CVE-2026-23419 (GCVE-0-2026-23419)

Vulnerability from cvelistv5 – Published: 2026-04-03 13:24 – Updated: 2026-04-03 13:24
VLAI?
Title
net/rds: Fix circular locking dependency in rds_tcp_tune
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rds: Fix circular locking dependency in rds_tcp_tune syzbot reported a circular locking dependency in rds_tcp_tune() where sk_net_refcnt_upgrade() is called while holding the socket lock: ====================================================== WARNING: possible circular locking dependency detected ====================================================== kworker/u10:8/15040 is trying to acquire lock: ffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_cache_noprof+0x4b/0x6f0 but task is already holding lock: ffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: rds_tcp_tune+0xd7/0x930 The issue occurs because sk_net_refcnt_upgrade() performs memory allocation (via get_net_track() -> ref_tracker_alloc()) while the socket lock is held, creating a circular dependency with fs_reclaim. Fix this by moving sk_net_refcnt_upgrade() outside the socket lock critical section. This is safe because the fields modified by the sk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not accessed by any concurrent code path at this point. v2: - Corrected fixes tag - check patch line wrap nits - ai commentary nits
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 8babb271403378ba6836f6c8599c5313d0e2355d (git)
Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 8519e6883a942e510f33a0e634e27bcc3a844a40 (git)
Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 6ce948fa54599f369ff7fe8b793a6aae4b0762b2 (git)
Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 026bbaeeab9e04534ee58882b6447300629b42f6 (git)
Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 6a877ececd6daa002a9a0002cd0fbca6592a9244 (git)
Affected: 2a6efabed754c9dcf27e6def71317b374f58a852 (git)
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    Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc3 , ≤ * (original_commit_for_fix)
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          "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() -\u003e 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"
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      "providerMetadata": {
        "dateUpdated": "2026-04-03T13:24:23.958Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6a877ececd6daa002a9a0002cd0fbca6592a9244"
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    "dateReserved": "2026-01-13T15:37:46.014Z",
    "dateUpdated": "2026-04-03T13:24:23.958Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23419\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-03T14:16:27.843\",\"lastModified\":\"2026-04-03T16:10:23.730\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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() -\u003e 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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/026bbaeeab9e04534ee58882b6447300629b42f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6a877ececd6daa002a9a0002cd0fbca6592a9244\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ce948fa54599f369ff7fe8b793a6aae4b0762b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8519e6883a942e510f33a0e634e27bcc3a844a40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8babb271403378ba6836f6c8599c5313d0e2355d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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