Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: Input: touchwin - reset the packet index on every complete packet tw_interrupt() accumulates each non-zero serial byte into a fixed three-byte buffer with a running index that is only reset once a full packet has been received *and* the device's two Y bytes agree: tw->data[tw->idx++] = data; if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) { ... tw->idx = 0; } The reset is gated on tw->data[1] == tw->data[2], a value the device controls. A malicious, malfunctioning or counterfeit Touchwindow peripheral can stream non-zero bytes whose 2nd and 3rd bytes differ: the index reaches TW_LENGTH without the equality holding, is never reset, and keeps growing, so tw->data[tw->idx++] walks off the end of the three-byte array and the rest of the heap-allocated struct tw, one attacker-chosen byte at a time -- an unbounded, device-driven heap out-of-bounds write. Reset the index on every completed packet and report an event only when the two Y bytes match, like the other serio touchscreen drivers do.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 11ea3173d5f2de71d037ef58ac43395795fed2bc before ed9b66905407eb3d02df1aaeed82eb7a7f0eb508; affected 11ea3173d5f2de71d037ef58ac43395795fed2bc before 044167cba2384bcd783547ad5e30ecd292b30919; affected 11ea3173d5f2de71d037ef58ac43395795fed2bc before 6c9f29f128dd4057404838259af4c645318487e1; affected 11ea3173d5f2de71d037ef58ac43395795fed2bc before 431ad239f2924dff337c3fccb9246597c1b63185; affected 11ea3173d5f2de71d037ef58ac43395795fed2bc before 70e4248793762df9832fd4fc2fc6ac7924572c36; affected 11ea3173d5f2de71d037ef58ac43395795fed2bc before 3e6f007b43e2fc6546e21fa74ee62c38984a6672; affected 11ea3173d5f2de71d037ef58ac43395795fed2bc before a8d87184576c889759e3aab899799a482f1e1a5b; affected 11ea3173d5f2de71d037ef58ac43395795fed2bc before 478cdd736f2ce3114f90e775d7358136d3977b94 |
| Linux / Linux | affected 2.6.19; unaffected 0 before 2.6.19; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.96 through 6.12.*; unaffected 6.18.39 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ed9b66905407eb3d02df1aaeed82eb7a7f0eb508
- https://git.kernel.org/stable/c/044167cba2384bcd783547ad5e30ecd292b30919
- https://git.kernel.org/stable/c/6c9f29f128dd4057404838259af4c645318487e1
- https://git.kernel.org/stable/c/431ad239f2924dff337c3fccb9246597c1b63185
- https://git.kernel.org/stable/c/70e4248793762df9832fd4fc2fc6ac7924572c36
- https://git.kernel.org/stable/c/3e6f007b43e2fc6546e21fa74ee62c38984a6672
- https://git.kernel.org/stable/c/a8d87184576c889759e3aab899799a482f1e1a5b
- https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94