{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98524", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.355Z", "datePublished": "2026-10-18T15:17:41.420Z", "dateUpdated": "2026-10-24T14:09:17.970Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:09:17.970Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: Clear the sg list when mapping an MR fails\n\nrds_ib_map_frmr() stores the caller's scatterlist in the MR before DMA\nmapping and registration can fail. On failure, __rds_rdma_map() unpins\nthe pages and frees the scatterlist, but rds_ib_free_frmr() can still\nreturn the MR to the pool with the stale pointer set.\n\nThis leaves the pool with a dangling scatterlist and can lead to local\nprivilege escalation. KASAN detects the resulting use-after-free when the\nMR is later torn down:\n\nBUG: KASAN: slab-use-after-free in __rds_ib_teardown_mr\nRead of size 8\n\nCall Trace:\n __rds_ib_teardown_mr\n rds_ib_unreg_frmr\n rds_ib_flush_mr_pool\n rds_ib_flush_mrs\n rds_free_mr\n rds_setsockopt\n\nStore the scatterlist in the MR only after DMA mapping succeeds. If DMA\nmapping fails, return directly while the MR fields remain clear; the caller\nkeeps ownership of the scatterlist and its pinned pages. If a later\nregistration step fails, unmap the scatterlist and clear the MR fields\nbefore returning." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The attacker reaches patched rds_ib_map_frmr() through sendmsg() with a local RDS_CMSG_RDMA_MAP control message; no RDS packet field from a remote peer supplies the scatterlist or faulty ownership state.\nAC:L - On HNS hardware, the attacker can start an outgoing RDS connection and retry sendmsg() while its QP is RESET/INIT/RTR; check_send_valid() makes hns_roce_v2_post_send() return -EINVAL to rds_ib_post_reg_frmr(), creating the required failure.\nPR:L - rds_create(), rds_bind(), and rds_sendmsg() impose no capability or authentication check, and __rds_rdma_map() accepts an unprivileged process whenever can_do_mlock() sees a nonzero RLIMIT_MEMLOCK; RDS/IB merely requires the host's initial network namespace.\nUI:N - The attacking process performs both RDS_CMSG_RDMA_MAP and the zero-cookie setsockopt(SOL_RDS, RDS_FREE_MR) that calls rds_ib_flush_mrs(); no victim action is required.\nS:U - The stale ibmr->sg is consumed by __rds_ib_teardown_mr() within the host kernel, so exploitation elevates authority inside that same kernel rather than crossing a VM, IOMMU, or other security boundary.\nC:H - __rds_ib_teardown_mr() obtains page pointers with sg_page() from a freed, reclaimable scatterlist; attacker-controlled reclamation and the subsequent invalid free can enable kernel-memory compromise and disclosure.\nI:H - Teardown passes page pointers taken from the stale scatterlist to unpin_user_pages_dirty_lock() and then kfree()s the already-freed or reallocated array, enabling page-refcount and heap corruption usable for arbitrary writes or control-flow takeover.\nA:H - The observed slab use-after-free occurs in __rds_ib_teardown_mr(); dereferencing an invalid sg_page(), unpinning the resulting bogus page, or freeing the dangling scatterlist can produce a kernel oops or panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rds/ib_frmr.c" ], "versions": [ { "version": "1659185fb4d0025835eb2058a141f0746c5cab00", "lessThan": "1be3211e6ac77adbb1eac01314d989d243b32c59", "status": "affected", "versionType": "git" }, { "version": "1659185fb4d0025835eb2058a141f0746c5cab00", "lessThan": "c42d316163f89cd23de2f3e24558177a8c29bad8", "status": "affected", "versionType": "git" }, { "version": "1659185fb4d0025835eb2058a141f0746c5cab00", "lessThan": "8dca3c81344532a7f05edb3d12f31f3009410a90", "status": "affected", "versionType": "git" }, { "version": "1659185fb4d0025835eb2058a141f0746c5cab00", "lessThan": "49ba5ed0129906e0362c2e4b5e21c89b2a41e115", "status": "affected", "versionType": "git" }, { "version": "1659185fb4d0025835eb2058a141f0746c5cab00", "lessThan": "4468df5bcdef959fd96494e9968f323561a45f4c", "status": "affected", "versionType": "git" }, { "version": "1659185fb4d0025835eb2058a141f0746c5cab00", "lessThan": "e2ee0616260080376123997488b5cf8a3870b8d9", "status": "affected", "versionType": "git" }, { "version": "1659185fb4d0025835eb2058a141f0746c5cab00", "lessThan": "b36d32f30c3f1e58e3a5ae79d0f52836a316b36e", "status": "affected", "versionType": "git" }, { "version": "1659185fb4d0025835eb2058a141f0746c5cab00", "lessThan": "58eb1b3325edac42dc6df72c80962bd53a3c8ca7", "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_frmr.c" ], "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "4.6", "versionEndExcluding": "5.10.271" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1be3211e6ac77adbb1eac01314d989d243b32c59" }, { "url": "https://git.kernel.org/stable/c/c42d316163f89cd23de2f3e24558177a8c29bad8" }, { "url": "https://git.kernel.org/stable/c/8dca3c81344532a7f05edb3d12f31f3009410a90" }, { "url": "https://git.kernel.org/stable/c/49ba5ed0129906e0362c2e4b5e21c89b2a41e115" }, { "url": "https://git.kernel.org/stable/c/4468df5bcdef959fd96494e9968f323561a45f4c" }, { "url": "https://git.kernel.org/stable/c/e2ee0616260080376123997488b5cf8a3870b8d9" }, { "url": "https://git.kernel.org/stable/c/b36d32f30c3f1e58e3a5ae79d0f52836a316b36e" }, { "url": "https://git.kernel.org/stable/c/58eb1b3325edac42dc6df72c80962bd53a3c8ca7" } ], "title": "rds: ib: Clear the sg list when mapping an MR fails", "x_generator": { "engine": "bippy-1.2.0" } } } }