CVE-2026-23359 (GCVE-0-2026-23359)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-05-11 22:05
VLAI
Title
bpf: Fix stack-out-of-bounds write in devmap
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stack-out-of-bounds write in devmap get_upper_ifindexes() iterates over all upper devices and writes their indices into an array without checking bounds. Also the callers assume that the max number of upper devices is MAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack, but that assumption is not correct and the number of upper devices could be larger than MAX_NEST_DEV (e.g., many macvlans), causing a stack-out-of-bounds write. Add a max parameter to get_upper_ifindexes() to avoid the issue. When there are too many upper devices, return -EOVERFLOW and abort the redirect. To reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with an XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS. Then send a packet to the device to trigger the XDP redirect path.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: aeea1b86f9363f3feabb496534d886f082a89f21 , < 88df604f0d16a692867582350ce3f2fcd22243f1 (git)
Affected: aeea1b86f9363f3feabb496534d886f082a89f21 , < 5000e40acc8d0c36ab709662e32120986ac22e7e (git)
Affected: aeea1b86f9363f3feabb496534d886f082a89f21 , < 8a95fb9df1105b1618872c2846a6c01e3ba20b45 (git)
Affected: aeea1b86f9363f3feabb496534d886f082a89f21 , < d2c31d8e03d05edc16656e5ffe187f0d1da763d7 (git)
Affected: aeea1b86f9363f3feabb496534d886f082a89f21 , < 75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2 (git)
Affected: aeea1b86f9363f3feabb496534d886f082a89f21 , < ca831567908fd3f73cf97d8a6c09a5054697a182 (git)
Affected: aeea1b86f9363f3feabb496534d886f082a89f21 , < b7bf516c3ecd9a2aae2dc2635178ab87b734fef1 (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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the\\nredirect.\\n\\nTo reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with\\nan XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS.\\nThen send a packet to the device to trigger the XDP redirect path.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nbpf: Correcci\u00f3n de escritura fuera de l\u00edmites de la pila en devmap\\n\\nget_upper_ifindexes() itera sobre todos los dispositivos superiores y escribe sus \u00edndices en un array sin comprobar los l\u00edmites.\\n\\nAdem\u00e1s, los llamadores asumen que el n\u00famero m\u00e1ximo de dispositivos superiores es MAX_NEST_DEV y asignan excluded_devices[1+MAX_NEST_DEV] en la pila, pero esa suposici\u00f3n no es correcta y el n\u00famero de dispositivos superiores podr\u00eda ser mayor que MAX_NEST_DEV (por ejemplo, muchas macvlans), causando una escritura fuera de l\u00edmites de la pila.\\n\\nA\u00f1adir un par\u00e1metro max a get_upper_ifindexes() para evitar el problema.\\nCuando hay demasiados dispositivos superiores, devolver -EOVERFLOW y abortar la redirecci\u00f3n.\\n\\nPara reproducir, crear m\u00e1s de MAX_NEST_DEV(8) macvlans en un dispositivo con un programa XDP adjunto usando BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS.\\nLuego enviar un paquete al dispositivo para activar la ruta de redirecci\u00f3n 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.