CVSS: -EPSS: %CPEs: 8EXPL: 0CVE-2024-53057 – net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT
https://notcve.org/view.php?id=CVE-2024-53057
In the Linux kernel, the following vulnerability has been resolved: net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT In qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed to be either root or ingress. This assumption is bogus since it's valid to create egress qdiscs with major handle ffff: Budimir Markovic found that for qdiscs like DRR that maintain an active class list, it will cause a UAF with a dangling class pointer. In 066a3b5b2346, the concern was to avoid iterating over the ingress qdisc since its parent is itself. The proper fix is to stop when parent TC_H_ROOT is reached because the only way to retrieve ingress is when a hierarchy which does not contain a ffff: major handle call into qdisc_lookup with TC_H_MAJ(TC_H_ROOT). In the scenario where major ffff: is an egress qdisc in any of the tree levels, the updates will also propagate to TC_H_ROOT, which then the iteration must stop. net/sched/sch_api.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) • https://git.kernel.org/stable/c/066a3b5b2346febf9a655b444567b7138e3bb939 https://git.kernel.org/stable/c/e7f9a6f97eb067599a74f3bcb6761976b0ed303e https://git.kernel.org/stable/c/dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20 https://git.kernel.org/stable/c/ce691c814bc7a3c30c220ffb5b7422715458fd9b https://git.kernel.org/stable/c/05df1b1dff8f197f1c275b57ccb2ca33021df552 https://git.kernel.org/stable/c/580b3189c1972aff0f993837567d36392e9d981b https://git.kernel.org/stable/c/597cf9748c3477bf61bc35f0634129f56764ad24 https://git.kernel.org/stable/c/9995909615c3431a5304c1210face5f26 •
CVSS: -EPSS: %CPEs: 3EXPL: 0CVE-2024-53056 – drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy()
https://notcve.org/view.php?id=CVE-2024-53056
In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy() In mtk_crtc_create(), if the call to mbox_request_channel() fails then we set the "mtk_crtc->cmdq_client.chan" pointer to NULL. In that situation, we do not call cmdq_pkt_create(). During the cleanup, we need to check if the "mtk_crtc->cmdq_client.chan" is NULL first before calling cmdq_pkt_destroy(). Calling cmdq_pkt_destroy() is unnecessary if we didn't call cmdq_pkt_create() and it will result in a NULL pointer dereference. • https://git.kernel.org/stable/c/7627122fd1c06800a1fe624e9fb3c269796115e8 https://git.kernel.org/stable/c/2c4396693698e876e559768d3d3a150c672ec384 https://git.kernel.org/stable/c/c60583a87cb4a85b69d1f448f0be5eb6ec62cbb2 https://git.kernel.org/stable/c/4018651ba5c409034149f297d3dd3328b91561fd •
CVSS: -EPSS: %CPEs: 5EXPL: 0CVE-2024-53055 – wifi: iwlwifi: mvm: fix 6 GHz scan construction
https://notcve.org/view.php?id=CVE-2024-53055
In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mvm: fix 6 GHz scan construction If more than 255 colocated APs exist for the set of all APs found during 2.4/5 GHz scanning, then the 6 GHz scan construction will loop forever since the loop variable has type u8, which can never reach the number found when that's bigger than 255, and is stored in a u32 variable. Also move it into the loops to have a smaller scope. Using a u32 there is fine, we limit the number of APs in the scan list and each has a limit on the number of RNR entries due to the frame size. With a limit of 1000 scan results, a frame size upper bound of 4096 (really it's more like ~2300) and a TBTT entry size of at least 11, we get an upper bound for the number of ~372k, well in the bounds of a u32. • https://git.kernel.org/stable/c/eae94cf82d7456b57fa9fd55c1edb8a726dcc19c https://git.kernel.org/stable/c/2ac15e5a8f42fed5d90ed9e1197600913678c50f https://git.kernel.org/stable/c/cde8a7eb5c6762264ff0f4433358e0a0d250c875 https://git.kernel.org/stable/c/fc621e7a043de346c33bd7ae7e2e0c651d6152ef https://git.kernel.org/stable/c/2ccd5badadab2d586e91546bf5af3deda07fef1f https://git.kernel.org/stable/c/7245012f0f496162dd95d888ed2ceb5a35170f1a •
