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net/rds: use wq_has_sleeper() in rds_cong_map_updated()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/rds: use wq_has_sleeper() in rds_cong_map_updated() rds_cong_map_updated() runs after a peer's congestion map has been rewritten (by rds_tcp_cong_recv() and rds_ib_cong_recv(), or the clear-all in the loopback and IB send-completion paths). It bumps rds_cong_generation and then checks waitqueue_active() on map->m_waitq and on rds_poll_waitq to decide whether anyone needs waking. atomic_inc() carries no ordering and waitqueue_active() is a plain load, so nothing orders the map and generation stores before the wait queue reads. The waiters do the mirror image: rds_cong_wait() adds itself to m_waitq and then tests the port bit, and rds_poll() registers on rds_poll_waitq and then reads the generation. That is the store-buffering pattern described above waitqueue_active() in include/linux/wait.h - the updater can observe an empty wait queue while the waiter still observes the port as congested, and no wake-up is issued. rds_cong_wait() is an interruptible sleep with no timeout, so a sender blocked on a congested port stays blocked until the next congestion update from that peer arrives or a signal is delivered. A poll() waiter misses the map-updated notification the same way. Use wq_has_sleeper(), which is waitqueue_active() preceded by the required full barrier, as rds_tcp_state_change() already does for the same pattern.

Announced Source revision 1
Original source ↗

CVE-2026-90081

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90081

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "922cb17a5c812fcc9ebee249f4109db099896941",
        "lessThan": "2a809d7896dbf18e1ecfbdd930f71c9fc298b16d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "922cb17a5c812fcc9ebee249f4109db099896941",
        "lessThan": "fa4b98e891fda28cc0638d809c6125ec63d8319d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "922cb17a5c812fcc9ebee249f4109db099896941",
        "lessThan": "0e169f6a2adeb17b5577ed7e8abd642465bb50ec",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "922cb17a5c812fcc9ebee249f4109db099896941",
        "lessThan": "42884bd8b8fd023d6a610a695bd5ddd1d5dece17",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "922cb17a5c812fcc9ebee249f4109db099896941",
        "lessThan": "a526214b9f0548ca0e53a6e0d1727d8ea9befc23",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "922cb17a5c812fcc9ebee249f4109db099896941",
        "lessThan": "bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "922cb17a5c812fcc9ebee249f4109db099896941",
        "lessThan": "281f9fda2e06d6c211bb365a5379ed2e05cc2e21",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "922cb17a5c812fcc9ebee249f4109db099896941",
        "lessThan": "d4f484661961636eb90d287050959e613795f73a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/rds/cong.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.30"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.30",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/rds/cong.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90081

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36497 · Revision 1
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