{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23419","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:46.014Z","datePublished":"2026-04-03T13:24:23.958Z","dateUpdated":"2026-05-11T22:06:32.572Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:06:32.572Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: Fix circular locking dependency in rds_tcp_tune\n\nsyzbot reported a circular locking dependency in rds_tcp_tune() where\nsk_net_refcnt_upgrade() is called while holding the socket lock:\n\n======================================================\nWARNING: possible circular locking dependency detected\n======================================================\nkworker/u10:8/15040 is trying to acquire lock:\nffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0},\nat: __kmalloc_cache_noprof+0x4b/0x6f0\n\nbut task is already holding lock:\nffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0},\nat: rds_tcp_tune+0xd7/0x930\n\nThe issue occurs because sk_net_refcnt_upgrade() performs memory\nallocation (via get_net_track() -> ref_tracker_alloc()) while the\nsocket lock is held, creating a circular dependency with fs_reclaim.\n\nFix this by moving sk_net_refcnt_upgrade() outside the socket lock\ncritical section. This is safe because the fields modified by the\nsk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not\naccessed by any concurrent code path at this point.\n\nv2:\n  - Corrected fixes tag\n  - check patch line wrap nits\n  - ai commentary nits"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/tcp.c"],"versions":[{"version":"3a58f13a881ed351198ffab4cf9953cf19d2ab3a","lessThan":"8babb271403378ba6836f6c8599c5313d0e2355d","status":"affected","versionType":"git"},{"version":"3a58f13a881ed351198ffab4cf9953cf19d2ab3a","lessThan":"8519e6883a942e510f33a0e634e27bcc3a844a40","status":"affected","versionType":"git"},{"version":"3a58f13a881ed351198ffab4cf9953cf19d2ab3a","lessThan":"6ce948fa54599f369ff7fe8b793a6aae4b0762b2","status":"affected","versionType":"git"},{"version":"3a58f13a881ed351198ffab4cf9953cf19d2ab3a","lessThan":"026bbaeeab9e04534ee58882b6447300629b42f6","status":"affected","versionType":"git"},{"version":"3a58f13a881ed351198ffab4cf9953cf19d2ab3a","lessThan":"6a877ececd6daa002a9a0002cd0fbca6592a9244","status":"affected","versionType":"git"},{"version":"2a6efabed754c9dcf27e6def71317b374f58a852","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/rds/tcp.c"],"versions":[{"version":"5.18","status":"affected"},{"version":"0","lessThan":"5.18","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.77","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.17","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.7","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":"5.18","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.12.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17.7"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/8babb271403378ba6836f6c8599c5313d0e2355d"},{"url":"https://git.kernel.org/stable/c/8519e6883a942e510f33a0e634e27bcc3a844a40"},{"url":"https://git.kernel.org/stable/c/6ce948fa54599f369ff7fe8b793a6aae4b0762b2"},{"url":"https://git.kernel.org/stable/c/026bbaeeab9e04534ee58882b6447300629b42f6"},{"url":"https://git.kernel.org/stable/c/6a877ececd6daa002a9a0002cd0fbca6592a9244"}],"title":"net/rds: Fix circular locking dependency in rds_tcp_tune","x_generator":{"engine":"bippy-1.2.0"}}}}