Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_helper: pass helper to expect cleanup nf_conntrack_helper_unregister() calls nf_ct_expect_iterate_destroy() to remove expectations belonging to the helper being unregistered. However, it passes NULL instead of the helper pointer as the data argument, so expect_iter_me() never matches any expectation and all of them survive the cleanup. After unregister returns, nfnl_cthelper_del() frees the helper object immediately. Subsequent expectation dumps or packet-driven init_conntrack() calls then dereference the freed exp->helper, causing a use-after-free. Pass the actual helper pointer so expectations referencing it are properly destroyed before the helper object is freed. BUG: KASAN: slab-use-after-free in string+0x38f/0x430 Read of size 1 at addr ffff888003b14d20 by task poc/103 Call Trace: string+0x38f/0x430 vsnprintf+0x3cc/0x1170 seq_printf+0x17a/0x240 exp_seq_show+0x2e5/0x560 seq_read_iter+0x419/0x1280 proc_reg_read+0x1ac/0x270 vfs_read+0x179/0x930 ksys_read+0xef/0x1c0 Freed by task 103: The buggy address is located 32 bytes inside of freed 192-byte region [ffff888003b14d00, ffff888003b14dc0)
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ac7b848390036dadd4351899d2a23748075916bd before 5cf28d5c8dcbbe8af6d3b145babe491906d7bad1; affected ac7b848390036dadd4351899d2a23748075916bd before 504ba4168466c91210c45acdc332479cfd5f2da6; affected ac7b848390036dadd4351899d2a23748075916bd before dc1739eff48e34cc71d4e2f03715493fbcebd8af; affected ac7b848390036dadd4351899d2a23748075916bd before 2cf2737c85a2ba2b52024dafe68ffad2676f97be; affected ac7b848390036dadd4351899d2a23748075916bd before 2c16e4d64dd91227742dfe196a3e7b0568bef65a; affected ac7b848390036dadd4351899d2a23748075916bd before 620f3d14c1ef51d425060a3056ad8dbae8f998a3; affected ac7b848390036dadd4351899d2a23748075916bd before 90bd7e8501349db3006d21fbc09df9ffcb172965; affected ac7b848390036dadd4351899d2a23748075916bd before a242a9ae58aa46ff7dae51ce64150a93957abe65 |
| Linux / Linux | affected 4.14; unaffected 0 before 4.14; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.168 through 6.1.*; unaffected 6.6.134 through 6.6.*; unaffected 6.12.81 through 6.12.*; unaffected 6.18.22 through 6.18.*; unaffected 6.19.12 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5cf28d5c8dcbbe8af6d3b145babe491906d7bad1
- https://git.kernel.org/stable/c/504ba4168466c91210c45acdc332479cfd5f2da6
- https://git.kernel.org/stable/c/dc1739eff48e34cc71d4e2f03715493fbcebd8af
- https://git.kernel.org/stable/c/2cf2737c85a2ba2b52024dafe68ffad2676f97be
- https://git.kernel.org/stable/c/2c16e4d64dd91227742dfe196a3e7b0568bef65a
- https://git.kernel.org/stable/c/620f3d14c1ef51d425060a3056ad8dbae8f998a3
- https://git.kernel.org/stable/c/90bd7e8501349db3006d21fbc09df9ffcb172965
- https://git.kernel.org/stable/c/a242a9ae58aa46ff7dae51ce64150a93957abe65
ADP enrichment
No English description supplied.