CVE-2026-98070 (GCVE-0-2026-98070)
Vulnerability from cvelistv5
Published
2026-09-25 10:24
Modified
2026-10-19 09:13
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks() rds_tcp_reset_callbacks() quiesces the transmit path by setting the path state to RDS_CONN_RESETTING and then waiting for RDS_IN_XMIT to be sampled clear before swapping the underlying socket and calling rds_send_path_reset(). Sampling the bit clear is not the same as owning it: rds_send_xmit() can re-acquire RDS_IN_XMIT right after the wait_event() returns. Its state recheck after taking the lock is a store-buffering pattern (the resetter writes the state and reads the bit, the sender writes the bit and reads the state) and acquire_in_xmit() is only an acquire operation, so on weakly ordered architectures both sides can miss each other's write and the transmit path then runs concurrently with rds_send_path_reset() rewriting cp_xmit_* state - which is exactly what the comment above rds_send_path_reset() tells its callers to prevent. Take the lock instead, hold it across the socket swap and rds_send_path_reset(), and release it with a wake-up at the end. The lock-ordering constraint documented above the wait still holds: the lock is acquired before lock_sock(), so a sender inside tcp_sendmsg() can never be waited on while we hold the socket lock. Two details of the old code go away with the same change: - t_sock is now read only after the lock is acquired. The old code cached it before waiting; the teardown in rds_conn_shutdown() releases that socket and clears t_sock, so a pointer cached before the wait can be stale by the time the accept path resumes. Reading it under RDS_IN_XMIT is what makes the exclusion complete once the teardown owns the same lock, which the next patch arranges; until then the teardown still only samples the bit, and the two paths remain as exposed to each other as they are today. - The old !osock early path called rds_send_path_reset() with no serialization at all. It now runs under the lock like the normal path. The conditional RDS_CONN_RESETTING transition of the previous patch happens before the socket check either way: a path found without a socket is either still connecting (its reconnect worker blocked on t_conn_path_lock) and legitimately goes RESETTING -> UP on the new socket, or it has been torn down meanwhile and is dropped. The in-function comment describing the old wait-based quiesce is rewritten to describe the lock-based one, and the stale block comment above the function (which still described a return value and an incomplete list of t_sock writers) is refreshed to name all four writers - the connect, accept, teardown and swap paths - and what serializes each of them.
References
Impacted products
Vendor Product Version
Linux Linux Version: 335b48d980f631fbc5b233cbb3625ac0c86d67cb
Version: 335b48d980f631fbc5b233cbb3625ac0c86d67cb
Version: 335b48d980f631fbc5b233cbb3625ac0c86d67cb
Version: 335b48d980f631fbc5b233cbb3625ac0c86d67cb
Version: 335b48d980f631fbc5b233cbb3625ac0c86d67cb
Version: 335b48d980f631fbc5b233cbb3625ac0c86d67cb
Version: 335b48d980f631fbc5b233cbb3625ac0c86d67cb
Version: 335b48d980f631fbc5b233cbb3625ac0c86d67cb
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{
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          "programFiles": [
            "net/rds/tcp.c"
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          "vendor": "Linux",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()\n\nrds_tcp_reset_callbacks() quiesces the transmit path by setting the\npath state to RDS_CONN_RESETTING and then waiting for RDS_IN_XMIT to\nbe sampled clear before swapping the underlying socket and calling\nrds_send_path_reset().\n\nSampling the bit clear is not the same as owning it: rds_send_xmit()\ncan re-acquire RDS_IN_XMIT right after the wait_event() returns.  Its\nstate recheck after taking the lock is a store-buffering pattern (the\nresetter writes the state and reads the bit, the sender writes the\nbit and reads the state) and acquire_in_xmit() is only an acquire\noperation, so on weakly ordered architectures both sides can miss\neach other\u0027s write and the transmit path then runs concurrently with\nrds_send_path_reset() rewriting cp_xmit_* state - which is exactly\nwhat the comment above rds_send_path_reset() tells its callers to\nprevent.\n\nTake the lock instead, hold it across the socket swap and\nrds_send_path_reset(), and release it with a wake-up at the end.  The\nlock-ordering constraint documented above the wait still holds: the\nlock is acquired before lock_sock(), so a sender inside tcp_sendmsg()\ncan never be waited on while we hold the socket lock.