CVE-2025-38083 (GCVE-0-2025-38083)

Vulnerability from cvelistv5 – Published: 2025-06-20 11:21 – Updated: 2026-10-15 21:52
VLAI
Title
net_sched: prio: fix a race in prio_tune()
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:47 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 53d11560e957d53ee87a0653d258038ce12361b7 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 4483d8b9127591c60c4eb789d6cab953bc4522a9 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 46c15c9d0f65c9ba857d63f53264f4b17e8a715f (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < e3f6745006dc9423d2b065b90f191cfa11b1b584 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 93f9eeb678d4c9c1abf720b3615fa8299a490845 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < d35acc1be3480505b5931f17e4ea9b7617fea4d3 (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.295 , ≤ 5.4.* (semver)
Unaffected: 5.10.239 , ≤ 5.10.* (semver)
Unaffected: 5.15.186 , ≤ 5.15.* (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.94 , ≤ 6.6.* (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.34",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.15.3",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.16",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: prio: fix a race in prio_tune()\n\nGerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer\nfires at the wrong time.\n\nThe race is as follows:\n\nCPU 0                                 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n |\n |                                    [5]: lock root\n |                                    [6]: rehash\n |                                    [7]: qdisc_tree_reduce_backlog()\n |\n[4]: qdisc_put()\n\nThis can be abused to underflow a parent\u0027s qlen.\n\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable code is reached only via `RTM_NEWQDISC` netlink messages (`tc qdisc change ... prio bands N`) combined with locally enqueued traffic; no data from a remote peer reaches `prio_tune()`.\nAC:L - The attacker controls both sides of the race \u2014 they set the SFQ child\u0027s `perturb` period and drop-forcing `flows`/`depth` parameters, choose when to issue the band-shrinking change, and can retry unboundedly until the timer lands in the unlocked window between `sch_tree_unlock()` and `qdisc_put()`.\nPR:L - The tc/qdisc netlink path is gated only by `netlink_net_capable(skb, CAP_NET_ADMIN)` against the netns\u0027 own user namespace, so an unprivileged user obtains it with `unshare -Urn` and can also autoload `sch_prio`/`sch_sfq` from that context.\nUI:N - The attacker performs every step themselves \u2014 building the prio/SFQ hierarchy, generating the traffic, and triggering the reconfiguration. No victim action is involved.\nS:U - The corrupted `qlen`/`backlog` accounting and any resulting memory corruption stay within the kernel\u0027s own security authority; this is standard local kernel privilege escalation with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The double subtraction underflows the unsigned `q.qlen`, desynchronizing the qdisc tree so classes stay on parent active lists after their child qdiscs are freed, yielding a use-after-free on `struct Qdisc`/class objects that can be groomed into an arbitrary kernel-memory read.\nI:H - The same qlen-desync-to-UAF primitive gives control over reallocated heap objects and their function pointers and list heads, enabling arbitrary write and control-flow hijacking \u2014 the well-known net/sched local privilege escalation pattern.\nA:H - Even unweaponized, the underflowed `qlen` makes an empty qdisc appear to hold ~4 billion packets, causing dequeue-from-empty warnings, stalled transmit paths, and use-after-free oopses that panic the kernel."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:59:21.321Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/53d11560e957d53ee87a0653d258038ce12361b7"
            },
            {
              "url": "https://git.kernel.org/stable/c/4483d8b9127591c60c4eb789d6cab953bc4522a9"
            },
            {
              "url": "https://git.kernel.org/stable/c/20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f"
            },
            {
              "url": "https://git.kernel.org/stable/c/3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4"
            },
            {
              "url": "https://git.kernel.org/stable/c/46c15c9d0f65c9ba857d63f53264f4b17e8a715f"
            },
            {
              "url": "https://git.kernel.org/stable/c/e3f6745006dc9423d2b065b90f191cfa11b1b584"
            },
            {
              "url": "https://git.kernel.org/stable/c/93f9eeb678d4c9c1abf720b3615fa8299a490845"
            },
            {
              "url": "https://git.kernel.org/stable/c/d35acc1be3480505b5931f17e4ea9b7617fea4d3"
            }
          ],
          "title": "net_sched: prio: fix a race in prio_tune()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-38083",
        "datePublished": "2025-06-20T11:21:51.554Z",
        "dateReserved": "2025-04-16T04:51:23.981Z",
        "dateUpdated": "2026-10-15T21:52:07.502Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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