CVE-2026-43469 (GCVE-0-2026-43469)
Vulnerability from cvelistv5
Published
2026-05-08 14:22
Modified
2026-10-19 19:26
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Decrement re_receiving on the early exit paths In the event that rpcrdma_post_recvs() fails to create a work request (due to memory allocation failure, say) or otherwise exits early, we should decrement ep->re_receiving before returning. Otherwise we will hang in rpcrdma_xprt_drain() as re_receiving will never reach zero and the completion will never be triggered. On a system with high memory pressure, this can appear as the following hung task: INFO: task kworker/u385:17:8393 blocked for more than 122 seconds. Tainted: G S E 6.19.0 #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u385:17 state:D stack:0 pid:8393 tgid:8393 ppid:2 task_flags:0x4248060 flags:0x00080000 Workqueue: xprtiod xprt_autoclose [sunrpc] Call Trace: <TASK> __schedule+0x48b/0x18b0 ? ib_post_send_mad+0x247/0xae0 [ib_core] schedule+0x27/0xf0 schedule_timeout+0x104/0x110 __wait_for_common+0x98/0x180 ? __pfx_schedule_timeout+0x10/0x10 wait_for_completion+0x24/0x40 rpcrdma_xprt_disconnect+0x444/0x460 [rpcrdma] xprt_rdma_close+0x12/0x40 [rpcrdma] xprt_autoclose+0x5f/0x120 [sunrpc] process_one_work+0x191/0x3e0 worker_thread+0x2e3/0x420 ? __pfx_worker_thread+0x10/0x10 kthread+0x10d/0x230 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x273/0x2b0 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30
References
Impacted products
Vendor Product Version
Linux Linux Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
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    "datePublished": "2026-05-08T14:22:29.550Z",
    "dateReserved": "2026-05-01T14:12:56.011Z",
    "dateUpdated": "2026-10-19T19:26:37.543Z",
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A malicious or compromised remote NFS/RDMA server can influence the receive repost path via reply traffic and credit grants.\\nAC:L - The trigger is a deterministic accounting bug on early exits from receive reposting, and a peer can drive reply bursts, high credit grants, and disconnect/reconnect behavior to reach the path. Although memory pressure can help expose one early exit, the rule requires choosing the higher severity option when uncertain.\\nPR:N - The remote peer sending RDMA replies does not need privileges on the affected client. The client must already be using an NFS/RDMA transport, but the attacker-side protocol traffic itself is not gated by local kernel privileges.\\nUI:N - In a reasonable deployed scenario, the client already has an active NFS/RDMA mount and normal RPC traffic reaches the vulnerable receive path without a further victim action. Exploitation can be driven by the remote peer during ordinary mounted filesystem operation.\\nS:U - The effect is confined to the Linux kernel/RPC transport on the same host. It does not cross a separate security authority such as a VM, IOMMU, or sandbox boundary.\\nC:N - The bug is a leaked receive-drain accounting reference, not memory corruption or an information disclosure primitive. The investigated paths indicate a hang in disconnect/drain handling rather than exposure of kernel memory.\\nI:N - The issue does not provide data modification, arbitrary write, or control-flow manipulation. It only prevents receive-drain completion after the counter is left elevated.\\nA:H - The leaked re_receiving count can make rpcrdma_xprt_drain wait forever, producing stuck xprtiod/autoclose work and hung kernel tasks. This is a kernel-level availability failure for the affected NFS/RDMA transport and can persist until recovery or reboot.