Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: avoid userspace overflow on invalid optlen nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so the kernel always stores 4 bytes regardless of the caller-supplied optlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length reported back to userspace; it does not constrain the store. A call with optlen < 4 therefore writes past the user buffer, violating the getsockopt(2) contract for all five supported optnames. Reject any call with optlen < sizeof(u32) up front. 'len' is int, so a plain size comparison would promote a negative optlen to size_t and slip past the check; an explicit 'len < 0' test is added first to catch negative values before the size compare.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 42859562b7cc4313a84a584f338118edb7087066; affected 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 598dcd53c52f8eeb9dd5382198c03960d5d40fcd; affected 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 7e40f2f5e7bc06c3ddef781180ce4f7994176547; affected 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 35573c6cb081af2f4a7caeea291302aca5484526; affected 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before b4c5abaea06292e1dddb70eac1b51589b32c77a3; affected 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67; affected 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before bd6f1277b62bc1df348ca21739df2bc546fcd493; affected 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 99985bfa8336fadcc69190ba2dcbd5386af3d661 |
| Linux / Linux | affected 3.10; unaffected 0 before 3.10; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066
- https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd
- https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547
- https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526
- https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3
- https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67
- https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493
- https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661