CVE-2024-43893serial: core: check uartclk for zero to avoid divide by zero
- 5.5MediumCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 83% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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
Timeline
ID reserved
By Linux
- 9 days later
· 9 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 83% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 55b2a5d331a6ceb1c4372945fdb77181265ba24f
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 52b138f1021113e593ee6ad258ce08fe90693a9e
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 9196e42a3b8eeff1707e6ef769112b4b6096be49
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < e13ba3fe5ee070f8a9dab60029d52b1f61da5051
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < e3ad503876283ac3fcca922a1bf243ef9eb0b0e2
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 68dc02f319b9ee54dc23caba742a5c754d1cccc8
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 6eabce6608d6f3440f4c03aa3d3ef50a47a3d193
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 4.19.320 – ≤ 4.19.*
- unaffected 5.4.282 – ≤ 5.4.*
- unaffected 5.10.224 – ≤ 5.10.*
- unaffected 5.15.165 – ≤ 5.15.*
- unaffected 6.1.105 – ≤ 6.1.*
- unaffected 6.6.46 – ≤ 6.6.*
- unaffected 6.10.5 – ≤ 6.10.*
- unaffected 6.11 – ≤ *
References
References13
- https://git.kernel.org/stable/c/3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba (opens in a new tab)
- https://git.kernel.org/stable/c/55b2a5d331a6ceb1c4372945fdb77181265ba24f (opens in a new tab)
- https://git.kernel.org/stable/c/52b138f1021113e593ee6ad258ce08fe90693a9e (opens in a new tab)
- https://git.kernel.org/stable/c/9196e42a3b8eeff1707e6ef769112b4b6096be49 (opens in a new tab)
- https://git.kernel.org/stable/c/e13ba3fe5ee070f8a9dab60029d52b1f61da5051 (opens in a new tab)
- https://git.kernel.org/stable/c/e3ad503876283ac3fcca922a1bf243ef9eb0b0e2 (opens in a new tab)
- https://git.kernel.org/stable/c/68dc02f319b9ee54dc23caba742a5c754d1cccc8 (opens in a new tab)
- https://git.kernel.org/stable/c/6eabce6608d6f3440f4c03aa3d3ef50a47a3d193 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-40543 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-43893)Record last updated .