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CVE-2024-43893— serial: core: check uartclk for zero to avoid divide by zero

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uart_get_divisor函数中存在除以零的问题。

AI Predicted 7.8 Difficulty: Easy EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 55b2a5d331a6ceb1c4372945fdb77181265ba24f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 52b138f1021113e593ee6ad258ce08fe90693a9e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9196e42a3b8eeff1707e6ef769112b4b6096be49 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e13ba3fe5ee070f8a9dab60029d52b1f61da5051 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e3ad503876283ac3fcca922a1bf243ef9eb0b0e2 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 68dc02f319b9ee54dc23caba742a5c754d1cccc8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6eabce6608d6f3440f4c03aa3d3ef50a47a3d193 affected
… +10 more rows
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I. Basic Information for CVE-2024-43893

Vulnerability Information
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Vulnerability Title
serial: core: check uartclk for zero to avoid divide by zero
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: serial: core: check uartclk for zero to avoid divide by zero Calling ioctl TIOCSSERIAL with an invalid baud_base can result in uartclk being zero, which will result in a divide by zero error in uart_get_divisor(). The check for uartclk being zero in uart_set_info() needs to be done before other settings are made as subsequent calls to ioctl TIOCSSERIAL for the same port would be impacted if the uartclk check was done where uartclk gets set. Oops: divide error: 0000 PREEMPT SMP KASAN PTI RIP: 0010:uart_get_divisor (drivers/tty/serial/serial_core.c:580) Call Trace: <TASK> serial8250_get_divisor (drivers/tty/serial/8250/8250_port.c:2576 drivers/tty/serial/8250/8250_port.c:2589) serial8250_do_set_termios (drivers/tty/serial/8250/8250_port.c:502 drivers/tty/serial/8250/8250_port.c:2741) serial8250_set_termios (drivers/tty/serial/8250/8250_port.c:2862) uart_change_line_settings (./include/linux/spinlock.h:376 ./include/linux/serial_core.h:608 drivers/tty/serial/serial_core.c:222) uart_port_startup (drivers/tty/serial/serial_core.c:342) uart_startup (drivers/tty/serial/serial_core.c:368) uart_set_info (drivers/tty/serial/serial_core.c:1034) uart_set_info_user (drivers/tty/serial/serial_core.c:1059) tty_set_serial (drivers/tty/tty_io.c:2637) tty_ioctl (drivers/tty/tty_io.c:2647 drivers/tty/tty_io.c:2791) __x64_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:907 fs/ioctl.c:893 fs/ioctl.c:893) do_syscall_64 (arch/x86/entry/common.c:52 (discriminator 1) arch/x86/entry/common.c:83 (discriminator 1)) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Rule: add
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uart_get_divisor函数中存在除以零的问题。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2024-43893

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III. Intelligence Information for CVE-2024-43893

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Other References for CVE-2024-43893 (8)

Same Patch Batch · Linux · 2024-08-26 · 39 CVEs total

CVE-2024-44942 7.8 HIGH f2fs: fix to do sanity check on F2FS_INLINE_DATA flag in inode during GC
CVE-2024-43910 7.8 HIGH bpf: add missing check_func_arg_reg_off() to prevent out-of-bounds memory accesses
CVE-2024-44934 7.8 HIGH net: bridge: mcast: wait for previous gc cycles when removing port
CVE-2024-43897 7.8 HIGH net: drop bad gso csum_start and offset in virtio_net_hdr
CVE-2024-43892 7.8 HIGH memcg: protect concurrent access to mem_cgroup_idr
CVE-2024-43891 7.8 HIGH tracing: Have format file honor EVENT_FILE_FL_FREED
CVE-2024-44939 7.8 HIGH jfs: fix null ptr deref in dtInsertEntry
CVE-2024-43888 7.8 HIGH mm: list_lru: fix UAF for memory cgroup
CVE-2024-44941 7.8 HIGH f2fs: fix to cover read extent cache access with lock
CVE-2024-44940 7.5 HIGH fou: remove warn in gue_gro_receive on unsupported protocol
CVE-2024-44933 7.3 HIGH bnxt_en : Fix memory out-of-bounds in bnxt_fill_hw_rss_tbl()
CVE-2024-43913 7.0 HIGH nvme: apple: fix device reference counting
CVE-2024-44938 jfs: Fix shift-out-of-bounds in dbDiscardAG
CVE-2024-44937 platform/x86: intel-vbtn: Protect ACPI notify handler against recursion
CVE-2024-44936 power: supply: rt5033: Bring back i2c_set_clientdata
CVE-2024-44935 sctp: Fix null-ptr-deref in reuseport_add_sock().
CVE-2024-44932 idpf: fix UAFs when destroying the queues
CVE-2024-44931 gpio: prevent potential speculation leaks in gpio_device_get_desc()
CVE-2024-43914 md/raid5: avoid BUG_ON() while continue reshape after reassembling
CVE-2024-43912 wifi: nl80211: disallow setting special AP channel widths

Showing top 20 of 39 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-43893

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