{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43376","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:56.006Z","datePublished":"2026-05-08T14:21:25.854Z","dateUpdated":"2026-05-11T22:23:23.503Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:23:23.503Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free by using call_rcu() for oplock_info\n\nksmbd currently frees oplock_info immediately using kfree(), even\nthough it is accessed under RCU read-side critical sections in places\nlike opinfo_get() and proc_show_files().\n\nSince there is no RCU grace period delay between nullifying the pointer\nand freeing the memory, a reader can still access oplock_info\nstructure after it has been freed. This can leads to a use-after-free\nespecially in opinfo_get() where atomic_inc_not_zero() is called on\nalready freed memory.\n\nFix this by switching to deferred freeing using call_rcu()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/oplock.c","fs/smb/server/oplock.h"],"versions":[{"version":"296cb5457cc6f4a754c4ae29855f8a253d52bcc6","lessThan":"302fef75512b2c8329a3f5efab1ae7ba2562387a","status":"affected","versionType":"git"},{"version":"d54ab1520d43e95f9b2e22d7a05fc9614192e5a5","lessThan":"08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c","status":"affected","versionType":"git"},{"version":"18b4fac5ef17f77fed9417d22210ceafd6525fc7","lessThan":"1d6abf145615dbfe267ce3b0a271f95e3780e18e","status":"affected","versionType":"git"},{"version":"18b4fac5ef17f77fed9417d22210ceafd6525fc7","lessThan":"ce8507ee82c888126d8e7565e27c016308d24cde","status":"affected","versionType":"git"},{"version":"18b4fac5ef17f77fed9417d22210ceafd6525fc7","lessThan":"1dfd062caa165ec9d7ee0823087930f3ab8a6294","status":"affected","versionType":"git"},{"version":"d73686367ad68534257cd88a36ca3c52cb8b81d8","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/oplock.c","fs/smb/server/oplock.h"],"versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.78","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.19","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.9","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"6.6.88","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.25","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14.4"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a"},{"url":"https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c"},{"url":"https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e"},{"url":"https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde"},{"url":"https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294"}],"title":"ksmbd: fix use-after-free by using call_rcu() for oplock_info","x_generator":{"engine":"bippy-1.2.0"}}}}