{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-52939", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.370Z", "datePublished": "2026-06-24T07:14:28.622Z", "dateUpdated": "2026-06-24T07:14:28.622Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T07:14:28.622Z" }, "descriptions": [ { "lang": "en", "value": "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 \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 \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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rds/ib_send.c" ], "versions": [ { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "lessThan": "a0148342badd8c9b2e46551766a27cb76c82e715", "status": "affected", "versionType": "git" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "lessThan": "4dd262f875e87653df50b138de1390ab0628e6b7", "status": "affected", "versionType": "git" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "lessThan": "6e4615164d185a26badb2f376a2449f4d174a5f0", "status": "affected", "versionType": "git" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "lessThan": "0f22412a2f4fbbe0251c132abee045d15a90e5b6", "status": "affected", "versionType": "git" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "lessThan": "0f7baa82a24813cdad0b06a6f8f07e4824af5ed5", "status": "affected", "versionType": "git" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "lessThan": "dcf458120add64c96a6ef5cf719340453f6e6abf", "status": "affected", "versionType": "git" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "lessThan": "4fd34669558085bcb589aa2078a13b0ca79e360d", "status": "affected", "versionType": "git" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "lessThan": "34080db3e70ddf94c38512ad2331e3c3afca6cc1", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rds/ib_send.c" ], "versions": [ { "version": "2.6.37", "status": "affected" }, { "version": "0", "lessThan": "2.6.37", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a0148342badd8c9b2e46551766a27cb76c82e715" }, { "url": "https://git.kernel.org/stable/c/4dd262f875e87653df50b138de1390ab0628e6b7" }, { "url": "https://git.kernel.org/stable/c/6e4615164d185a26badb2f376a2449f4d174a5f0" }, { "url": "https://git.kernel.org/stable/c/0f22412a2f4fbbe0251c132abee045d15a90e5b6" }, { "url": "https://git.kernel.org/stable/c/0f7baa82a24813cdad0b06a6f8f07e4824af5ed5" }, { "url": "https://git.kernel.org/stable/c/dcf458120add64c96a6ef5cf719340453f6e6abf" }, { "url": "https://git.kernel.org/stable/c/4fd34669558085bcb589aa2078a13b0ca79e360d" }, { "url": "https://git.kernel.org/stable/c/34080db3e70ddf94c38512ad2331e3c3afca6cc1" } ], "title": "net/rds: fix NULL deref in rds_ib_send_cqe_handler() on masked atomic completion", "x_generator": { "engine": "bippy-1.2.0" } } } }