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    <lastBuildDate>Tue, 06 Oct 2026 07:04:26 +0000</lastBuildDate>
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      <title>CVE-2024-50095 — RDMA/mad: Improve handling of timed out WRs of mad agent</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2024-50095</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux, Siemens RUGGEDCOM RST2428P, Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family, Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;RDMA/mad: Improve handling of timed out WRs of mad agent&lt;/p&gt;
&lt;p&gt;Current timeout handler of mad agent acquires/releases mad_agent_priv
lock for every timed out WRs. This causes heavy locking contention
when higher no. of WRs are to be handled inside timeout handler.&lt;/p&gt;
&lt;p&gt;This leads to softlockup with below trace in some use cases where
rdma-cm path is used to establish connection between peer nodes&lt;/p&gt;
&lt;p&gt;Trace:
-----
 BUG: soft lockup - CPU#4 stuck for 26s! [kworker/u128:3:19767]
 CPU: 4 PID: 19767 Comm: kworker/u128:3 Kdump: loaded Tainted: G OE
     -------  ---  5.14.0-427.13.1.el9_4.x86_64 #1
 Hardware name: Dell Inc. PowerEdge R740/01YM03, BIOS 2.4.8 11/26/2019
 Workqueue: ib_mad1 timeout_sends [ib_core]
 RIP: 0010:__do_softirq+0x78/0x2ac
 RSP: 0018:ffffb253449e4f98 EFLAGS: 00000246
 RAX: 00000000ffffffff RBX: 0000000000000000 RCX: 000000000000001f
 RDX: 000000000000001d RSI: 000000003d1879ab RDI: fff363b66fd3a86b
 RBP: ffffb253604cbcd8 R08: 0000009065635f3b R09: 0000000000000000
 R10: 0000000000000040 R11: ffffb253449e4ff8 R12: 0000000000000000
 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040
 FS:  0000000000000000(0000) GS:ffff8caa1fc80000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00007fd9ec9db900 CR3: 0000000891934006 CR4: 00000000007706e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux, Siemens RUGGEDCOM RST2428P, Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family, Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;RDMA/mad: Improve handling of timed out WRs of mad agent&lt;/p&gt;
&lt;p&gt;Current timeout handler of mad agent acquires/releases mad_agent_priv
lock for every timed out WRs. This causes heavy locking contention
when higher no. of WRs are to be handled inside timeout handler.&lt;/p&gt;
&lt;p&gt;This leads to softlockup with below trace in some use cases where
rdma-cm path is used to establish connection between peer nodes&lt;/p&gt;
&lt;p&gt;Trace:
-----
 BUG: soft lockup - CPU#4 stuck for 26s! [kworker/u128:3:19767]
 CPU: 4 PID: 19767 Comm: kworker/u128:3 Kdump: loaded Tainted: G OE
     -------  ---  5.14.0-427.13.1.el9_4.x86_64 #1
 Hardware name: Dell Inc. PowerEdge R740/01YM03, BIOS 2.4.8 11/26/2019
 Workqueue: ib_mad1 timeout_sends [ib_core]
 RIP: 0010:__do_softirq+0x78/0x2ac
 RSP: 0018:ffffb253449e4f98 EFLAGS: 00000246
 RAX: 00000000ffffffff RBX: 0000000000000000 RCX: 000000000000001f
 RDX: 000000000000001d RSI: 000000003d1879ab RDI: fff363b66fd3a86b
 RBP: ffffb253604cbcd8 R08: 0000009065635f3b R09: 0000000000000000
 R10: 0000000000000040 R11: ffffb253449e4ff8 R12: 0000000000000000
 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040
 FS:  0000000000000000(0000) GS:ffff8caa1fc80000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00007fd9ec9db900 CR3: 0000000891934006 CR4: 00000000007706e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2024-50095</guid>
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