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net/sched: cls_route: free emptied bucket on filter move

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_route: free emptied bucket on filter move route4_change can move an existing filter to a different top-level bucket: route4_set_parms recomputes the handle from TCA_ROUTE4_TO/ FROM/IIF, and the handle-mismatch check is gated on the 'new' flag, so for an existing filter the new handle may differ from the old one and land in a different bucket. When this happens, the filter is unlinked from the old bucket, but the bucket itself is never freed once it goes empty. The stale empty bucket remains in head->table[], causing route4_delete to report *last=false even after the last live filter is gone. That pins the empty tcf_proto and causes a leak. Fix this by refcounting the filters linked to a bucket and freeing the bucket when the count drops to zero. The existing scan in route4_delete goes away with it. The count is updated at all sites that link or unlink a filter during add, change and delete, and the bucket is dropped from head->table[] as soon as it reaches zero. Conditions to recreate the bug: CONFIG_NET_CLS_ROUTE4=y, CONFIG_NET_SCH_INGRESS=y, CONFIG_NET_CLS_ACT=y. tc qdisc replace dev lo clsact tc filter add dev lo ingress protocol ip pref 100 route from 1 to 1 tc filter change dev lo ingress protocol ip pref 100 handle 0x10001 \ route from 1 to 2 tc filter del dev lo ingress protocol ip pref 100 handle 0x10002 \ route from 1 to 2 tc filter show dev lo ingress | grep -c 'pref 100 route chain 0

Announced Source revision 1
Original source ↗

CVE-2026-97959

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-2026-97959

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": "1e052be69d045c8d0f82ff1116fd3e5a79661745",
        "lessThan": "9e7741b41a25b9d49df4d262fa314342e6f95c50",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745",
        "lessThan": "48d38bf8c22a05fde07ba1f885cde27b851649a2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745",
        "lessThan": "cc99d26b12431e4e4d0e346ec32764eb42c0aed9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745",
        "lessThan": "41e94079200aaf0cdbe4594b0af75710b33da124",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745",
        "lessThan": "2e2f130951d34871b0643bf700164d97cff4b427",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745",
        "lessThan": "f8495d67434e1cb7e511297687ca55fdb28e4c20",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745",
        "lessThan": "81dd117c04422c6d0c7974aba9fa6a0ba370959b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745",
        "lessThan": "1853f30cf5c84971f99788a76207c6f745380896",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/cls_route.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sched/cls_route.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97959

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38099 · Revision 1
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Publisher date
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