CVE-2024-49977
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: stmmac: Fix zero-division error when disabling tc cbs
The commit b8c43360f6e4 ("net: stmmac: No need to calculate speed divider when offload is disabled") allows the "port_transmit_rate_kbps" to be set to a value of 0, which is then passed to the "div_s64" function when tc-cbs is disabled. This leads to a zero-division error.
When tc-cbs is disabled, the idleslope, sendslope, and credit values the credit values are not required to be configured. Therefore, adding a return statement after setting the txQ mode to DCB when tc-cbs is disabled would prevent a zero-division error.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.25%
- Percentil entre todas las CVEs puntuadas: 15
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-369
Referencias
- https://git.kernel.org/stable/c/03582f4752427f60817d896f1a827aff772bd31e
- https://git.kernel.org/stable/c/5d43e1ad4567d67af2b42d3ab7c14152ffed25c6
- https://git.kernel.org/stable/c/675faf5a14c14a2be0b870db30a70764df81e2df
- https://git.kernel.org/stable/c/837d9df9c0792902710149d1a5e0991520af0f93
- https://git.kernel.org/stable/c/b0da9504a528f05f97d926b4db74ff21917a33e9
- https://git.kernel.org/stable/c/e297a2bf56d12fd7f91a0c209eb6ea84361f3368
- https://git.kernel.org/stable/c/e33fe25b1efe4f2e6a5858786dbc82ae4c44ed4c
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: Fix zero-division error when disabling tc cbs\n\nThe commit b8c43360f6e4 (\"net: stmmac: No need to calculate speed divider\nwhen offload is disabled\") allows the \"port_transmit_rate_kbps\" to be\nset to a value of 0, which is then passed to the \"div_s64\" function when\ntc-cbs is disabled. This leads to a zero-division error.\n\nWhen tc-cbs is disabled, the idleslope, sendslope, and credit values the\ncredit values are not required to be configured. Therefore, adding a return\nstatement after setting the txQ mode to DCB when tc-cbs is disabled would\nprevent a zero-division error."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: stmmac: Fix zero-division error when disabling tc cbs el commit b8c43360f6e4 (\"net: stmmac: No need to calculate speed divider when offload is disabled\") permite que \"port_transmit_rate_kbps\" se establezca en un valor de 0, que luego se pasa a la función \"div_s64\" cuando tc-cbs está deshabilitado. Esto conduce a un error de división por cero. Cuando tc-cbs está deshabilitado, no es necesario configurar los valores idleslope, sendslope y credit. Por lo tanto, agregar una declaración de retorno después de establecer el modo txQ en DCB cuando tc-cbs está deshabilitado evitaría un error de división por cero."
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