CVE-2026-98524 (GCVE-0-2026-98524)
Vulnerability from cvelistv5
Published
2026-10-18 15:17
Modified
2026-10-24 14:09
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: rds: ib: Clear the sg list when mapping an MR fails rds_ib_map_frmr() stores the caller's scatterlist in the MR before DMA mapping and registration can fail. On failure, __rds_rdma_map() unpins the pages and frees the scatterlist, but rds_ib_free_frmr() can still return the MR to the pool with the stale pointer set. This leaves the pool with a dangling scatterlist and can lead to local privilege escalation. KASAN detects the resulting use-after-free when the MR is later torn down: BUG: KASAN: slab-use-after-free in __rds_ib_teardown_mr Read of size 8 Call Trace: __rds_ib_teardown_mr rds_ib_unreg_frmr rds_ib_flush_mr_pool rds_ib_flush_mrs rds_free_mr rds_setsockopt Store the scatterlist in the MR only after DMA mapping succeeds. If DMA mapping fails, return directly while the MR fields remain clear; the caller keeps ownership of the scatterlist and its pinned pages. If a later registration step fails, unmap the scatterlist and clear the MR fields before returning.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1659185fb4d0025835eb2058a141f0746c5cab00
Version: 1659185fb4d0025835eb2058a141f0746c5cab00
Version: 1659185fb4d0025835eb2058a141f0746c5cab00
Version: 1659185fb4d0025835eb2058a141f0746c5cab00
Version: 1659185fb4d0025835eb2058a141f0746c5cab00
Version: 1659185fb4d0025835eb2058a141f0746c5cab00
Version: 1659185fb4d0025835eb2058a141f0746c5cab00
Version: 1659185fb4d0025835eb2058a141f0746c5cab00
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rds/ib_frmr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1be3211e6ac77adbb1eac01314d989d243b32c59",
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "versionType": "git"
            },
            {
              "lessThan": "c42d316163f89cd23de2f3e24558177a8c29bad8",
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "versionType": "git"
            },
            {
              "lessThan": "8dca3c81344532a7f05edb3d12f31f3009410a90",
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "versionType": "git"
            },
            {
              "lessThan": "49ba5ed0129906e0362c2e4b5e21c89b2a41e115",
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "versionType": "git"
            },
            {
              "lessThan": "4468df5bcdef959fd96494e9968f323561a45f4c",
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "versionType": "git"
            },
            {
              "lessThan": "e2ee0616260080376123997488b5cf8a3870b8d9",
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "versionType": "git"
            },
            {
              "lessThan": "b36d32f30c3f1e58e3a5ae79d0f52836a316b36e",
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "versionType": "git"
            },
            {
              "lessThan": "58eb1b3325edac42dc6df72c80962bd53a3c8ca7",
              "status": "affected",
              "version": "1659185fb4d0025835eb2058a141f0746c5cab00",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rds/ib_frmr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.271",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.55",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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\u0027s 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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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\u0027s 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-\u003esg 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:09:17.970Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98524",
    "datePublished": "2026-10-18T15:17:41.420Z",
    "dateReserved": "2026-09-25T10:25:14.355Z",
    "dateUpdated": "2026-10-24T14:09:17.970Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.