248 lines
13 KiB
JSON
248 lines
13 KiB
JSON
{
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"cveId": "CVE-2022-48726",
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"state": "PUBLISHED",
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"dateReserved": "2024-06-20T11:09:39.051Z",
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"datePublished": "2024-06-20T11:13:15.957Z",
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{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ucma: Protect mc during concurrent multicast leaves\n\nPartially revert the commit mentioned in the Fixes line to make sure that\nallocation and erasing multicast struct are locked.\n\n BUG: KASAN: use-after-free in ucma_cleanup_multicast drivers/infiniband/core/ucma.c:491 [inline]\n BUG: KASAN: use-after-free in ucma_destroy_private_ctx+0x914/0xb70 drivers/infiniband/core/ucma.c:579\n Read of size 8 at addr ffff88801bb74b00 by task syz-executor.1/25529\n CPU: 0 PID: 25529 Comm: syz-executor.1 Not tainted 5.16.0-rc7-syzkaller #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n Call Trace:\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247\n __kasan_report mm/kasan/report.c:433 [inline]\n kasan_report.cold+0x83/0xdf mm/kasan/report.c:450\n ucma_cleanup_multicast drivers/infiniband/core/ucma.c:491 [inline]\n ucma_destroy_private_ctx+0x914/0xb70 drivers/infiniband/core/ucma.c:579\n ucma_destroy_id+0x1e6/0x280 drivers/infiniband/core/ucma.c:614\n ucma_write+0x25c/0x350 drivers/infiniband/core/ucma.c:1732\n vfs_write+0x28e/0xae0 fs/read_write.c:588\n ksys_write+0x1ee/0x250 fs/read_write.c:643\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nCurrently the xarray search can touch a concurrently freeing mc as the\nxa_for_each() is not surrounded by any lock. Rather than hold the lock for\na full scan hold it only for the effected items, which is usually an empty\nlist."
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"value": "AV:L - The bug is reached by write() commands to the local misc device /dev/infiniband/rdma_cm (ucma_write → JOIN_MCAST/LEAVE_MCAST/DESTROY_ID), not by remote packet processing.\nAC:L - The attacker fully controls both sides of the race by issuing concurrent leave/destroy/close operations on their own multicast contexts against the unlocked global multicast_table xa_for_each walk.\nPR:L - ucma registers rdma_cm with mode 0666 and performs no capability checks on the command path, so an unprivileged local user on an RDMA-capable system (RoCE/IB/soft-RoCE) can open the device and trigger the bug.\nUI:N - Exploitation requires only the attacker’s own syscalls against rdma_cm; no victim action is needed.\nS:U - This is a standard in-kernel UAF privilege-escalation class bug within the host kernel authority, with no VM/IOMMU/sandbox boundary crossed.\nC:H - The race is a confirmed use-after-free of ucma_multicast (KASAN read of mc->ctx), which per UAF guidance enables attacker-controlled reuse and arbitrary read primitives.\nI:H - UAF of the multicast object allows heap spray/reuse and can lead to double-free or corrupted control data when cleanup continues to xa_erase/kfree a reused object, enabling write/control-flow hijacking.\nA:H - The UAF reliably produces kernel oops/KASAN crashes (as shown by syzbot), so availability impact is high even without full exploitation."
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