CVE-2026-90307RDMA/srp: fix heap information leak on a truncated SRP_CRED_REQ

Official description

In the Linux kernel, the following vulnerability has been resolved: RDMA/srp: fix heap information leak on a truncated SRP_CRED_REQ srp_recv_done() passes wc->byte_len to srp_process_rsp(). It passes nothing to srp_process_cred_req() and srp_process_aer_req(), which read fixed-size fields from the receive buffer without checking that those fields were received. The buffer size is max_ti_iu_len, which comes from the login response and is not validated. A target that advertises 8 and then sends an 8-byte SRP_CRED_REQ makes the initiator read req->tag from beyond the end of the buffer. req->tag is copied into the SRP_CRED_RSP and sent back, so those bytes reach the target. SRP_AER_REQ behaves the same way and also reads req->lun. The leak is 8 bytes per response. max_ti_iu_len also decides which slab cache the buffer comes from. With 8 the buffer is a kmalloc-8 object and the read is entirely outside it: BUG: KASAN: slab-out-of-bounds in srp_recv_done+0x172b/0x1aa0 Read of size 8 at addr ffff888104714da8 by task kworker/u8:3/50 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 8-byte region [ffff888104714da0, ffff888104714da8) Without KASAN the returned bytes are whatever is next in the slab. One run returned ".strtab". rsp->data[3] in srp_process_rsp() has the same problem: only resp_data_len is checked before it is read. Drop a request that is shorter than the structure being parsed, and check byte_len before the tsk_mgmt read.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/3f7fdf561f1ec3b523c39708df00bd808671668d
• https://git.kernel.org/stable/c/138eb2f0ef02adfe6ad126afad5b54c56b5046ee
• https://git.kernel.org/stable/c/3787f4c3e0d813d6c56be9f6dfaf66f8551fb0a7
• https://git.kernel.org/stable/c/0e7ba617514902501514d577647d866e670dad90
• https://git.kernel.org/stable/c/001adf2fe87d1ab677c014a97467bbea5153ae5f
• https://git.kernel.org/stable/c/dc2272c00d7c00ee2a69b57f7ca9caaefcbdb8cd
• https://git.kernel.org/stable/c/fa1b33fdab3e79dce83721ead3220200a2dbec22
• https://git.kernel.org/stable/c/961ac0f0c5e414abdd6b33fae84b311d9fde0bd0