Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: lockd, nfsd: RCU-protect nlmsvc_ops dispatch nlmsvc_ops is published by nfsd_lockd_init() and cleared by nfsd_lockd_shutdown() with plain stores, while lockd dereferences it unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer targets nfsd's .rodata and the fopen/fclose callbacks live in nfsd's .text, so a stale load after rmmod nfsd results in either a NULL deref or a module-text use-after-free. Declare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear via RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module *owner field to nlmsvc_binding and pin the module across indirect calls with try_module_get/module_put. When the binding is torn down, fall back to fput() to avoid leaking struct file references.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 43943532c105ea8fe26039a1347cfda4ac0fcadc; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6e7495972039f212e336e552b58cac9dd54611c3; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 836ce2b99bcce6d68c58edd04efbc5cd1fd581af; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3c461a1820088fb5889d73a6522369bde45527a9; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 641e5e20852359b8c31149be4598884e30652f60 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/43943532c105ea8fe26039a1347cfda4ac0fcadc
- https://git.kernel.org/stable/c/6e7495972039f212e336e552b58cac9dd54611c3
- https://git.kernel.org/stable/c/836ce2b99bcce6d68c58edd04efbc5cd1fd581af
- https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9
- https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60
ADP enrichment
No English description supplied.
No references supplied.