{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52941","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.370Z","datePublished":"2026-06-24T07:14:29.943Z","dateUpdated":"2026-06-24T07:14:29.943Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-24T07:14:29.943Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: avoid NULL deref of conn->lnk in smc_msg_event tracepoint\n\nThe smc_msg_event tracepoint class, shared by smc_tx_sendmsg and\nsmc_rx_recvmsg, unconditionally dereferences smc->conn.lnk:\n\n\t__string(name, smc->conn.lnk->ibname)\n\nconn->lnk is only set for SMC-R; for SMC-D it is NULL. Other code on\nthese paths already handles this (e.g. !conn->lnk in\nSMC_STAT_RMB_TX_SIZE_SMALL()). With the tracepoint enabled, the first\nsendmsg()/recvmsg() on an SMC-D socket crashes:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: null-ptr-deref in range [...]\n  RIP: 0010:strlen+0x1e/0xa0\n  Call Trace:\n   trace_event_raw_event_smc_msg_event (net/smc/smc_tracepoint.h:44)\n   smc_rx_recvmsg (net/smc/smc_rx.c:515)\n   smc_recvmsg (net/smc/af_smc.c:2859)\n   __sys_recvfrom (net/socket.c:2315)\n   __x64_sys_recvfrom (net/socket.c:2326)\n   do_syscall_64\n\nThe faulting address 0x3e0 is offsetof(struct smc_link, ibname),\nconfirming the NULL ->lnk deref. Enabling the tracepoint requires\nroot, but the trigger itself is unprivileged: socket(AF_SMC, ...) has\nno capability check, and SMC-D negotiation needs no admin step on\ns390 or on x86 with the loopback ISM device loaded.\n\nLog an empty device name for SMC-D instead of dereferencing NULL."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/smc/smc_tracepoint.h"],"versions":[{"version":"aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84","lessThan":"68200112534bb2acd1d7117dc2d5c124868d866d","status":"affected","versionType":"git"},{"version":"aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84","lessThan":"720c76b930c52cd58f50eb6b10569d03dccc7959","status":"affected","versionType":"git"},{"version":"aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84","lessThan":"b706d6d76a2a2793fe5ad0fbc2a75b6a460094ef","status":"affected","versionType":"git"},{"version":"aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84","lessThan":"d2ea0b8aef8746e147602eac87ca8538f4bc7e66","status":"affected","versionType":"git"},{"version":"aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84","lessThan":"561cf66fa9b6c86dfe4e687d2d1aeaaa6739917f","status":"affected","versionType":"git"},{"version":"aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84","lessThan":"7bf563badd37cb796df5477d2b78bb64148a1268","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/smc/smc_tracepoint.h"],"versions":[{"version":"5.16","status":"affected"},{"version":"0","lessThan":"5.16","status":"unaffected","versionType":"semver"},{"version":"6.1.175","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.142","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.92","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.34","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.11","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.6.142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.12.92"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/68200112534bb2acd1d7117dc2d5c124868d866d"},{"url":"https://git.kernel.org/stable/c/720c76b930c52cd58f50eb6b10569d03dccc7959"},{"url":"https://git.kernel.org/stable/c/b706d6d76a2a2793fe5ad0fbc2a75b6a460094ef"},{"url":"https://git.kernel.org/stable/c/d2ea0b8aef8746e147602eac87ca8538f4bc7e66"},{"url":"https://git.kernel.org/stable/c/561cf66fa9b6c86dfe4e687d2d1aeaaa6739917f"},{"url":"https://git.kernel.org/stable/c/7bf563badd37cb796df5477d2b78bb64148a1268"}],"title":"net/smc: avoid NULL deref of conn->lnk in smc_msg_event tracepoint","x_generator":{"engine":"bippy-1.2.0"}}}}