CVSS: -EPSS: 0%CPEs: 6EXPL: 0CVE-2024-46804 – drm/amd/display: Add array index check for hdcp ddc access
https://notcve.org/view.php?id=CVE-2024-46804
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Add array index check for hdcp ddc access [Why] Coverity reports OVERRUN warning. Do not check if array index valid. [How] Check msg_id valid and valid array index. • https://git.kernel.org/stable/c/2a63c90c7a90ab2bd23deebc2814fc5b52abf6d2 https://git.kernel.org/stable/c/0ee4387c5a4b57ec733c3fb4365188d5979cd9c7 https://git.kernel.org/stable/c/f338f99f6a04d03c802087d82a83561cbd5bdc99 https://git.kernel.org/stable/c/8b5ccf3d011969417be653b5a145c72dbd30472c https://git.kernel.org/stable/c/a3b5ee22a9d3a30045191da5678ca8451ebaea30 https://git.kernel.org/stable/c/4e70c0f5251c25885c31ee84a31f99a01f7cf50e •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2024-46803 – drm/amdkfd: Check debug trap enable before write dbg_ev_file
https://notcve.org/view.php?id=CVE-2024-46803
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Check debug trap enable before write dbg_ev_file In interrupt context, write dbg_ev_file will be run by work queue. It will cause write dbg_ev_file execution after debug_trap_disable, which will cause NULL pointer access. v2: cancel work "debug_event_workarea" before set dbg_ev_file as NULL. • https://git.kernel.org/stable/c/e6ea3b8fe398915338147fe54dd2db8155fdafd8 https://git.kernel.org/stable/c/820dcbd38a77bd5fdc4236d521c1c122841227d0 https://git.kernel.org/stable/c/547033b593063eb85bfdf9b25a5f1b8fd1911be2 •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2024-46802 – drm/amd/display: added NULL check at start of dc_validate_stream
https://notcve.org/view.php?id=CVE-2024-46802
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: added NULL check at start of dc_validate_stream [Why] prevent invalid memory access [How] check if dc and stream are NULL • https://git.kernel.org/stable/c/356fcce9cdbfe338a275e9e1836adfdd7f5c52a9 https://git.kernel.org/stable/c/154a50bf4221a6a6ccf88d565b8184da7c40a2dd https://git.kernel.org/stable/c/6bf920193ba1853bad780bba565a789246d9003c https://git.kernel.org/stable/c/26c56049cc4f1705b498df013949427692a4b0d5 •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2024-46800 – sch/netem: fix use after free in netem_dequeue
https://notcve.org/view.php?id=CVE-2024-46800
In the Linux kernel, the following vulnerability has been resolved: sch/netem: fix use after free in netem_dequeue If netem_dequeue() enqueues packet to inner qdisc and that qdisc returns __NET_XMIT_STOLEN. The packet is dropped but qdisc_tree_reduce_backlog() is not called to update the parent's q.qlen, leading to the similar use-after-free as Commit e04991a48dbaf382 ("netem: fix return value if duplicate enqueue fails") Commands to trigger KASAN UaF: ip link add type dummy ip link set lo up ip link set dummy0 up tc qdisc add dev lo parent root handle 1: drr tc filter add dev lo parent 1: basic classid 1:1 tc class add dev lo classid 1:1 drr tc qdisc add dev lo parent 1:1 handle 2: netem tc qdisc add dev lo parent 2: handle 3: drr tc filter add dev lo parent 3: basic classid 3:1 action mirred egress redirect dev dummy0 tc class add dev lo classid 3:1 drr ping -c1 -W0.01 localhost # Trigger bug tc class del dev lo classid 1:1 tc class add dev lo classid 1:1 drr ping -c1 -W0.01 localhost # UaF • https://git.kernel.org/stable/c/50612537e9ab29693122fab20fc1eed235054ffe https://git.kernel.org/stable/c/f0bddb4de043399f16d1969dad5ee5b984a64e7b https://git.kernel.org/stable/c/295ad5afd9efc5f67b86c64fce28fb94e26dc4c9 https://git.kernel.org/stable/c/98c75d76187944296068d685dfd8a1e9fd8c4fdc https://git.kernel.org/stable/c/14f91ab8d391f249b845916820a56f42cf747241 https://git.kernel.org/stable/c/db2c235682913a63054e741fe4e19645fdf2d68e https://git.kernel.org/stable/c/dde33a9d0b80aae0c69594d1f462515d7ff1cb3d https://git.kernel.org/stable/c/32008ab989ddcff1a485fa2b4906234c2 •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2024-46787 – userfaultfd: fix checks for huge PMDs
