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

Vulnerability from cvelistv5 – Published: 2026-04-03 13:24 – Updated: 2026-08-05 12:21
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
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
Affected: 5.17.7 , < 5.18 (semver)
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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 , ≤ * (original_commit_for_fix)
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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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnet/rds: Correcci\u00f3n de la dependencia de bloqueo circular en rds_tcp_tune\\n\\nsyzbot inform\u00f3 de una dependencia de bloqueo circular en rds_tcp_tune() donde se llama a sk_net_refcnt_upgrade() mientras se mantiene el bloqueo del socket:\\n\\n======================================================\\nADVERTENCIA: posible dependencia de bloqueo circular detectada\\n======================================================\\nkworker/u10:8/15040 est\u00e1 intentando adquirir el bloqueo:\\nffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0},\\nen: __kmalloc_cache_noprof+0x4b/0x6f0\\n\\npero la tarea ya est\u00e1 manteniendo el bloqueo:\\nffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0},\\nen: rds_tcp_tune+0xd7/0x930\\n\\nEl problema ocurre porque sk_net_refcnt_upgrade() realiza una asignaci\u00f3n de memoria (a trav\u00e9s de get_net_track()  -\u003e  ref_tracker_alloc()) mientras se mantiene el bloqueo del socket, creando una dependencia circular con fs_reclaim.\\n\\nSolucione esto moviendo sk_net_refcnt_upgrade() fuera de la secci\u00f3n cr\u00edtica del bloqueo del socket. Esto es seguro porque los campos modificados por la llamada a sk_net_refcnt_upgrade() (sk_net_refcnt, ns_tracker) no son accedidos por ninguna ruta de c\u00f3digo concurrente en este punto.\\n\\nv2:\\n  - Etiqueta de correcciones corregida\\n  - revisar peque\u00f1os errores de ajuste de l\u00ednea del parche\\n  - peque\u00f1os errores en los comentarios de ai\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/rds/tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3a58f13a881ed351198ffab4cf9953cf19d2ab3a\",\"lessThan\":\"8babb271403378ba6836f6c8599c5313d0e2355d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3a58f13a881ed351198ffab4cf9953cf19d2ab3a\",\"lessThan\":\"8519e6883a942e510f33a0e634e27bcc3a844a40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3a58f13a881ed351198ffab4cf9953cf19d2ab3a\",\"lessThan\":\"6ce948fa54599f369ff7fe8b793a6aae4b0762b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3a58f13a881ed351198ffab4cf9953cf19d2ab3a\",\"lessThan\":\"026bbaeeab9e04534ee58882b6447300629b42f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3a58f13a881ed351198ffab4cf9953cf19d2ab3a\",\"lessThan\":\"6a877ececd6daa002a9a0002cd0fbca6592a9244\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a6efabed754c9dcf27e6def71317b374f58a852\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.17.7\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/rds/tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.130\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.77\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.17\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.7\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17.7\",\"versionEndExcluding\":\"5.18\",\"matchCriteriaId\":\"13A05898-2C81-4FD8-A692-D2E1418B0640\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.18.1\",\"versionEndExcluding\":\"6.6.130\",\"matchCriteriaId\":\"32BB513D-AB55-4C3B-8466-6992E214206D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.77\",\"matchCriteriaId\":\"B3D12E00-E42D-4056-B354-BAD4903C03A5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.17\",\"matchCriteriaId\":\"A5E006E4-59C7-43C1-9231-62A72219F2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.7\",\"matchCriteriaId\":\"69245D10-0B71-485E-80C3-A64F077004D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"0384FA0A-DE99-48D7-84E3-46ED0C3B5E03\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T11:45:48+00:00",
      "cve": "CVE-2026-23419",
      "id": "CVE-2026-23419",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/rds: Fix circular locking dependency in rds_tcp_tune",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23419.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:36:16Z",
      "cve": "CVE-2026-23419",
      "id": "CVE-2026-23419",
      "initial_release_date": "2026-04-03T23:28:16Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "444",
      "product_status:known_not_affected": "284",
      "product_status:recommended": "280",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23419",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23419.json",
      "version": "34"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.