CVE-2026-46081
published 2026-05-27CVE-2026-46081: In the Linux kernel, the following vulnerability has been resolved: crypto: acomp - fix wrong pointer stored by acomp_save_req() acomp_save_req() stores…
high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
In the Linux kernel, the following vulnerability has been resolved:
crypto: acomp - fix wrong pointer stored by acomp_save_req()
acomp_save_req() stores &req->chain in req->base.data. When
acomp_reqchain_done() is invoked on asynchronous completion, it receives
&req->chain as the data argument but casts it directly to struct
acomp_req. Since data points to the chain member, all subsequent field
accesses are at a wrong offset, resulting in memory corruption.
The issue occurs when an asynchronous hardware implementation, such as
the QAT driver, completes a request that uses the DMA virtual address
interface (e.g. acomp_request_set_src_dma()). This combination causes
crypto_acomp_compress() to enter the acomp_do_req_chain() path, which
sets acomp_reqchain_done() as the completion callback via
acomp_save_req().
With KASAN enabled, this manifests as a general protection fault in
acomp_reqchain_done():
general protection fault, probably for non-canonical address 0xe000040000000000
KASAN: probably user-memory-access in range [0x0000400000000000-0x0000400000000007]
RIP: 0010:acomp_reqchain_done+0x15b/0x4e0
Call Trace:
qat_comp_alg_callback+0x5d/0xa0 [intel_qat]
adf_ring_response_handler+0x376/0x8b0 [intel_qat]
adf_response_handler+0x60/0x170 [intel_qat]
tasklet_action_common+0x223/0x820
handle_softirqs+0x1ab/0x640
Fix this by storing the request itself in req->base.data instead of
&req->chain, so that acomp_reqchain_done() receives the correct pointer.
Simplify acomp_restore_req() accordingly to access req->chain directly.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 64929fe8c0a43508eee952cf57903a61c52601e7 < 343a5bf68a8ff9affcf2b70677ea4cf40c195ee4 | 343a5bf68a8ff9affcf2b70677ea4cf40c195ee4 |
| linux | linux | >= 64929fe8c0a43508eee952cf57903a61c52601e7 < 1a2785e5985627f2265ba7775949601a29ba0d1e | 1a2785e5985627f2265ba7775949601a29ba0d1e |
| linux | linux | >= 64929fe8c0a43508eee952cf57903a61c52601e7 < d7e20b9bd6c990773cf0c09e2642250b8a70263d | d7e20b9bd6c990773cf0c09e2642250b8a70263d |
| linux | linux_kernel | — | — |