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CVE-2024-50072— x86/bugs: Use code segment selector for VERW operand

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在使用VERW指令时未正确使用代码段选择器，导致在执行vm86系统调用时出现一般保护性故障。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.23% · P13

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 50f021f0b985629accf10481a6e89af8b9700583< bfd1d223d80cb29a210caa1bd5e21f0816d58f02 affected
d54de9f2a127090f2017184e8257795b487d5312< ada431c6c31a2c8c37991c46089af5caa23a9c6e affected
2e3087505ddb8ba2d3d4c81306cca11e868fcdb9< 38c5fe74f3bef98f75d16effa49836d50c9b6097 affected
ca13d8cd8dac25558da4ee8df4dc70e8e7f9d762< 481b477ab63c7245715a3e57ba79eb87c2dc0d02 affected
a0e2dab44d22b913b4c228c8b52b2a104434b0b3< bc576fbaf82deded606e69a00efe9752136bf91d affected
a0e2dab44d22b913b4c228c8b52b2a104434b0b3< e4d2102018542e3ae5e297bc6e229303abff8a0f affected
51eca9f1fd047b500137d021f882d93f03280118 affected
5.10.215< 5.10.229 affected
… +12 more rows
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I. Basic Information for CVE-2024-50072

Vulnerability Information
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Vulnerability Title
x86/bugs: Use code segment selector for VERW operand
Source: CVE Program / CVE List V5
Vulnerability Description
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. ]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在使用VERW指令时未正确使用代码段选择器，导致在执行vm86系统调用时出现一般保护性故障。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 50f021f0b985629accf10481a6e89af8b9700583 ~ bfd1d223d80cb29a210caa1bd5e21f0816d58f02 -
Linux Linux 6.8 -

II. Public POCs for CVE-2024-50072

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III. Intelligence Information for CVE-2024-50072

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Patches & Fixes for CVE-2024-50072 (1)

Same Patch Batch · Linux · 2024-10-29 · 21 CVEs total

CVE-2024-50086 9.8 CRITICAL ksmbd: fix user-after-free from session log off
CVE-2024-50085 9.8 CRITICAL mptcp: pm: fix UaF read in mptcp_pm_nl_rm_addr_or_subflow
CVE-2024-50075 8.0 HIGH xhci: tegra: fix checked USB2 port number
CVE-2024-50087 7.8 HIGH btrfs: fix uninitialized pointer free on read_alloc_one_name() error
CVE-2024-50073 7.8 HIGH tty: n_gsm: Fix use-after-free in gsm_cleanup_mux
CVE-2024-50074 7.8 HIGH parport: Proper fix for array out-of-bounds access
CVE-2024-50077 7.8 HIGH Bluetooth: ISO: Fix multiple init when debugfs is disabled
CVE-2024-50078 7.8 HIGH Bluetooth: Call iso_exit() on module unload
CVE-2024-50082 7.8 HIGH blk-rq-qos: fix crash on rq_qos_wait vs. rq_qos_wake_function race
CVE-2024-50088 7.8 HIGH btrfs: fix uninitialized pointer free in add_inode_ref()
CVE-2024-50080 ublk: don't allow user copy for unprivileged device
CVE-2024-50079 io_uring/sqpoll: ensure task state is TASK_RUNNING when running task_work
CVE-2024-50081 blk-mq: setup queue ->tag_set before initializing hctx
CVE-2024-50076 vt: prevent kernel-infoleak in con_font_get()
CVE-2024-50083 tcp: fix mptcp DSS corruption due to large pmtu xmit
CVE-2024-50084 net: microchip: vcap api: Fix memory leaks in vcap_api_encode_rule_test()
CVE-2024-50071 pinctrl: nuvoton: fix a double free in ma35_pinctrl_dt_node_to_map_func()
CVE-2024-50070 pinctrl: stm32: check devm_kasprintf() returned value
CVE-2024-50069 pinctrl: apple: check devm_kasprintf() returned value
CVE-2024-50068 mm/damon/tests/sysfs-kunit.h: fix memory leak in damon_sysfs_test_add_targets()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-50072

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