In the Linux kernel, the following vulnerability has been resolved:
net/smc: Transitional solution for clcsock race issue
We encountered a crash in smc_setsockopt() and it is caused by accessing smc->clcsock after clcsock was released.
BUG: kernel NULL pointer dereference, address: 0000000000000020 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53 RIP: 0010:smc_setsockopt+0x59/0x280 [smc] Call Trace: <TASK> __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e </TASK>
This patch tries to fix it by holding clcsock_release_lock and checking whether clcsock has already been released before access.
In case that a crash of the same reason happens in smc_getsockopt() or smc_switch_to_fallback(), this patch also checkes smc->clcsock in them too. And the caller of smc_switch_to_fallback() will identify whether fallback succeeds according to the return value.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | Jun 20, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 20, 2024 |
| Suse | — | Upgrade reiserfs-kmp-azureUpgrade kernel-rt-develUpgrade kernel-rt_debug-livepatch-develUpgrade cluster-md-kmp-azureUpgrade cluster-md-kmp-rtUpgrade ocfs2-kmp-azureUpgrade kernel-rt-livepatchUpgrade dlm-kmp-azureUpgrade ocfs2-kmp-rtUpgrade gfs2-kmp-rtUpgrade kernel-devel-rtUpgrade gfs2-kmp-azureUpgrade kernel-syms-azureUpgrade kernel-rt-livepatch-develUpgrade kernel-devel-azureUpgrade kernel-rt_debug-develUpgrade kernel-azureUpgrade kselftests-kmp-rtUpgrade kernel-rt_debug-vdsoUpgrade kernel-source-azureUpgrade kernel-rtUpgrade kernel-azure-livepatch-develUpgrade kselftests-kmp-azureUpgrade kernel-azure-extraUpgrade kernel-rt_debugUpgrade kernel-rt-extraUpgrade kernel-azure-vdsoUpgrade kernel-azure-develUpgrade kernel-rt-vdsoUpgrade dlm-kmp-rtUpgrade kernel-source-rtUpgrade kernel-syms-rtUpgrade reiserfs-kmp-rtUpgrade kernel-azure-optionalUpgrade kernel-rt-optional | Aug 9, 2024 | Jun 20, 2024 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Jun 20, 2024 |
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