CVE-2026-23359bpf: Fix stack-out-of-bounds write in devmap
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from aeea1b86f9363f3feabb496534d886f082a89f21 before 88df604f0d16a692867582350ce3f2fcd22243f1; from aeea1b86f9363f3feabb496534d886f082a89f21 before 5000e40acc8d0c36ab709662e32120986ac22e7e; from aeea1b86f9363f3feabb496534d886f082a89f21 before 8a95fb9df1105b1618872c2846a6c01e3ba20b45; from aeea1b86f9363f3feabb496534d886f082a89f21 before d2c31d8e03d05edc16656e5ffe187f0d1da763d7; from aeea1b86f9363f3feabb496534d886f082a89f21 before 75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2; from aeea1b86f9363f3feabb496534d886f082a89f21 before ca831567908fd3f73cf97d8a6c09a5054697a182; from aeea1b86f9363f3feabb496534d886f082a89f21 before b7bf516c3ecd9a2aae2dc2635178ab87b734fef1 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.15.1 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 5.15; 7.0; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/88df604f0d16a692867582350ce3f2fcd22243f1patch
- https://git.kernel.org/stable/c/5000e40acc8d0c36ab709662e32120986ac22e7epatch
- https://git.kernel.org/stable/c/8a95fb9df1105b1618872c2846a6c01e3ba20b45patch
- https://git.kernel.org/stable/c/d2c31d8e03d05edc16656e5ffe187f0d1da763d7patch
- https://git.kernel.org/stable/c/75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2patch
- https://git.kernel.org/stable/c/ca831567908fd3f73cf97d8a6c09a5054697a182patch
- https://git.kernel.org/stable/c/b7bf516c3ecd9a2aae2dc2635178ab87b734fef1patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.