{"id":"CVE-2026-46081","summary":"crypto: acomp - fix wrong pointer stored by acomp_save_req()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: acomp - fix wrong pointer stored by acomp_save_req()\n\nacomp_save_req() stores &req-\u003echain in req-\u003ebase.data. When\nacomp_reqchain_done() is invoked on asynchronous completion, it receives\n&req-\u003echain as the data argument but casts it directly to struct\nacomp_req. Since data points to the chain member, all subsequent field\naccesses are at a wrong offset, resulting in memory corruption.\n\nThe issue occurs when an asynchronous hardware implementation, such as\nthe QAT driver, completes a request that uses the DMA virtual address\ninterface (e.g. acomp_request_set_src_dma()). This combination causes\ncrypto_acomp_compress() to enter the acomp_do_req_chain() path, which\nsets acomp_reqchain_done() as the completion callback via\nacomp_save_req().\n\nWith KASAN enabled, this manifests as a general protection fault in\nacomp_reqchain_done():\n\n  general protection fault, probably for non-canonical address 0xe000040000000000\n  KASAN: probably user-memory-access in range [0x0000400000000000-0x0000400000000007]\n  RIP: 0010:acomp_reqchain_done+0x15b/0x4e0\n  Call Trace:\n   \u003cIRQ\u003e\n   qat_comp_alg_callback+0x5d/0xa0 [intel_qat]\n   adf_ring_response_handler+0x376/0x8b0 [intel_qat]\n   adf_response_handler+0x60/0x170 [intel_qat]\n   tasklet_action_common+0x223/0x820\n   handle_softirqs+0x1ab/0x640\n   \u003c/IRQ\u003e\n\nFix this by storing the request itself in req-\u003ebase.data instead of\n&req-\u003echain, so that acomp_reqchain_done() receives the correct pointer.\nSimplify acomp_restore_req() accordingly to access req-\u003echain directly.","modified":"2026-06-26T11:56:15.574758128Z","published":"2026-05-27T12:58:19.498Z","related":["openSUSE-SU-2026:10954-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46081.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1a2785e5985627f2265ba7775949601a29ba0d1e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/343a5bf68a8ff9affcf2b70677ea4cf40c195ee4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d7e20b9bd6c990773cf0c09e2642250b8a70263d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46081.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46081"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"64929fe8c0a43508eee952cf57903a61c52601e7"},{"fixed":"343a5bf68a8ff9affcf2b70677ea4cf40c195ee4"},{"fixed":"1a2785e5985627f2265ba7775949601a29ba0d1e"},{"fixed":"d7e20b9bd6c990773cf0c09e2642250b8a70263d"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46081.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.16.0"},{"fixed":"6.18.27"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46081.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}