\n\nTwo details of the old code go away with the same change:\n\n - t_sock is now read only after the lock is acquired.  The old code\n   cached it before waiting; the teardown in rds_conn_shutdown()\n   releases that socket and clears t_sock, so a pointer cached before\n   the wait can be stale by the time the accept path resumes.  Reading\n   it under RDS_IN_XMIT is what makes the exclusion complete once the\n   teardown owns the same lock, which the next patch arranges; until\n   then the teardown still only samples the bit, and the two paths\n   remain as exposed to each other as they are today.\n\n - The old !osock early path called rds_send_path_reset() with no\n   serialization at all.  It now runs under the lock like the normal\n   path.  The conditional RDS_CONN_RESETTING transition of the\n   previous patch happens before the socket check either way: a path\n   found without a socket is either still connecting (its reconnect\n   worker blocked on t_conn_path_lock) and legitimately goes\n   RESETTING -\u003e UP on the new socket, or it has been torn down\n   meanwhile and is dropped.\n\nThe in-function comment describing the old wait-based quiesce is\nrewritten to describe the lock-based one, and the stale block comment\nabove the function (which still described a return value and an\nincomplete list of t_sock writers) is refreshed to name all four\nwriters - the connect, accept, teardown and swap paths - and what\nserializes each of them."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - rds_tcp_reset_callbacks() runs when a remote peer\u0027s TCP SYN to the RDS/TCP listener is accepted by rds_tcp_accept_one() while the local path already has t_sock set (the duelling-SYN case). The peer\u0027s routable TCP connection is what sets off the unsynchronized socket swap and rds_send_path_reset().\nAC:H - The attacker must win a narrow store-buffering race between the resetter\u0027s test_bit(RDS_IN_XMIT) and rds_send_xmit()\u0027s acquire_in_xmit()/state recheck, which only fails on weakly ordered CPUs. It also needs a duelling SYN that arrives while the local path is still CONNECTING, which the attacker cannot fully control.\nPR:N - The RDS/TCP listener accepts incoming connections with no authentication. The accept path through rds_tcp_accept_one() into rds_tcp_reset_callbacks() needs only a reachable IP address and TCP port.\nUI:N - No local user action is needed. The reset path runs from the listen socket\u0027s data_ready callback and accept worker, and rds_send_xmit() is driven by the send worker or by pongs to peer pings.\nS:U - The corruption stays inside kernel memory under a single security authority. Crossing no VM or hardware isolation boundary.\nC:H - rds_send_path_reset() puts cp_xmit_rm and zeroes the cp_xmit_* offsets while a concurrent rds_send_xmit() still dereferences that rds_message. This is a use-after-free, and a stale osock cached before the wait can be released twice. Reclaiming the freed object could leak kernel memory.\nI:H - The use-after-free of the rds_message and of the stale socket, plus the torn cp_xmit_* transmit state, corrupt kernel heap objects that could be reclaimed and used for controlled writes.\nA:H - A sender using a freed cp_xmit_rm, or a double sock_release() of the stale osock, will oops or panic the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:13:19.953Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/670af4e4a4de5e6bb5daee3838485571a0caa5fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/830a2e21b200c6b6fdccc63dd3f23932bf7a894b"
        },
        {
          "url": "https://git.kernel.org/stable/c/a05790cb4ff03f797d76906990b148d83f63e7a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/d184e6dd4b8f3c20c018595fd09795a66b46c8ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/d625112564c3e980e02504270222b49b82690cee"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e4c3b7844c906c7097b4cfedd9dd1f48c9a6a92"
        },
        {
          "url": "https://git.kernel.org/stable/c/062d9e008c67289e8e1b221ecdd8f9d60566d012"
        },
        {
          "url": "https://git.kernel.org/stable/c/02c5f9dc2efd823e061954d564ce00bacd1bebeb"
        }
      ],
      "title": "net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98070",
    "datePublished": "2026-09-25T10:24:11.481Z",
    "dateReserved": "2026-09-25T10:19:56.074Z",
    "dateUpdated": "2026-10-19T09:13:19.953Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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