{"api_version":"1","generated_at":"2026-06-26T03:58:55+00:00","cve":"CVE-2026-53274","urls":{"html":"https://cve.report/CVE-2026-53274","api":"https://cve.report/api/cve/CVE-2026-53274.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53274","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53274"},"summary":{"title":"net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS\n\nA logic flaw in __smc_setsockopt() allows a local unprivileged user to\ncause a Denial of Service (DoS) by holding the socket lock indefinitely.\n\nThe function __smc_setsockopt() calls copy_from_sockptr() while holding\nlock_sock(sk). By passing a userfaultfd-monitored memory page (or\nFUSE-backed memory on systems where unprivileged userfaultfd is disabled)\nas the optval, an attacker can halt execution during the copy operation,\nkeeping the lock held.\n\nCombined with asynchronous tear-down operations like shutdown(), this\nexhausts the kernel wq (kworkers) and triggers the hung task watchdog.\n\n[  240.123456] INFO: task kworker/u8:2 blocked for more than 120 seconds.\n[  240.123489] Call Trace:\n[  240.123501]  smc_shutdown+...\n[  240.123512]  lock_sock_nested+...\n\nThis patch moves the user-space copy outside the lock_sock() critical\nsection to prevent the issue.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:45","updated_at":"2026-06-25 09:16:45"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91","name":"https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a","name":"https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff","name":"https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420","name":"https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511","name":"https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0","name":"https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53274","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53274","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 35a22117839602bb52283de08894c5a7dde92420 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 5d27d2ffe487df89ce28fda0410eafa05dbe03a0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 89f6fbe0033c942cb790ffd53ca93a45eeaf1c91 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 dcd90f42a33e4220385f27b515183d0c91b2fc4a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 94d286fa5eedc550d42bcb9c85416af8f77736ff git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a6a6fe27bab48f0d09a64b051e7bde432fcae081 a3fdd924d88c30b9f488636ce0e4696012cf5511 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53274","cve":"CVE-2026-53274","epss":"0.001810000","percentile":"0.078200000","score_date":"2026-06-25","updated_at":"2026-06-26 00:06:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/smc/af_smc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"35a22117839602bb52283de08894c5a7dde92420","status":"affected","version":"a6a6fe27bab48f0d09a64b051e7bde432fcae081","versionType":"git"},{"lessThan":"5d27d2ffe487df89ce28fda0410eafa05dbe03a0","status":"affected","version":"a6a6fe27bab48f0d09a64b051e7bde432fcae081","versionType":"git"},{"lessThan":"89f6fbe0033c942cb790ffd53ca93a45eeaf1c91","status":"affected","version":"a6a6fe27bab48f0d09a64b051e7bde432fcae081","versionType":"git"},{"lessThan":"dcd90f42a33e4220385f27b515183d0c91b2fc4a","status":"affected","version":"a6a6fe27bab48f0d09a64b051e7bde432fcae081","versionType":"git"},{"lessThan":"94d286fa5eedc550d42bcb9c85416af8f77736ff","status":"affected","version":"a6a6fe27bab48f0d09a64b051e7bde432fcae081","versionType":"git"},{"lessThan":"a3fdd924d88c30b9f488636ce0e4696012cf5511","status":"affected","version":"a6a6fe27bab48f0d09a64b051e7bde432fcae081","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/smc/af_smc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.18"},{"lessThan":"5.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS\n\nA logic flaw in __smc_setsockopt() allows a local unprivileged user to\ncause a Denial of Service (DoS) by holding the socket lock indefinitely.\n\nThe function __smc_setsockopt() calls copy_from_sockptr() while holding\nlock_sock(sk). By passing a userfaultfd-monitored memory page (or\nFUSE-backed memory on systems where unprivileged userfaultfd is disabled)\nas the optval, an attacker can halt execution during the copy operation,\nkeeping the lock held.\n\nCombined with asynchronous tear-down operations like shutdown(), this\nexhausts the kernel wq (kworkers) and triggers the hung task watchdog.\n\n[  240.123456] INFO: task kworker/u8:2 blocked for more than 120 seconds.\n[  240.123489] Call Trace:\n[  240.123501]  smc_shutdown+...\n[  240.123512]  lock_sock_nested+...\n\nThis patch moves the user-space copy outside the lock_sock() critical\nsection to prevent the issue."}],"providerMetadata":{"dateUpdated":"2026-06-25T08:39:58.478Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/35a22117839602bb52283de08894c5a7dde92420"},{"url":"https://git.kernel.org/stable/c/5d27d2ffe487df89ce28fda0410eafa05dbe03a0"},{"url":"https://git.kernel.org/stable/c/89f6fbe0033c942cb790ffd53ca93a45eeaf1c91"},{"url":"https://git.kernel.org/stable/c/dcd90f42a33e4220385f27b515183d0c91b2fc4a"},{"url":"https://git.kernel.org/stable/c/94d286fa5eedc550d42bcb9c85416af8f77736ff"},{"url":"https://git.kernel.org/stable/c/a3fdd924d88c30b9f488636ce0e4696012cf5511"}],"title":"net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53274","datePublished":"2026-06-25T08:39:58.478Z","dateReserved":"2026-06-09T07:44:35.395Z","dateUpdated":"2026-06-25T08:39:58.478Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:45","lastModifiedDate":"2026-06-25 09:16:45","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53274","Ordinal":"1","Title":"net/smc: fix sleep-inside-lock in __smc_setsockopt() causing loc","CVE":"CVE-2026-53274","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53274","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS\n\nA logic flaw in __smc_setsockopt() allows a local unprivileged user to\ncause a Denial of Service (DoS) by holding the socket lock indefinitely.\n\nThe function __smc_setsockopt() calls copy_from_sockptr() while holding\nlock_sock(sk). By passing a userfaultfd-monitored memory page (or\nFUSE-backed memory on systems where unprivileged userfaultfd is disabled)\nas the optval, an attacker can halt execution during the copy operation,\nkeeping the lock held.\n\nCombined with asynchronous tear-down operations like shutdown(), this\nexhausts the kernel wq (kworkers) and triggers the hung task watchdog.\n\n[  240.123456] INFO: task kworker/u8:2 blocked for more than 120 seconds.\n[  240.123489] Call Trace:\n[  240.123501]  smc_shutdown+...\n[  240.123512]  lock_sock_nested+...\n\nThis patch moves the user-space copy outside the lock_sock() critical\nsection to prevent the issue.","Type":"Description","Title":"net/smc: fix sleep-inside-lock in __smc_setsockopt() causing loc"}]}}}