CVSS: -EPSS: %CPEs: 4EXPL: 0CVE-2024-53054 – cgroup/bpf: use a dedicated workqueue for cgroup bpf destruction
https://notcve.org/view.php?id=CVE-2024-53054
In the Linux kernel, the following vulnerability has been resolved: cgroup/bpf: use a dedicated workqueue for cgroup bpf destruction A hung_task problem shown below was found: INFO: task kworker/0:0:8 blocked for more than 327 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Workqueue: events cgroup_bpf_release Call Trace: <TASK> __schedule+0x5a2/0x2050 ? find_held_lock+0x33/0x100 ? wq_worker_sleeping+0x9e/0xe0 schedule+0x9f/0x180 schedule_preempt_disabled+0x25/0x50 __mutex_lock+0x512/0x740 ? cgroup_bpf_release+0x1e/0x4d0 ? cgroup_bpf_release+0xcf/0x4d0 ? • https://git.kernel.org/stable/c/4bfc0bb2c60e2f4cc8eb60f03cf8dfa72336272a https://git.kernel.org/stable/c/71f14a9f5c7db72fdbc56e667d4ed42a1a760494 https://git.kernel.org/stable/c/0d86cd70fc6a7ba18becb52ad8334d5ad3eca530 https://git.kernel.org/stable/c/6dab3331523ba73db1345d19e6f586dcd5f6efb4 https://git.kernel.org/stable/c/117932eea99b729ee5d12783601a4f7f5fd58a23 •
CVSS: -EPSS: %CPEs: 6EXPL: 0CVE-2024-53052 – io_uring/rw: fix missing NOWAIT check for O_DIRECT start write
https://notcve.org/view.php?id=CVE-2024-53052
In the Linux kernel, the following vulnerability has been resolved: io_uring/rw: fix missing NOWAIT check for O_DIRECT start write When io_uring starts a write, it'll call kiocb_start_write() to bump the super block rwsem, preventing any freezes from happening while that write is in-flight. The freeze side will grab that rwsem for writing, excluding any new writers from happening and waiting for existing writes to finish. But io_uring unconditionally uses kiocb_start_write(), which will block if someone is currently attempting to freeze the mount point. This causes a deadlock where freeze is waiting for previous writes to complete, but the previous writes cannot complete, as the task that is supposed to complete them is blocked waiting on starting a new write. This results in the following stuck trace showing that dependency with the write blocked starting a new write: task:fio state:D stack:0 pid:886 tgid:886 ppid:876 Call trace: __switch_to+0x1d8/0x348 __schedule+0x8e8/0x2248 schedule+0x110/0x3f0 percpu_rwsem_wait+0x1e8/0x3f8 __percpu_down_read+0xe8/0x500 io_write+0xbb8/0xff8 io_issue_sqe+0x10c/0x1020 io_submit_sqes+0x614/0x2110 __arm64_sys_io_uring_enter+0x524/0x1038 invoke_syscall+0x74/0x268 el0_svc_common.constprop.0+0x160/0x238 do_el0_svc+0x44/0x60 el0_svc+0x44/0xb0 el0t_64_sync_handler+0x118/0x128 el0t_64_sync+0x168/0x170 INFO: task fsfreeze:7364 blocked for more than 15 seconds. Not tainted 6.12.0-rc5-00063-g76aaf945701c #7963 with the attempting freezer stuck trying to grab the rwsem: task:fsfreeze state:D stack:0 pid:7364 tgid:7364 ppid:995 Call trace: __switch_to+0x1d8/0x348 __schedule+0x8e8/0x2248 schedule+0x110/0x3f0 percpu_down_write+0x2b0/0x680 freeze_super+0x248/0x8a8 do_vfs_ioctl+0x149c/0x1b18 __arm64_sys_ioctl+0xd0/0x1a0 invoke_syscall+0x74/0x268 el0_svc_common.constprop.0+0x160/0x238 do_el0_svc+0x44/0x60 el0_svc+0x44/0xb0 el0t_64_sync_handler+0x118/0x128 el0t_64_sync+0x168/0x170 Fix this by having the io_uring side honor IOCB_NOWAIT, and only attempt a blocking grab of the super block rwsem if it isn't set. For normal issue where IOCB_NOWAIT would always be set, this returns -EAGAIN which will have io_uring core issue a blocking attempt of the write. That will in turn also get completions run, ensuring forward progress. Since freezing requires CAP_SYS_ADMIN in the first place, this isn't something that can be triggered by a regular user. • https://git.kernel.org/stable/c/485d9232112b17f389b29497ff41b97b3189546b https://git.kernel.org/stable/c/4e24041ba86d50aaa4c792ae2c88ed01b3d96243 https://git.kernel.org/stable/c/9e8debb8e51354b201db494689198078ec2c1e75 https://git.kernel.org/stable/c/003d2996964c03dfd34860500428f4cdf1f5879e https://git.kernel.org/stable/c/26b8c48f369b7591f5679e0b90612f4862a32929 https://git.kernel.org/stable/c/1d60d74e852647255bd8e76f5a22dc42531e4389 •