CVE-2026-52941None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: net/smc: avoid NULL deref of conn->lnk in smc_msg_event tracepoint The smc_msg_event tracepoint class, shared by smc_tx_sendmsg and smc_rx_recvmsg, unconditionally der…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
net/smc: avoid NULL deref of conn->lnk in smc_msg_event tracepoint
The smc_msg_event tracepoint class, shared by smc_tx_sendmsg and smc_rx_recvmsg, unconditionally dereferences smc->conn.lnk:
__string(name, smc->conn.lnk->ibname)
conn->lnk is only set for SMC-R; for SMC-D it is NULL. Other code on these paths already handles this (e.g. !conn->lnk in SMC_STAT_RMB_TX_SIZE_SMALL()). With the tracepoint enabled, the first sendmsg()/recvmsg() on an SMC-D socket crashes:
Oops: general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [...] RIP: 0010:strlen+0x1e/0xa0 Call Trace: trace_event_raw_event_smc_msg_event (net/smc/smc_tracepoint.h:44) smc_rx_recvmsg (net/smc/smc_rx.c:515) smc_recvmsg (net/smc/af_smc.c:2859) __sys_recvfrom (net/socket.c:2315) __x64_sys_recvfrom (net/socket.c:2326) do_syscall_64
The faulting address 0x3e0 is offsetof(struct smc_link, ibname), confirming the NULL ->lnk deref. Enabling the tracepoint requires root, but the trigger itself is unprivileged: socket(AF_SMC, ...) has no capability check, and SMC-D negotiation needs no admin step on s390 or on x86 with the loopback ISM device loaded.
Log an empty device name for SMC-D instead of dereferencing NULL.
Linux >= aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 < 68200112534bb2acd1d7117dc2d5c124868d866dLinux >= aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 < 720c76b930c52cd58f50eb6b10569d03dccc7959Linux >= aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 < b706d6d76a2a2793fe5ad0fbc2a75b6a460094efLinux >= aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 < d2ea0b8aef8746e147602eac87ca8538f4bc7e66Linux >= aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 < 561cf66fa9b6c86dfe4e687d2d1aeaaa6739917fLinux >= aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 < 7bf563badd37cb796df5477d2b78bb64148a1268Linux 5.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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