Answer in brief
CVE-2026-23359 records a High severity (CVSS 7.8) vulnerability in bpf: Fix stack-out-of-bounds write in devmap. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-23359 records a High severity (CVSS 7.8) vulnerability in bpf: Fix stack-out-of-bounds write in devmap. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=aeea1b86f9363f3feabb496534d886f082a89f21 <88df604f0d16a692867582350ce3f2fcd22243f1 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <5000e40acc8d0c36ab709662e32120986ac22e7e || >=aeea1b86f9363f3feabb496534d886f082a89f21 <8a95fb9df1105b1618872c2846a6c01e3ba20b45 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <d2c31d8e03d05edc16656e5ffe187f0d1da763d7 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <ca831567908fd3f73cf97d8a6c09a5054697a182 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <b7bf516c3ecd9a2aae2dc2635178ab87b734fef1 | 88df604f0d16a692867582350ce3f2fcd22243f1, 5000e40acc8d0c36ab709662e32120986ac22e7e, 8a95fb9df1105b1618872c2846a6c01e3ba20b45, d2c31d8e03d05edc16656e5ffe187f0d1da763d7, 75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2, ca831567908fd3f73cf97d8a6c09a5054697a182, b7bf516c3ecd9a2aae2dc2635178ab87b734fef1 |
| Linux/Linuxgeneric | 5.15 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Mar 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=aeea1b86f9363f3feabb496534d886f082a89f21 <88df604f0d16a692867582350ce3f2fcd22243f1 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <5000e40acc8d0c36ab709662e32120986ac22e7e || >=aeea1b86f9363f3feabb496534d886f082a89f21 <8a95fb9df1105b1618872c2846a6c01e3ba20b45 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <d2c31d8e03d05edc16656e5ffe187f0d1da763d7 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <ca831567908fd3f73cf97d8a6c09a5054697a182 || >=aeea1b86f9363f3feabb496534d886f082a89f21 <b7bf516c3ecd9a2aae2dc2635178ab87b734fef1 | 88df604f0d16a692867582350ce3f2fcd22243f1, 5000e40acc8d0c36ab709662e32120986ac22e7e, 8a95fb9df1105b1618872c2846a6c01e3ba20b45, d2c31d8e03d05edc16656e5ffe187f0d1da763d7, 75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2, ca831567908fd3f73cf97d8a6c09a5054697a182, b7bf516c3ecd9a2aae2dc2635178ab87b734fef1 |
| Linux/Linuxgeneric | 5.15 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Mar 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.