CVE-2026-98069 (GCVE-0-2026-98069)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:24 – Updated: 2026-09-25 14:42
VLAI
Title
net/rds: acquire the fastpath locks in rds_conn_shutdown()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rds: acquire the fastpath locks in rds_conn_shutdown() rds_conn_shutdown() quiesces the transmit and receive-refill paths by waiting for RDS_IN_XMIT and RDS_RECV_REFILL to be sampled clear, and then runs the transport shutdown and rds_conn_path_reset(). Sampling the bits clear is not the same as owning them: the moment after the wait_event() returns, rds_send_xmit() can re-acquire RDS_IN_XMIT (or rds_ib_recv_refill() can re-acquire RDS_RECV_REFILL) and run concurrently with the teardown. The sender does recheck the connection state after taking the lock, but that recheck is a classic store-buffering pattern: teardown writes the state and reads the bit while the sender writes the bit and reads the state. 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 while the transport zeroes its rings (e.g. rds_ib_ring_init()) and rds_send_path_reset() rewrites the transmit state under it. Oracle UEK fixed the same class of crashes - a 14-year tail of BUG_ON()s in rds_ib_sub_signaled(), unexpected op-codes and NULL dereferences in rds_ib_send_cqe_handler() during failover testing - by making the teardown path *acquire* the fastpath bit locks instead of testing them ("rds: Make sure transmit path and connection tear-down does not run concurrently"). Ownership of a single word is decided by RMW atomicity, so no cross-variable ordering is needed. Do the same here: take both locks before calling the transport shutdown, hold them across rds_conn_path_reset(), and release them explicitly with a wake-up afterwards. Both are released with clear_bit_unlock(), so that the ring re-initialization done by the transport shutdown and the transmit state rewritten by rds_send_path_reset() are ordered before either bit is seen clear by the next acquire_in_xmit() or acquire_refill(). The fastpath users of these bits - rds_send_xmit() and rds_ib_recv_refill() - are trylock style and back off while teardown owns the locks, so no new lock dependency is introduced for them. rds_tcp_reset_callbacks() is different: since the previous patch it acquires RDS_IN_XMIT as well, and it blocks doing so, so its wait now spans the teardown instead of at most one send batch. That waiter runs from rds_tcp_accept_one() on the single-threaded krdsd workqueue and holds rds_tcp_accept_lock and t_conn_path_lock while it waits, so a duelling SYN accepted while its path is being torn down parks accept processing for the duration of the teardown - for TCP bounded by the (up to 5 s) drain loop in rds_tcp_conn_path_shutdown(). An IB path's drain in rds_ib_conn_path_shutdown() has no round cap, but no blocking waiter either: rds_tcp_reset_callbacks() is the only blocking acquirer of these bits and waits only on its own TCP path, and the fastpaths are trylock-and-back-off on both transports, so a long IB drain lengthens only that path's own quiesce. The window is narrow: the accept-side state check has to pass before the teardown moves the path to RDS_CONN_DISCONNECTING. Because krdsd is a single global workqueue, everything else queued there - accept processing for other connections and network namespaces, and the flush_workqueue(rds_wq) in rds_tcp_listen_stop() during namespace teardown - waits behind the parked accept worker for that time. It cannot deadlock, although the waits do point at each other: the teardown blocks until the bit's holder releases it, and the holder may be that krdsd accept worker. The holder finishes without needing anything the teardown owns: the sync cancels rds_tcp_reset_callbacks() issues target cp_send_w and cp_recv_w on the path's ordered cp_wq, whose only execution slot is occupied by the blocked cp_down_w itself, so they are pending at most and cancel without flushing - a reliance on cp_wq being ordered that is now noted next to those cancels (on ---truncated---
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0f4b1c7e89e699f588807a914ec6e6396c851a72 , < 7febb113795d5de5b690b208f4b0e64a5fad1201 (git)
Affected: 0f4b1c7e89e699f588807a914ec6e6396c851a72 , < 900e96c9749a06833801f60c393aa1d405ea226c (git)
Affected: 0f4b1c7e89e699f588807a914ec6e6396c851a72 , < 1fe627e5db5c3f53a9f9f9c8a66671755d306955 (git)
Affected: 0f4b1c7e89e699f588807a914ec6e6396c851a72 , < 813f3582ac7ae9f60f917937d54660e0952d5f2d (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.37