https://notcve.org/view.php?id=CVE-2024-46787
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix checks for huge PMDs Patch series "userfaultfd: fix races around pmd_trans_huge() check", v2. The pmd_trans_huge() code in mfill_atomic() is wrong in three different ways depending on kernel version: 1. The pmd_trans_huge() check is racy and can lead to a BUG_ON() (if you hit the right two race windows) - I've tested this in a kernel build with some extra mdelay() calls. See the commit message for a description of the race scenario. On older kernels (before 6.5), I think the same bug can even theoretically lead to accessing transhuge page contents as a page table if you hit the right 5 narrow race windows (I haven't tested this case). 2. As pointed out by Qi Zheng, pmd_trans_huge() is not sufficient for detecting PMDs that don't point to page tables. On older kernels (before 6.5), you'd just have to win a single fairly wide race to hit this. I've tested this on 6.1 stable by racing migration (with a mdelay() patched into try_to_migrate()) against UFFDIO_ZEROPAGE - on my x86 VM, that causes a kernel oops in ptlock_ptr(). 3. On newer kernels (>=6.5), for shmem mappings, khugepaged is allowed to yank page tables out from under us (though I haven't tested that), so I think the BUG_ON() checks in mfill_atomic() are just wrong. I decided to write two separate fixes for these (one fix for bugs 1+2, one fix for bug 3), so that the first fix can be backported to kernels affected by bugs 1+2. This patch (of 2): This fixes two issues. I discovered that the following race can occur: mfill_atomic other thread ============ ============ <zap PMD> pmdp_get_lockless() [reads none pmd] <bail if trans_huge> <if none:> <pagefault creates transhuge zeropage> __pte_alloc [no-op] <zap PMD> <bail if pmd_trans_huge(*dst_pmd)> BUG_ON(pmd_none(*dst_pmd)) I have experimentally verified this in a kernel with extra mdelay() calls; the BUG_ON(pmd_none(*dst_pmd)) triggers. On kernels newer than commit 0d940a9b270b ("mm/pgtable: allow pte_offset_map[_lock]() to fail"), this can't lead to anything worse than a BUG_ON(), since the page table access helpers are actually designed to deal with page tables concurrently disappearing; but on older kernels (<=6.4), I think we could probably theoretically race past the two BUG_ON() checks and end up treating a hugepage as a page table. The second issue is that, as Qi Zheng pointed out, there are other types of huge PMDs that pmd_trans_huge() can't catch: devmap PMDs and swap PMDs (in particular, migration PMDs). On <=6.4, this is worse than the first issue: If mfill_atomic() runs on a PMD that contains a migration entry (which just requires winning a single, fairly wide race), it will pass the PMD to pte_offset_map_lock(), which assumes that the PMD points to a page table. Breakage follows: First, the kernel tries to take the PTE lock (which will crash or maybe worse if there is no "struct page" for the address bits in the migration entry PMD - I think at least on X86 there usually is no corresponding "struct page" thanks to the PTE inversion mitigation, amd64 looks different). If that didn't crash, the kernel would next try to write a PTE into what it wrongly thinks is a page table. As part of fixing these issues, get rid of the check for pmd_trans_huge() before __pte_alloc() - that's redundant, we're going to have to check for that after the __pte_alloc() anyway. Backport note: pmdp_get_lockless() is pmd_read_atomic() in older kernels. • https://git.kernel.org/stable/c/c1a4de99fada21e2e9251e52cbb51eff5aadc757 https://git.kernel.org/stable/c/3c6b4bcf37845c9359aed926324bed66bdd2448d https://git.kernel.org/stable/c/98cc18b1b71e23fe81a5194ed432b20c2d81a01a https://git.kernel.org/stable/c/71c186efc1b2cf1aeabfeff3b9bd5ac4c5ac14d8 •