Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix missing validation of ticket length in non-XDR key preparsing In rxrpc_preparse(), there are two paths for parsing key payloads: the XDR path (for large payloads) and the non-XDR path (for payloads <= 28 bytes). While the XDR path (rxrpc_preparse_xdr_rxkad()) correctly validates the ticket length against AFSTOKEN_RK_TIX_MAX, the non-XDR path fails to do so. This allows an unprivileged user to provide a very large ticket length. When this key is later read via rxrpc_read(), the total token size (toksize) calculation results in a value that exceeds AFSTOKEN_LENGTH_MAX, triggering a WARN_ON(). [ 2001.302904] WARNING: CPU: 2 PID: 2108 at net/rxrpc/key.c:778 rxrpc_read+0x109/0x5c0 [rxrpc] Fix this by adding a check in the non-XDR parsing path of rxrpc_preparse() to ensure the ticket length does not exceed AFSTOKEN_RK_TIX_MAX, bringing it into parity with the XDR parsing logic.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 before 44714dfda386884919ba366411880b6fb3c3efd3; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 before 41a117dd80371343babc52198d1114e83eb37627; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 before 9a397aa9b5e53ca63d4d6aefb542832eca389618; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 before 1fa36cf495b0023e8475d038535c05e4063211e1; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 before 4458757c020592a3094366e0fb20457383b42f92; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 before ce383ba615339f8eaec646a166d2c2b015bb5ca0; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 before a1be1c9ece26cea69654f28b255ff9a7906b897b; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 before ac33733b10b484d666f97688561670afd5861383 |
| Linux / Linux | affected 3.17; unaffected 0 before 3.17; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.136 through 6.6.*; unaffected 6.12.84 through 6.12.*; unaffected 6.18.25 through 6.18.*; unaffected 7.0.2 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/44714dfda386884919ba366411880b6fb3c3efd3
- https://git.kernel.org/stable/c/41a117dd80371343babc52198d1114e83eb37627
- https://git.kernel.org/stable/c/9a397aa9b5e53ca63d4d6aefb542832eca389618
- https://git.kernel.org/stable/c/1fa36cf495b0023e8475d038535c05e4063211e1
- https://git.kernel.org/stable/c/4458757c020592a3094366e0fb20457383b42f92
- https://git.kernel.org/stable/c/ce383ba615339f8eaec646a166d2c2b015bb5ca0
- https://git.kernel.org/stable/c/a1be1c9ece26cea69654f28b255ff9a7906b897b
- https://git.kernel.org/stable/c/ac33733b10b484d666f97688561670afd5861383
ADP enrichment
No English description supplied.