{"cve":{"cve_id":"CVE-2026-52939","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: fix NULL deref in rds_ib_send_cqe_handler() on masked atomic completion\n\nrds_ib_xmit_atomic() always programs a masked atomic opcode\n(IB_WR_MASKED_ATOMIC_CMP_AND_SWP or IB_WR_MASKED_ATOMIC_FETCH_AND_ADD)\nfor every RDS atomic cmsg.  But the completion-side switch in\nrds_ib_send_unmap_op() only handles the non-masked opcodes, so a masked\natomic completion falls through to default and returns rm == NULL while\nsend->s_op is left set.  rds_ib_send_cqe_handler() then dereferences the\nNULL rm via rm->m_final_op, oopsing in softirq context.  An unprivileged\nAF_RDS sendmsg() of an atomic cmsg over an active RDS/IB connection\ntriggers it; on hardware that natively accepts masked atomics (mlx4,\nmlx5) no extra setup is needed.\n\n  RDS/IB: rds_ib_send_unmap_op: unexpected opcode 0xd in WR!\n  Oops: general protection fault [#1] SMP KASAN\n  KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]\n  RIP: rds_ib_send_cqe_handler+0x25c/0xb10 (net/rds/ib_send.c:282)\n  Call Trace:\n   <IRQ>\n   rds_ib_send_cqe_handler (net/rds/ib_send.c:282)\n   poll_scq (net/rds/ib_cm.c:274)\n   rds_ib_tasklet_fn_send (net/rds/ib_cm.c:294)\n   tasklet_action_common (kernel/softirq.c:943)\n   handle_softirqs (kernel/softirq.c:573)\n   run_ksoftirqd (kernel/softirq.c:479)\n   </IRQ>\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nHandle the masked atomic opcodes in the same case as the non-masked\nones: they map to the same struct rds_message.atomic union member, so\nthe existing container_of()/rds_ib_send_unmap_atomic() body is correct\nfor them.","published_at":"2026-06-24T07:14:28.622000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/a0148342badd8c9b2e46551766a27cb76c82e715","https://git.kernel.org/stable/c/4dd262f875e87653df50b138de1390ab0628e6b7","https://git.kernel.org/stable/c/6e4615164d185a26badb2f376a2449f4d174a5f0","https://git.kernel.org/stable/c/0f22412a2f4fbbe0251c132abee045d15a90e5b6","https://git.kernel.org/stable/c/0f7baa82a24813cdad0b06a6f8f07e4824af5ed5","https://git.kernel.org/stable/c/dcf458120add64c96a6ef5cf719340453f6e6abf","https://git.kernel.org/stable/c/4fd34669558085bcb589aa2078a13b0ca79e360d","https://git.kernel.org/stable/c/34080db3e70ddf94c38512ad2331e3c3afca6cc1"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:22.518073Z","updated_at":"2026-06-28T23:30:49.890169Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"20c72bd5f5f902e5a8745d51573699605bf8d21c","version_start_inclusive":true,"version_end":"a0148342badd8c9b2e46551766a27cb76c82e715","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:20c72bd5f5f902e5a8745d51573699605bf8d21c:a0148342badd8c9b2e46551766a27cb76c82e715"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"20c72bd5f5f902e5a8745d51573699605bf8d21c","version_start_inclusive":true,"version_end":"4dd262f875e87653df50b138de1390ab0628e6b7","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:20c72bd5f5f902e5a8745d51573699605bf8d21c:4dd262f875e87653df50b138de1390ab0628e6b7"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"20c72bd5f5f902e5a8745d51573699605bf8d21c","version_start_inclusive":true,"version_end":"6e4615164d185a26badb2f376a2449f4d174a5f0","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:20c72bd5f5f902e5a8745d51573699605bf8d21c:6e4615164d185a26badb2f376a2449f4d174a5f0"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"20c72bd5f5f902e5a8745d51573699605bf8d21c","version_start_inclusive":true,"version_end":"0f22412a2f4fbbe0251c132abee045d15a90e5b6","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:20c72bd5f5f902e5a8745d51573699605bf8d21c:0f22412a2f4fbbe0251c132abee045d15a90e5b6"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"20c72bd5f5f902e5a8745d51573699605bf8d21c","version_start_inclusive":true,"version_end":"0f7baa82a24813cdad0b06a6f8f07e4824af5ed5","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:20c72bd5f5f902e5a8745d51573699605bf8d21c:0f7baa82a24813cdad0b06a6f8f07e4824af5ed5"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"20c72bd5f5f902e5a8745d51573699605bf8d21c","version_start_inclusive":true,"version_end":"dcf458120add64c96a6ef5cf719340453f6e6abf","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:20c72bd5f5f902e5a8745d51573699605bf8d21c:dcf458120add64c96a6ef5cf719340453f6e6abf"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"20c72bd5f5f902e5a8745d51573699605bf8d21c","version_start_inclusive":true,"version_end":"4fd34669558085bcb589aa2078a13b0ca79e360d","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:20c72bd5f5f902e5a8745d51573699605bf8d21c:4fd34669558085bcb589aa2078a13b0ca79e360d"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"20c72bd5f5f902e5a8745d51573699605bf8d21c","version_start_inclusive":true,"version_end":"34080db3e70ddf94c38512ad2331e3c3afca6cc1","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:20c72bd5f5f902e5a8745d51573699605bf8d21c:34080db3e70ddf94c38512ad2331e3c3afca6cc1"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"2.6.37","version_start_inclusive":true,"version_end":"2.6.37","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:2.6.37:2.6.37"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"2.6.37","version_end_inclusive":false,"cpe23_uri":"cve5:l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published","source":null}]}