In the Linux kernel, the following vulnerability has been resolved:
RDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads
atomic_write_reply() at drivers/infiniband/sw/rxe/rxe_resp.c
unconditionally dereferences 8 bytes at payload_addr(pkt):
value = *(u64 *)payload_addr(pkt);
check_rkey() previously accepted an ATOMIC_WRITE request with pktlen ==
resid == 0 because the length validation only compared pktlen against
resid. A remote initiator that sets the RETH length to 0 therefore reaches
atomic_write_reply() with a zero-byte logical payload, and the responder
reads sizeof(u64) bytes from past the logical end of the packet into
skb->head tailroom, then writes those 8 bytes into the attacker's MR via
rxe_mr_do_atomic_write(). That is a remote disclosure of 4 bytes of kernel
tailroom per probe (the other 4 bytes are the packet's own trailing ICRC).
IBA oA19-28 defines ATOMIC_WRITE as exactly 8 bytes. Anything else is
protocol-invalid. Hoist a strict length check into check_rkey() so the
responder never reaches the unchecked dereference, and keep the existing
WRITE-family length logic for the normal RDMA WRITE path.
Reproduced on mainline with an unmodified rxe driver: a sustained
zero-length ATOMIC_WRITE probe repeatedly leaks adjacent skb head-buffer
bytes into the attacker's MR, including recognisable kernel strings and
partial kernel-direct-map pointer words. With this patch applied the
responder rejects the PDU and the MR stays all-zero.
References
Configurations
Configuration 1 (hide)
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History
24 Jun 2026, 17:00
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-476 | |
| References | () https://git.kernel.org/stable/c/105bf79a23b85cf3a761d18a4f3e10ce88526bc1 - Patch | |
| References | () https://git.kernel.org/stable/c/1114c87aa6f195cf07da55a27b2122ae26557b26 - Patch | |
| References | () https://git.kernel.org/stable/c/539cabb7b2d8ba70f55bba91db55faef11c2a6d7 - Patch | |
| References | () https://git.kernel.org/stable/c/7ec1ed4747f5f99f8b797bb438c5efd36079fad5 - Patch | |
| References | () https://git.kernel.org/stable/c/d415fce3fcde6d7aeea6c25362a395b905811452 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
30 May 2026, 11:17
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
28 May 2026, 10:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-28 10:16
Updated : 2026-06-24 17:00
NVD link : CVE-2026-46114
Mitre link : CVE-2026-46114
CVE.ORG link : CVE-2026-46114
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference