Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: evm: terminate and bound the evm_xattrs read buffer evm_read_xattrs() allocates size + 1 bytes, fills them from the list of enabled xattrs, and then passes strlen(temp) to simple_read_from_buffer(). When no configured xattrs are enabled, the fill loop stores nothing and temp[0] remains uninitialized, so strlen() reads beyond initialized memory. Explicitly terminate the buffer after allocation, use snprintf() for each formatted line, and pass the accumulated length, without risk of truncation, to simple_read_from_buffer().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected fa516b66a1bfce1d72f1620c54bdfebc493000d1 before 8df81954d22a653a8b01d46692cd56f71137269b; affected fa516b66a1bfce1d72f1620c54bdfebc493000d1 before 0b9f8282b40af4a99d6243d2cb939d14ff36b049; affected fa516b66a1bfce1d72f1620c54bdfebc493000d1 before a36cbfb85f26e6c6fb6529b1a364331b94dc88f3; affected fa516b66a1bfce1d72f1620c54bdfebc493000d1 before 12ad52dc45a0c8c9d25e85b4a84201de4c5420ed; affected fa516b66a1bfce1d72f1620c54bdfebc493000d1 before a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d; affected fa516b66a1bfce1d72f1620c54bdfebc493000d1 before 38b7d63b23aa9d2ddde7688040e9426d32be4065; affected fa516b66a1bfce1d72f1620c54bdfebc493000d1 before 11143a19f5b8dc8f414deab87571134f9f447313 |
| Linux / Linux | affected 4.18; unaffected 0 before 4.18; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8df81954d22a653a8b01d46692cd56f71137269b
- https://git.kernel.org/stable/c/0b9f8282b40af4a99d6243d2cb939d14ff36b049
- https://git.kernel.org/stable/c/a36cbfb85f26e6c6fb6529b1a364331b94dc88f3
- https://git.kernel.org/stable/c/12ad52dc45a0c8c9d25e85b4a84201de4c5420ed
- https://git.kernel.org/stable/c/a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d
- https://git.kernel.org/stable/c/38b7d63b23aa9d2ddde7688040e9426d32be4065
- https://git.kernel.org/stable/c/11143a19f5b8dc8f414deab87571134f9f447313