CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2022-48991 – mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths
https://notcve.org/view.php?id=CVE-2022-48991
In the Linux kernel, the following vulnerability has been resolved: mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths Any codepath that zaps page table entries must invoke MMU notifiers to ensure that secondary MMUs (like KVM) don't keep accessing pages which aren't mapped anymore. Secondary MMUs don't hold their own references to pages that are mirrored over, so failing to notify them can lead to page use-after-free. I'm marking this as addressing an issue introduced in commit f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages"), but most of the security impact of this only came in commit 27e1f8273113 ("khugepaged: enable collapse pmd for pte-mapped THP"), which actually omitted flushes for the removal of present PTEs, not just for the removal of empty page tables. khugepaged in Linux races with rmap-based zap, races with GUP-fast, and fails to call MMU notifiers. • https://git.kernel.org/stable/c/f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19 https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3 https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69 https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596 https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3 https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2022-48990 – drm/amdgpu: fix use-after-free during gpu recovery
https://notcve.org/view.php?id=CVE-2022-48990
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix use-after-free during gpu recovery [Why] [ 754.862560] refcount_t: underflow; use-after-free. [ 754.862898] Call Trace: [ 754.862903] <TASK> [ 754.862913] amdgpu_job_free_cb+0xc2/0xe1 [amdgpu] [ 754.863543] drm_sched_main.cold+0x34/0x39 [amd_sched] [How] The fw_fence may be not init, check whether dma_fence_init is performed before job free • https://git.kernel.org/stable/c/d2a89cd942edd50c1e652004fd64019be78b0a96 https://git.kernel.org/stable/c/3cb93f390453cde4d6afda1587aaa00e75e09617 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2022-48989 – fscache: Fix oops due to race with cookie_lru and use_cookie
https://notcve.org/view.php?id=CVE-2022-48989
In the Linux kernel, the following vulnerability has been resolved: fscache: Fix oops due to race with cookie_lru and use_cookie If a cookie expires from the LRU and the LRU_DISCARD flag is set, but the state machine has not run yet, it's possible another thread can call fscache_use_cookie and begin to use it. When the cookie_worker finally runs, it will see the LRU_DISCARD flag set, transition the cookie->state to LRU_DISCARDING, which will then withdraw the cookie. Once the cookie is withdrawn the object is removed the below oops will occur because the object associated with the cookie is now NULL. Fix the oops by clearing the LRU_DISCARD bit if another thread uses the cookie before the cookie_worker runs. BUG: kernel NULL pointer dereference, address: 0000000000000008 ... CPU: 31 PID: 44773 Comm: kworker/u130:1 Tainted: G E 6.0.0-5.dneg.x86_64 #1 Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Workqueue: events_unbound netfs_rreq_write_to_cache_work [netfs] RIP: 0010:cachefiles_prepare_write+0x28/0x90 [cachefiles] ... Call Trace: netfs_rreq_write_to_cache_work+0x11c/0x320 [netfs] process_one_work+0x217/0x3e0 worker_thread+0x4a/0x3b0 kthread+0xd6/0x100 • https://git.kernel.org/stable/c/12bb21a29c19aae50cfad4e2bb5c943108f34a7d https://git.kernel.org/stable/c/37f0b459c9b67e14fe4dcc3a15d286c4436ed01d https://git.kernel.org/stable/c/b5b52de3214a29911f949459a79f6640969b5487 •
CVSS: -EPSS: 0%CPEs: 7EXPL: 0CVE-2022-48988 – memcg: fix possible use-after-free in memcg_write_event_control()
https://notcve.org/view.php?id=CVE-2022-48988
In the Linux kernel, the following vulnerability has been resolved: memcg: fix possible use-after-free in memcg_write_event_control() memcg_write_event_control() accesses the dentry->d_name of the specified control fd to route the write call. As a cgroup interface file can't be renamed, it's safe to access d_name as long as the specified file is a regular cgroup file. Also, as these cgroup interface files can't be removed before the directory, it's safe to access the parent too. Prior to 347c4a874710 ("memcg: remove cgroup_event->cft"), there was a call to __file_cft() which verified that the specified file is a regular cgroupfs file before further accesses. The cftype pointer returned from __file_cft() was no longer necessary and the commit inadvertently dropped the file type check with it allowing any file to slip through. With the invarients broken, the d_name and parent accesses can now race against renames and removals of arbitrary files and cause use-after-free's. Fix the bug by resurrecting the file type check in __file_cft(). • https://git.kernel.org/stable/c/347c4a8747104a945ecced358944e42879176ca5 https://git.kernel.org/stable/c/b77600e26fd48727a95ffd50ba1e937efb548125 https://git.kernel.org/stable/c/e1ae97624ecf400ea56c238bff23e5cd139df0b8 https://git.kernel.org/stable/c/35963b31821920908e397146502066f6b032c917 https://git.kernel.org/stable/c/f1f7f36cf682fa59db15e2089039a2eeb58ff2ad https://git.kernel.org/stable/c/aad8bbd17a1d586005feb9226c2e9cfce1432e13 https://git.kernel.org/stable/c/0ed074317b835caa6c03bcfa8f133365324673dc https://git.kernel.org/stable/c/4a7ba45b1a435e7097ca0f79a847d0949 •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2022-48986 – mm/gup: fix gup_pud_range() for dax
https://notcve.org/view.php?id=CVE-2022-48986
In the Linux kernel, the following vulnerability has been resolved: mm/gup: fix gup_pud_range() for dax For dax pud, pud_huge() returns true on x86. So the function works as long as hugetlb is configured. However, dax doesn't depend on hugetlb. Commit 414fd080d125 ("mm/gup: fix gup_pmd_range() for dax") fixed devmap-backed huge PMDs, but missed devmap-backed huge PUDs. Fix this as well. This fixes the below kernel panic: general protection fault, probably for non-canonical address 0x69e7c000cc478: 0000 [#1] SMP < snip > Call Trace: <TASK> get_user_pages_fast+0x1f/0x40 iov_iter_get_pages+0xc6/0x3b0 ? mempool_alloc+0x5d/0x170 bio_iov_iter_get_pages+0x82/0x4e0 ? • https://git.kernel.org/stable/c/414fd080d125408cb15d04ff4907e1dd8145c8c7 https://git.kernel.org/stable/c/c133d8eb894cb280f331608c6f1962ba9fbfe6b0 https://git.kernel.org/stable/c/538162d21ac877b060dc057c89f13718f5caffc5 https://git.kernel.org/stable/c/8b1a7762e0dac5db42a003009fdcb425f10baa07 https://git.kernel.org/stable/c/04edfa3dc06ecfc6133a33bc7271298782dee875 https://git.kernel.org/stable/c/f1cf856123ceb766c49967ec79b841030fa1741f https://git.kernel.org/stable/c/3ac29732a2ffa64c7de13a072b0f2848b9c11037 https://git.kernel.org/stable/c/e06d13c36ded750c72521b600293befeb •