Unaffected: 0 , < 2.6.37 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rds/connection.c",
            "net/rds/ib_recv.c",
            "net/rds/send.c",
            "net/rds/tcp.c"
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              "status": "affected",
              "version": "0f4b1c7e89e699f588807a914ec6e6396c851a72",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "0f4b1c7e89e699f588807a914ec6e6396c851a72",
              "versionType": "git"
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rds/connection.c",
            "net/rds/ib_recv.c",
            "net/rds/send.c",
            "net/rds/tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "2.6.37"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
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                {
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                {
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                  "versionEndExcluding": "7.3-rc2",
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                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: acquire the fastpath locks in rds_conn_shutdown()\n\nrds_conn_shutdown() quiesces the transmit and receive-refill paths by\nwaiting for RDS_IN_XMIT and RDS_RECV_REFILL to be sampled clear, and\nthen runs the transport shutdown and rds_conn_path_reset().  Sampling\nthe bits clear is not the same as owning them: the moment after the\nwait_event() returns, rds_send_xmit() can re-acquire RDS_IN_XMIT (or\nrds_ib_recv_refill() can re-acquire RDS_RECV_REFILL) and run\nconcurrently with the teardown.\n\nThe sender does recheck the connection state after taking the lock,\nbut that recheck is a classic store-buffering pattern: teardown writes\nthe state and reads the bit while the sender writes the bit and reads\nthe state.  acquire_in_xmit() is only an acquire operation, so on\nweakly ordered architectures both sides can miss each other\u0027s write,\nand the transmit path then runs while the transport zeroes its rings\n(e.g. rds_ib_ring_init()) and rds_send_path_reset() rewrites the\ntransmit state under it.\n\nOracle UEK fixed the same class of crashes - a 14-year tail of\nBUG_ON()s in rds_ib_sub_signaled(), unexpected op-codes and NULL\ndereferences in rds_ib_send_cqe_handler() during failover testing -\nby making the teardown path *acquire* the fastpath bit locks instead\nof testing them (\"rds: Make sure transmit path and connection\ntear-down does not run concurrently\").  Ownership of a single word is\ndecided by RMW atomicity, so no cross-variable ordering is needed.\n\nDo the same here: take both locks before calling the transport\nshutdown, hold them across rds_conn_path_reset(), and release them\nexplicitly with a wake-up afterwards.  Both are released with\nclear_bit_unlock(), so that the ring re-initialization done by the\ntransport shutdown and the transmit state rewritten by\nrds_send_path_reset() are ordered before either bit is seen clear by\nthe next acquire_in_xmit() or acquire_refill().\n\nThe fastpath users of these bits - rds_send_xmit() and\nrds_ib_recv_refill() - are trylock style and back off while teardown\nowns the locks, so no new lock dependency is introduced for them.\nrds_tcp_reset_callbacks() is different: since the previous patch it\nacquires RDS_IN_XMIT as well, and it blocks doing so, so its wait now\nspans the teardown instead of at most one send batch.  That waiter\nruns from rds_tcp_accept_one() on the single-threaded krdsd workqueue\nand holds rds_tcp_accept_lock and t_conn_path_lock while it waits, so\na duelling SYN accepted while its path is being torn down parks\naccept processing for the duration of the teardown - for TCP bounded\nby the (up to 5 s) drain loop in rds_tcp_conn_path_shutdown().  An IB\npath\u0027s drain in rds_ib_conn_path_shutdown() has no round cap, but no\nblocking waiter either: rds_tcp_reset_callbacks() is the only blocking\nacquirer of these bits and waits only on its own TCP path, and the\nfastpaths are trylock-and-back-off on both transports, so a long IB\ndrain lengthens only that path\u0027s own quiesce.  The\nwindow is narrow: the accept-side state check has to pass before the\nteardown moves the path to RDS_CONN_DISCONNECTING.\n\nBecause krdsd is a single global workqueue, everything else queued\nthere - accept processing for other connections and network\nnamespaces, and the flush_workqueue(rds_wq) in rds_tcp_listen_stop()\nduring namespace teardown - waits behind the parked accept worker for\nthat time.  It cannot deadlock, although the waits do point at each\nother: the teardown blocks until the bit\u0027s holder releases it, and\nthe holder may be that krdsd accept worker.  The holder finishes\nwithout needing anything the teardown owns: the sync cancels\nrds_tcp_reset_callbacks() issues target cp_send_w and cp_recv_w on\nthe path\u0027s ordered cp_wq, whose only execution slot is occupied by\nthe blocked cp_down_w itself, so they are pending at most and cancel\nwithout flushing - a reliance on cp_wq being ordered that is now\nnoted next to those cancels (on \n---truncated---"
