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CVE-2024-50072
published 2024-10-29

CVE-2024-50072: In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Use code segment selector for VERW operand Robert Gill reported below #GP in…

PriorityP424medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.23%
14.1th percentile
In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Use code segment selector for VERW operand Robert Gill reported below #GP in 32-bit mode when dosemu software was executing vm86() system call: general protection fault: 0000 [#1] PREEMPT SMP CPU: 4 PID: 4610 Comm: dosemu.bin Not tainted 6.6.21-gentoo-x86 #1 Hardware name: Dell Inc. PowerEdge 1950/0H723K, BIOS 2.7.0 10/30/2010 EIP: restore_all_switch_stack+0xbe/0xcf EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 ESI: 00000000 EDI: 00000000 EBP: 00000000 ESP: ff8affdc DS: 0000 ES: 0000 FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010046 CR0: 80050033 CR2: 00c2101c CR3: 04b6d000 CR4: 000406d0 Call Trace: show_regs+0x70/0x78 die_addr+0x29/0x70 exc_general_protection+0x13c/0x348 exc_bounds+0x98/0x98 handle_exception+0x14d/0x14d exc_bounds+0x98/0x98 restore_all_switch_stack+0xbe/0xcf exc_bounds+0x98/0x98 restore_all_switch_stack+0xbe/0xcf This only happens in 32-bit mode when VERW based mitigations like MDS/RFDS are enabled. This is because segment registers with an arbitrary user value can result in #GP when executing VERW. Intel SDM vol. 2C documents the following behavior for VERW instruction: #GP(0) - If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit. CLEAR_CPU_BUFFERS macro executes VERW instruction before returning to user space. Use %cs selector to reference VERW operand. This ensures VERW will not #GP for an arbitrary user %ds. [ mingo: Fixed the SOB chain. ]

Affected

33 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.119-1 (bookworm)linux 6.1.119-1 (bookworm)
debianlinux-6.1< linux 6.1.119-1 (bookworm)linux 6.1.119-1 (bookworm)
linuxlinux
linuxlinux
linuxlinux>= 2e3087505ddb8ba2d3d4c81306cca11e868fcdb9 < 38c5fe74f3bef98f75d16effa49836d50c9b609738c5fe74f3bef98f75d16effa49836d50c9b6097
linuxlinux>= 5.10.215 < 5.10.2295.10.229
linuxlinux>= 5.15.154 < 5.15.1715.15.171
linuxlinux>= 50f021f0b985629accf10481a6e89af8b9700583 < bfd1d223d80cb29a210caa1bd5e21f0816d58f02bfd1d223d80cb29a210caa1bd5e21f0816d58f02
linuxlinux>= 6.1.81 < 6.1.1166.1.116
linuxlinux>= 6.6.21 < 6.6.586.6.58
linuxlinux>= 6.7.9 < 6.86.8
linuxlinux>= a0e2dab44d22b913b4c228c8b52b2a104434b0b3 < bc576fbaf82deded606e69a00efe9752136bf91dbc576fbaf82deded606e69a00efe9752136bf91d
linuxlinux>= a0e2dab44d22b913b4c228c8b52b2a104434b0b3 < e4d2102018542e3ae5e297bc6e229303abff8a0fe4d2102018542e3ae5e297bc6e229303abff8a0f
linuxlinux>= ca13d8cd8dac25558da4ee8df4dc70e8e7f9d762 < 481b477ab63c7245715a3e57ba79eb87c2dc0d02481b477ab63c7245715a3e57ba79eb87c2dc0d02
linuxlinux>= d54de9f2a127090f2017184e8257795b487d5312 < ada431c6c31a2c8c37991c46089af5caa23a9c6eada431c6c31a2c8c37991c46089af5caa23a9c6e
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.234-15.10.234-1
linuxlinux_kernel>= 0 < 6.1.119-16.1.119-1
linuxlinux_kernel>= 0 < 6.11.5-16.11.5-1
linuxlinux_kernel>= 0 < 6.11.5-16.11.5-1
linuxlinux_kernel>= 0 < 5.15.0-133.1445.15.0-133.144
linuxlinux_kernel>= 0 < 6.8.0-56.586.8.0-56.58
linuxlinux_kernel>= 0 < 6.11.0-18.186.11.0-18.18
linuxlinux_kernel>= 5.10.215 < 5.115.11
linuxlinux_kernel>= 5.15.154 < 5.165.16

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian5.5MEDIUM
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
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