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"15788d1d1077ebe029c48842c738876516d85076\", \"lessThan\": \"7ea69259a60a364f56cf4aa9e2eafb588d1c762b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"15788d1d1077ebe029c48842c738876516d85076\", \"lessThan\": \"8cb6b5d8296b1f99a8d36849901ebabfe3f749db\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"15788d1d1077ebe029c48842c738876516d85076\", \"lessThan\": \"74c39a47856bddcde7874f2196a00143b5cd0af9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"15788d1d1077ebe029c48842c738876516d85076\", \"lessThan\": \"49f53ee4e25297d886f14e31f355ad1c2735ddfb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"15788d1d1077ebe029c48842c738876516d85076\", \"lessThan\": \"8127b5fec04757c2a41ed65bca0b3266968efd3b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"15788d1d1077ebe029c48842c738876516d85076\", \"lessThan\": \"dc3ebd7e2d73dbd4d317785735ffa6c4a6384ddf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"15788d1d1077ebe029c48842c738876516d85076\", \"lessThan\": \"7b6275c80a0c81c5f8943272292dfe67730ce849\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sunrpc/xprtrdma/verbs.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.203\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.167\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.130\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.78\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sunrpc/xprtrdma/verbs.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7ea69259a60a364f56cf4aa9e2eafb588d1c762b\"}, {\"url\": \"https://git.kernel.org/stable/c/8cb6b5d8296b1f99a8d36849901ebabfe3f749db\"}, {\"url\": \"https://git.kernel.org/stable/c/74c39a47856bddcde7874f2196a00143b5cd0af9\"}, {\"url\": \"https://git.kernel.org/stable/c/49f53ee4e25297d886f14e31f355ad1c2735ddfb\"}, {\"url\": \"https://git.kernel.org/stable/c/8127b5fec04757c2a41ed65bca0b3266968efd3b\"}, {\"url\": \"https://git.kernel.org/stable/c/dc3ebd7e2d73dbd4d317785735ffa6c4a6384ddf\"}, {\"url\": \"https://git.kernel.org/stable/c/7b6275c80a0c81c5f8943272292dfe67730ce849\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxprtrdma: Decrement re_receiving on the early exit paths\\n\\nIn the event that rpcrdma_post_recvs() fails to create a work request\\n(due to memory allocation failure, say) or otherwise exits early, we\\nshould decrement ep-\u003ere_receiving before returning. Otherwise we will\\nhang in rpcrdma_xprt_drain() as re_receiving will never reach zero and\\nthe completion will never be triggered.\\n\\nOn a system with high memory pressure, this can appear as the following\\nhung task:\\n\\n    INFO: task kworker/u385:17:8393 blocked for more than 122 seconds.\\n          Tainted: G S          E       6.19.0 #3\\n    \\\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\\\" disables this message.\\n    task:kworker/u385:17 state:D stack:0     pid:8393  tgid:8393  ppid:2      task_flags:0x4248060 flags:0x00080000\\n    Workqueue: xprtiod xprt_autoclose [sunrpc]\\n    Call Trace:\\n     \u003cTASK\u003e\\n     __schedule+0x48b/0x18b0\\n     ? ib_post_send_mad+0x247/0xae0 [ib_core]\\n     schedule+0x27/0xf0\\n     schedule_timeout+0x104/0x110\\n     __wait_for_common+0x98/0x180\\n     ? __pfx_schedule_timeout+0x10/0x10\\n     wait_for_completion+0x24/0x40\\n     rpcrdma_xprt_disconnect+0x444/0x460 [rpcrdma]\\n     xprt_rdma_close+0x12/0x40 [rpcrdma]\\n     xprt_autoclose+0x5f/0x120 [sunrpc]\\n     process_one_work+0x191/0x3e0\\n     worker_thread+0x2e3/0x420\\n     ? __pfx_worker_thread+0x10/0x10\\n     kthread+0x10d/0x230\\n     ? __pfx_kthread+0x10/0x10\\n     ret_from_fork+0x273/0x2b0\\n     ? __pfx_kthread+0x10/0x10\\n     ret_from_fork_asm+0x1a/0x30\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.203\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.167\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.130\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.78\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.19\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.9\", \"versionStartIncluding\": \"5.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"5.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:28:10.739Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43469\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:26:37.543Z\", \"dateReserved\": \"2026-05-01T14:12:56.011Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-08T14:22:29.550Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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