        }
      ],
      "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 - A remote RDS/TCP peer on port 16385 drives both sides of the race: RDS ping messages make rds_recv_incoming() call rds_send_pong() and so rds_send_xmit(), and the peer\u0027s own FIN/RST reaches rds_tcp_state_change() and then rds_conn_path_drop(), which queues rds_conn_shutdown(). The damaged state is that connection\u0027s transmit state and TCP socket.\nAC:H - The attacker can start sends and teardowns at will, but the sender only overlaps the teardown if the test_bit() wait in rds_conn_shutdown() and the state recheck in rds_send_xmit() both miss each other\u0027s store. That needs a weakly ordered CPU and a narrow reordering window the attacker cannot control.\nPR:N - rds_tcp_accept_one() accepts RDS/TCP connections from any peer address with no authentication, so pings and connection drops need no credentials. A local user can also reach it without privilege, since AF_RDS socket creation has no capability check and SO_RDS_TRANSPORT autoloads rds_tcp.\nUI:N - No victim action is needed. The attacker sends the pings and resets the connection themselves.\nS:U - The race and its memory corruption stay inside the kernel\u0027s own security authority. No guest/host or other boundary is crossed.\nC:H - rds_send_xmit()/rds_tcp_xmit() can keep using tc-\u003et_sock after rds_tcp_conn_path_shutdown() has called sock_release() on it, and can keep using cp_xmit_rm while rds_send_path_reset() rewrites it. Both are use-after-free on socket and message objects, which could be groomed into kernel memory disclosure.\nI:H - The transmit path writes through a freed struct socket/sock, and through transmit and ring state (IB rings zeroed by rds_ib_ring_init()) that the teardown is rewriting at the same time. That is a heap memory-corruption primitive.\nA:H - Losing the race crashes the kernel: the commit cites BUG_ON()s in rds_ib_sub_signaled() and NULL dereferences in rds_ib_send_cqe_handler(), and the TCP path can dereference a released socket."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-25T14:42:00.173Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/7febb113795d5de5b690b208f4b0e64a5fad1201"
        },
        {
          "url": "https://git.kernel.org/stable/c/900e96c9749a06833801f60c393aa1d405ea226c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fe627e5db5c3f53a9f9f9c8a66671755d306955"
        },
        {
          "url": "https://git.kernel.org/stable/c/813f3582ac7ae9f60f917937d54660e0952d5f2d"
        }
      ],
      "title": "net/rds: acquire the fastpath locks in rds_conn_shutdown()",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98069",
    "datePublished": "2026-09-25T10:24:10.887Z",
    "dateReserved": "2026-09-25T10:19:56.074Z",
    "dateUpdated": "2026-09-25T14:42:00.173Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/rds/connection.c",
                  "net/rds/ib_recv.c",
                  "net/rds/send.c",
                  "net/rds/tcp.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
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                    "versionType": "git"
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                  {
                    "lessThan": "1fe627e5db5c3f53a9f9f9c8a66671755d306955",
                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
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                    "status": "affected",
                    "version": "0f4b1c7e89e699f588807a914ec6e6396c851a72",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/rds/connection.c",
                  "net/rds/ib_recv.c",
                  "net/rds/send.c",
                  "net/rds/tcp.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.37"
                  },
                  {
