In the Linux kernel, the following vulnerability has been resolved:
RDMA/irdma: Fix kernel stack leak in irdma_create_user_ah()
struct irdma_create_ah_resp { // 8 bytes, no padding
__u32 ah_id; // offset 0 - SET (uresp.ah_id = ah->sc_ah.ah_info.ah_idx)
__u8 rsvd[4]; // offset 4 - NEVER SET <- LEAK
};
rsvd[4]: 4 bytes of stack memory leaked unconditionally. Only ah_id is assigned before ib_respond_udata().
The reserved members of the structure were not zeroed.
References 6
https://git.kernel.org/stable/c/14b47c07c69930254f549a17ee245c80a65b1609
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/1b1fac4c7a3ab7f52e9cfb91e5c91216646ca4d8
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/2fd37450d271d74b3847baed284f9cfdf198c6f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/74586c6da9ea222a61c98394f2fc0a604748438c
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c9bd0007c4bdb7806bbd323287e50f9cf467c51a
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/cfe962216c164fe2b1c1fb6ac925a7413f5abc84
416baaa9-dc9f-4396-8d5f-8c081fb06d67