{"id":"CVE-2026-98524","title":"rds: ib: Clear the sg list when mapping an MR fails","summary":"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 failur…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 1be3211e6ac77adbb1eac01314d989d243b32c59","Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < c42d316163f89cd23de2f3e24558177a8c29bad8","Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 8dca3c81344532a7f05edb3d12f31f3009410a90","Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 49ba5ed0129906e0362c2e4b5e21c89b2a41e115","Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 4468df5bcdef959fd96494e9968f323561a45f4c","Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < e2ee0616260080376123997488b5cf8a3870b8d9","Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < b36d32f30c3f1e58e3a5ae79d0f52836a316b36e","Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 58eb1b3325edac42dc6df72c80962bd53a3c8ca7","Linux 4.6"],"published":"2026-10-18","updated":"2026-10-19","sourceUpdated":"2026-10-19T09:21:06.038Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98524","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"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T15:45:12.281Z","slug":"CVE-2026-98524","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 1be3211e6ac77adbb1eac01314d989d243b32c59`\n- `Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < c42d316163f89cd23de2f3e24558177a8c29bad8`\n- `Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 8dca3c81344532a7f05edb3d12f31f3009410a90`\n- `Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 49ba5ed0129906e0362c2e4b5e21c89b2a41e115`\n- `Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 4468df5bcdef959fd96494e9968f323561a45f4c`\n- `Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < e2ee0616260080376123997488b5cf8a3870b8d9`\n- `Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < b36d32f30c3f1e58e3a5ae79d0f52836a316b36e`\n- `Linux >= 1659185fb4d0025835eb2058a141f0746c5cab00 < 58eb1b3325edac42dc6df72c80962bd53a3c8ca7`\n- `Linux 4.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}