Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/smc: do not dereference an unset send buffer on the SMC-D teardown path smc_close_stream_wait() calls smc_tx_prepared_sends() from inside its sk_wait_event() condition, and sk_wait_event() evaluates that condition once with the socket lock released. smcd_buf_detach() clears conn->sndbuf_desc from smc_conn_kill() under lock_sock(), so a link group terminating while a socket waits there leaves the helper dereferencing NULL, faulting out of close(). SIOCOUTQ reads the field by hand, and smc_close_cancel_work() drops the lock across two cancel_*_sync() calls. Sample the pointer once in the helper, report nothing prepared while it is unset, and bound the ioctl the same way. The receive tasklet dereferences the field directly in smc_cdc_msg_recv_action(), not through this helper; 1/2 is what keeps it from running that late.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd before ab26e12dd5d2f43d939fcf456933a816e81d2e51; affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before e3fcff8d22a6c9540748846cd800443a643553a6; affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45; affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before f517cf02033801a28f98d86ca613a3533cf066b3; affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before b395dd319cea422239cb45b998fb38d7e373af87; affected 6.6.66 before 6.6.157 |
| Linux / Linux | affected 6.10; unaffected 0 before 6.10; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 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/ab26e12dd5d2f43d939fcf456933a816e81d2e51
- https://git.kernel.org/stable/c/e3fcff8d22a6c9540748846cd800443a643553a6
- https://git.kernel.org/stable/c/f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45
- https://git.kernel.org/stable/c/f517cf02033801a28f98d86ca613a3533cf066b3
- https://git.kernel.org/stable/c/b395dd319cea422239cb45b998fb38d7e373af87