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net: openvswitch: fix use-after-free of the flow table mask array

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix use-after-free of the flow table mask array tbl_mask_array_realloc() retires the old mask_array before it stops being reachable: old = ovsl_dereference(tbl->mask_array); if (old) { ... call_rcu(&old->rcu, mask_array_rcu_cb); } rcu_assign_pointer(tbl->mask_array, new); call_rcu() only waits for read-side critical sections already in flight. tbl->mask_array still points at old between the call_rcu() and the rcu_assign_pointer(), so a reader entering ovs_flow_tbl_lookup_stats() in that window picks up old in a fresh critical section that the pending grace period does not cover. tbl_mask_array_realloc() runs in process context under ovs_mutex, so the window is preemptible and can outlast the grace period. Then mask_array_rcu_cb() frees old before the swap runs: BUG: KASAN: slab-use-after-free in flow_lookup.constprop.0+0x2bf/0x2f0 Read of size 8 at addr ffff888020b3e018 by task poc/741 flow_lookup.constprop.0+0x2bf/0x2f0 ovs_flow_tbl_lookup_stats+0x4a3/0x5c0 ovs_dp_process_packet+0x19c/0x710 ovs_vport_receive+0x243/0x390 internal_dev_xmit+0x81/0x170 Freed by task 728: kfree+0x16a/0x4e0 rcu_core+0x853/0x1030 Publish the new array before retiring the old one. The kfree_rcu() that call_rcu() replaced ran after the swap.

Announced Source revision 1
Original source ↗

CVE-2026-97611

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-2026-97611

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": "eac87c413bf9794c14d488998a5265ea5b32f04e",
        "lessThan": "4c98b492e9ed63f9ca3e23566d9a6a4f235944f4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eac87c413bf9794c14d488998a5265ea5b32f04e",
        "lessThan": "4016ead17acd75312c066ecd47c4b7f0a81ceaa2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eac87c413bf9794c14d488998a5265ea5b32f04e",
        "lessThan": "017dbbf0d6c319a487f68e22f56d91fc787d5525",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eac87c413bf9794c14d488998a5265ea5b32f04e",
        "lessThan": "76678217cdabc41e3c74c23b45b62086ffb8fe7a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eac87c413bf9794c14d488998a5265ea5b32f04e",
        "lessThan": "cd982e11684def5d4a9fcfd5354de09032828414",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eac87c413bf9794c14d488998a5265ea5b32f04e",
        "lessThan": "a0d18d21d48a551f82ee344e50efb8a682161489",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eac87c413bf9794c14d488998a5265ea5b32f04e",
        "lessThan": "035e9c3722067648a99010711d0ce81f42572ef4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eac87c413bf9794c14d488998a5265ea5b32f04e",
        "lessThan": "ba4ba11ed6eb8972c69070417fc27b48deb002e8",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/openvswitch/flow_table.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.9",
        "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/openvswitch/flow_table.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97611

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38048 · Revision 1
Added to Heist Feed
Publisher date
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