095dd3b55d9b2743df038c32138efa34a9de, >= 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 < fcc8ede663569c704fb00a702973bd6c00373283, >= 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 < 20d584a33e480ae80d105f43e0e7b56784da41b9, >= 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 < 3aa852e3605000d5c47035c3fc3a986d14ccfa9f, >= 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 < 86cd4641c713455a4f1c8e54c370c598c2b1cee0, >= 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 < bb583c88d23b72d8d16453d24856c99bd93dadf5, >= 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 < 3df275ef0a6ae181e8428a6589ef5d5231e58b5c, >= 4.14, >= 4.14.1 < 5.4.293, >= 5.5 < 5.10.237, >= 5.11 < 5.15.181, >= 5.16 < 6.1.136, >= 6.2 < 6.6.89, >= 6.7 < 6.12.26, >= 6.13 < 6.14.5, 4.14, 6.15, 11.0)에 포함되는지 확인합니다. OS를 선택하면 해당 OS의 제품·패키지·KB·APAR 확인 명령만 표시됩니다.
조치방안
제3자 참조와 수정 버전 값(5.4.293, 5.10.237, 5.15.181, 6.1.136, 6.6.89, 6.12.26, 6.14.5)은 보조 근거로만 사용하고, 공급사 공식 보안 권고에서 조치 기준을 재확인합니다.
조치 후 확인사항
패치 후 같은 명령으로 전체 버전을 다시 확인해 Linux Linux, linux kernel, debian linux 5.4.293, 5.10.237, 5.15.181, 6.1.136, 6.6.89, 6.12.26, 6.14.5 기준을 충족하는지 확인합니다. 이어서 메모리 손상 관련 오류·공격 흔적이 새로 발생하지 않는지 확인합니다.
