CVE-2026-74391
Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Bound synthetic-field strings with seq_buf The synthetic field helpers build a prefixed synthetic variable name and a generated hist command in fixed MAX_FILTER_STR_VAL buffers. The current code appends those strings with raw strcat(), so long key lists, field names, or saved filters can run past the end of the staging buffers. Build both strings with seq_buf and propagate -E2BIG if either the synthetic variable name or the generated command exceeds MAX_FILTER_STR_VAL. This keeps the existing tracing-side limit while using the helper intended for bounded command construction. [ sdr: Moved struct seq_buf *s for upside-down x-mas tree formatting ]
How to fix
- Linux Linux9f8ef2e1e95a42044e614b0a5277e3f53f545135, 0c584c27f6649a93ec12061cc779a4bd8f7c1434, 88b901fdc1662b131ff908cbd017333b61e7acc8, baa333b2700a7fa3529d504529c8c10060fd687c, cf334620036ad2250e008c7e7bb6646a3938b7b0, f07883450eb14d1cf020b55d9f3a7ec5683bcd26 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 02205a6752f223779a1b0e9e8ffacbea6e717851 ≤ v < 9f8ef2e1e95a42044e614b0a5277e3f53f545135, 02205a6752f223779a1b0e9e8ffacbea6e717851 ≤ v < 0c584c27f6649a93ec12061cc779a4bd8f7c1434, 02205a6752f223779a1b0e9e8ffacbea6e717851 ≤ v < 88b901fdc1662b131ff908cbd017333b61e7acc8, 02205a6752f223779a1b0e9e8ffacbea6e717851 ≤ v < baa333b2700a7fa3529d504529c8c10060fd687c, 02205a6752f223779a1b0e9e8ffacbea6e717851 ≤ v < cf334620036ad2250e008c7e7bb6646a3938b7b0, 02205a6752f223779a1b0e9e8ffacbea6e717851 ≤ v < f07883450eb14d1cf020b55d9f3a7ec5683bcd26, 4.17 | 9f8ef2e1e95a42044e614b0a5277e3f53f545135, 0c584c27f6649a93ec12061cc779a4bd8f7c1434, 88b901fdc1662b131ff908cbd017333b61e7acc8, baa333b2700a7fa3529d504529c8c10060fd687c, cf334620036ad2250e008c7e7bb6646a3938b7b0, f07883450eb14d1cf020b55d9f3a7ec5683bcd26 |
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