CVE-2026-23359

Advisory lineage Upstream: 0 Downstream: 5
Analyzed
Published: 25 Mar 2026, 10:27
Last modified:11 May 2026, 22:05

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.13% LOW
0% probability +0.11%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Mar 2026, 10:27
Published
Vulnerability first disclosed
11 May 2026, 22:05
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.13%• Percentile: 3%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ aeea1b86f9363f3feabb496534d886f082a89f21, < 88df604f0d16a692867582350ce3f2fcd22243f1 | ≥ aeea1b86f9363f3feabb496534d886f082a89f21, < 5000e40acc8d0c36ab709662e32120986ac22e7e | ≥ aeea1b86f9363f3feabb496534d886f082a89f21, < 8a95fb9df1105b1618872c2846a6c01e3ba20b45 | ≥ aeea1b86f9363f3feabb496534d886f082a89f21, < d2c31d8e03d05edc16656e5ffe187f0d1da763d7 | ≥ aeea1b86f9363f3feabb496534d886f082a89f21, < 75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2 | ≥ aeea1b86f9363f3feabb496534d886f082a89f21, < ca831567908fd3f73cf97d8a6c09a5054697a182 | ≥ aeea1b86f9363f3feabb496534d886f082a89f21, < b7bf516c3ecd9a2aae2dc2635178ab87b734fef1 | 5.15

  • linux•linux_kernel

    ≥ 5.15.1, < 5.15.203 | ≥ 5.16, < 6.1.167 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.77 | ≥ 6.13, < 6.18.17 | ≥ 6.19, < 6.19.7 | 5.15 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7

References (7)