{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-52939", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-52939", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-06-24T07:14:28.622Z", "updatedAt": "2026-06-24T07:14:28.622Z", "importedAt": "2026-10-24T01:58:14.884Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net/rds: fix NULL deref in rds_ib_send_cqe_handler() on masked atomic completion", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "status": "affected", "versionType": "git", "lessThan": "a0148342badd8c9b2e46551766a27cb76c82e715" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "status": "affected", "versionType": "git", "lessThan": "4dd262f875e87653df50b138de1390ab0628e6b7" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "status": "affected", "versionType": "git", "lessThan": "6e4615164d185a26badb2f376a2449f4d174a5f0" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "status": "affected", "versionType": "git", "lessThan": "0f22412a2f4fbbe0251c132abee045d15a90e5b6" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "status": "affected", "versionType": "git", "lessThan": "0f7baa82a24813cdad0b06a6f8f07e4824af5ed5" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "status": "affected", "versionType": "git", "lessThan": "dcf458120add64c96a6ef5cf719340453f6e6abf" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "status": "affected", "versionType": "git", "lessThan": "4fd34669558085bcb589aa2078a13b0ca79e360d" }, { "version": "20c72bd5f5f902e5a8745d51573699605bf8d21c", "status": "affected", "versionType": "git", "lessThan": "34080db3e70ddf94c38512ad2331e3c3afca6cc1" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.37", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.37" }, { "version": "5.10.259", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.210", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.176", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.143", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.94", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.36", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.0.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.0.*" }, { "version": "7.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }