Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/smc: unregister the connection before draining the rx tasklet smc_conn_free() calls smc_ism_unset_conn() only while the link group is still on its device list, and never sets conn->killed. smc_lgr_terminate_sched() unlinks the group immediately and defers killing its connections to a work item, so a connection freed in that window keeps its smcd->conn[] slot with both gates in smcd_handle_irq() open, and the device can re-arm the receive tasklet after tasklet_kill() has returned. On the DMB-nocopy path the ghost send buffer is freed right after that drain, so the re-armed tasklet dereferences it. Unregister unconditionally and drain before the detach at both teardown sites, mirroring rmb_desc, which smc_buf_unuse() releases after the drain. Clear conn->sndbuf_desc before freeing it as well, so a reader that samples the pointer cannot get one that is already freed.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd before b6b6ac713ee82b340a8e3be30b101bd2840deec4; affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5; affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before 5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3; affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before b74d313567dfc1b7e56629ddbad04e728686f235; affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before 36cdf5d48ca191dcd71c28cadbe0981b1d25318d; 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/b6b6ac713ee82b340a8e3be30b101bd2840deec4
- https://git.kernel.org/stable/c/b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5
- https://git.kernel.org/stable/c/5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3
- https://git.kernel.org/stable/c/b74d313567dfc1b7e56629ddbad04e728686f235
- https://git.kernel.org/stable/c/36cdf5d48ca191dcd71c28cadbe0981b1d25318d