CVE-2025-39883

Description

In the Linux kernel, the following vulnerability has been resolved:mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memoryWhen I did memory failure tests, below panic occurs:page dumped because: VM_BUG_ON_PAGE(PagePoisoned(page))kernel BUG at include/linux/page-flags.h:616!Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTICPU: 3 PID: 720 Comm: bash Not tainted 6.10.0-rc1-00195-g148743902568 #40RIP: 0010:unpoison_memory+0x2f3/0x590RSP: 0018:ffffa57fc8787d60 EFLAGS: 00000246RAX: 0000000000000037 RBX: 0000000000000009 RCX: ffff9be25fcdc9c8RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff9be25fcdc9c0RBP: 0000000000300000 R08: ffffffffb4956f88 R09: 0000000000009ffbR10: 0000000000000284 R11: ffffffffb4926fa0 R12: ffffe6b00c000000R13: ffff9bdb453dfd00 R14: 0000000000000000 R15: fffffffffffffffeFS: 00007f08f04e4740(0000) GS:ffff9be25fcc0000(0000) knlGS:0000000000000000CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 0000564787a30410 CR3: 000000010d4e2000 CR4: 00000000000006f0Call Trace: unpoison_memory+0x2f3/0x590 simple_attr_write_xsigned.constprop.0.isra.0+0xb3/0x110 debugfs_attr_write+0x42/0x60 full_proxy_write+0x5b/0x80 vfs_write+0xd5/0x540 ksys_write+0x64/0xe0 do_syscall_64+0xb9/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7fRIP: 0033:0x7f08f0314887RSP: 002b:00007ffece710078 EFLAGS: 00000246 ORIG_RAX: 0000000000000001RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f08f0314887RDX: 0000000000000009 RSI: 0000564787a30410 RDI: 0000000000000001RBP: 0000564787a30410 R08: 000000000000fefe R09: 000000007fffffffR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009R13: 00007f08f041b780 R14: 00007f08f0417600 R15: 00007f08f0416a00 Modules linked in: hwpoison_inject---[ end trace 0000000000000000 ]---RIP: 0010:unpoison_memory+0x2f3/0x590RSP: 0018:ffffa57fc8787d60 EFLAGS: 00000246RAX: 0000000000000037 RBX: 0000000000000009 RCX: ffff9be25fcdc9c8RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff9be25fcdc9c0RBP: 0000000000300000 R08: ffffffffb4956f88 R09: 0000000000009ffbR10: 0000000000000284 R11: ffffffffb4926fa0 R12: ffffe6b00c000000R13: ffff9bdb453dfd00 R14: 0000000000000000 R15: fffffffffffffffeFS: 00007f08f04e4740(0000) GS:ffff9be25fcc0000(0000) knlGS:0000000000000000CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 0000564787a30410 CR3: 000000010d4e2000 CR4: 00000000000006f0Kernel panic - not syncing: Fatal exceptionKernel Offset: 0x31c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)---[ end Kernel panic - not syncing: Fatal exception ]---The root cause is that unpoison_memory() tries to check the PG_HWPoisonflags of an uninitialized page. So VM_BUG_ON_PAGE(PagePoisoned(page)) istriggered. This can be reproduced by below steps:1.Offline memory block: echo offline > /sys/devices/system/memory/memory12/state2.Get offlined memory pfn: page-types -b n -rlN3.Write pfn to unpoison-pfn echo > /sys/kernel/debug/hwpoison/unpoison-pfnThis scenario can be identified by pfn_to_online_page() returning null. And ZONE_DEVICE pages are never expected, so we can simply fail ifpfn_to_online_page() == null to fix the bug.

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234