                    "lessThan": "2.6.37",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.111",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.7",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: acquire the fastpath locks in rds_conn_shutdown()\n\nrds_conn_shutdown() quiesces the transmit and receive-refill paths by\nwaiting for RDS_IN_XMIT and RDS_RECV_REFILL to be sampled clear, and\nthen runs the transport shutdown and rds_conn_path_reset().  Sampling\nthe bits clear is not the same as owning them: the moment after the\nwait_event() returns, rds_send_xmit() can re-acquire RDS_IN_XMIT (or\nrds_ib_recv_refill() can re-acquire RDS_RECV_REFILL) and run\nconcurrently with the teardown.\n\nThe sender does recheck the connection state after taking the lock,\nbut that recheck is a classic store-buffering pattern: teardown writes\nthe state and reads the bit while the sender writes the bit and reads\nthe state.  acquire_in_xmit() is only an acquire operation, so on\nweakly ordered architectures both sides can miss each other\u0027s write,\nand the transmit path then runs while the transport zeroes its rings\n(e.g. rds_ib_ring_init()) and rds_send_path_reset() rewrites the\ntransmit state under it.\n\nOracle UEK fixed the same class of crashes - a 14-year tail of\nBUG_ON()s in rds_ib_sub_signaled(), unexpected op-codes and NULL\ndereferences in rds_ib_send_cqe_handler() during failover testing -\nby making the teardown path *acquire* the fastpath bit locks instead\nof testing them (\"rds: Make sure transmit path and connection\ntear-down does not run concurrently\").  Ownership of a single word is\ndecided by RMW atomicity, so no cross-variable ordering is needed.\n\nDo the same here: take both locks before calling the transport\nshutdown, hold them across rds_conn_path_reset(), and release them\nexplicitly with a wake-up afterwards.  Both are released with\nclear_bit_unlock(), so that the ring re-initialization done by the\ntransport shutdown and the transmit state rewritten by\nrds_send_path_reset() are ordered before either bit is seen clear by\nthe next acquire_in_xmit() or acquire_refill().\n\nThe fastpath users of these bits - rds_send_xmit() and\nrds_ib_recv_refill() - are trylock style and back off while teardown\nowns the locks, so no new lock dependency is introduced for them.\nrds_tcp_reset_callbacks() is different: since the previous patch it\nacquires RDS_IN_XMIT as well, and it blocks doing so, so its wait now\nspans the teardown instead of at most one send batch.  That waiter\nruns from rds_tcp_accept_one() on the single-threaded krdsd workqueue\nand holds rds_tcp_accept_lock and t_conn_path_lock while it waits, so\na duelling SYN accepted while its path is being torn down parks\naccept processing for the duration of the teardown - for TCP bounded\nby the (up to 5 s) drain loop in rds_tcp_conn_path_shutdown().  An IB\npath\u0027s drain in rds_ib_conn_path_shutdown() has no round cap, but no\nblocking waiter either: rds_tcp_reset_callbacks() is the only blocking\nacquirer of these bits and waits only on its own TCP path, and the\nfastpaths are trylock-and-back-off on both transports, so a long IB\ndrain lengthens only that path\u0027s own quiesce.  The\nwindow is narrow: the accept-side state check has to pass before the\nteardown moves the path to RDS_CONN_DISCONNECTING.\n\nBecause krdsd is a single global workqueue, everything else queued\nthere - accept processing for other connections and network\nnamespaces, and the flush_workqueue(rds_wq) in rds_tcp_listen_stop()\nduring namespace teardown - waits behind the parked accept worker for\nthat time.  It cannot deadlock, although the waits do point at each\nother: the teardown blocks until the bit\u0027s holder releases it, and\nthe holder may be that krdsd accept worker.  The holder finishes\nwithout needing anything the teardown owns: the sync cancels\nrds_tcp_reset_callbacks() issues target cp_send_w and cp_recv_w on\nthe path\u0027s ordered cp_wq, whose only execution slot is occupied by\nthe blocked cp_down_w itself, so they are pending at most and cancel\nwithout flushing - a reliance on cp_wq being ordered that is now\nnoted next to those cancels (on \n---truncated---"
          }
        ],
        "id": "CVE-2026-98069",
        "lastModified": "2026-09-25T15:18:05.267",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-25T11:17:36.043",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1fe627e5db5c3f53a9f9f9c8a66671755d306955"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7febb113795d5de5b690b208f4b0e64a5fad1201"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/813f3582ac7ae9f60f917937d54660e0952d5f2d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/900e96c9749a06833801f60c393aa1d405ea226c"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.