CVE-2024-27397 (GCVE-0-2024-27397)

Vulnerability from cvelistv5 – Published: 2024-05-09 16:37 – Updated: 2026-10-15 00:40
VLAI
Title
netfilter: nf_tables: use timestamp to check for set element timeout
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: use timestamp to check for set element timeout Add a timestamp field at the beginning of the transaction, store it in the nftables per-netns area. Update set backend .insert, .deactivate and sync gc path to use the timestamp, this avoids that an element expires while control plane transaction is still unfinished. .lookup and .update, which are used from packet path, still use the current time to check if the element has expired. And .get path and dump also since this runs lockless under rcu read size lock. Then, there is async gc which also needs to check the current time since it runs asynchronously from a workqueue.
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: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-17 17:39 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c3e1b005ed1cc068fc9d454a6e745830d55d251d , < f8dfda798650241c1692058713ca4fef8e429061 (git)
Affected: c3e1b005ed1cc068fc9d454a6e745830d55d251d , < eaf1a29ea5d7dba8e84e9e9f3b3f47d0cd540bfe (git)
Affected: c3e1b005ed1cc068fc9d454a6e745830d55d251d , < 7b17de2a71e56c10335b565cc7ad238e6d984379 (git)
Affected: c3e1b005ed1cc068fc9d454a6e745830d55d251d , < 0d40e8cb1d1f56a994cdd2e015af622fdca9ed4d (git)
Affected: c3e1b005ed1cc068fc9d454a6e745830d55d251d , < b45176b869673417ace338b87cf9cdb66e2eeb01 (git)
Affected: c3e1b005ed1cc068fc9d454a6e745830d55d251d , < 7fa2e2960fff8322ce2ded57b5f8e9cbc450b967 (git)
Affected: c3e1b005ed1cc068fc9d454a6e745830d55d251d , < 383182db8d58c4237772ba0764cded4938a235c3 (git)
Affected: c3e1b005ed1cc068fc9d454a6e745830d55d251d , < 7395dfacfff65e9938ac0889dafa1ab01e987d15 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.1
Unaffected: 0 , < 4.1 (semver)
Unaffected: 4.19.320 , ≤ 4.19.* (semver)
Unaffected: 5.4.282 , ≤ 5.4.* (semver)
Unaffected: 5.10.224 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.97 , ≤ 6.1.* (semver)
Unaffected: 6.6.84 , ≤ 6.6.* (semver)
Unaffected: 6.7.5 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < V1.1.1 (custom)
guessed Create a notification for this product.
Show details on NVD website
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                  "value": "AV:L - The vulnerable code is reached only through the NETLINK_NETFILTER socket (`nfnetlink_rcv_batch` \u2192 `nf_tables_newsetelem`/`delsetelem` \u2192 set backend `.insert`/`.deactivate`/sync GC), which requires a local process on the system. Per kernel scoring guidance, netfilter/nftables netlink control-plane bugs are Local.\nAC:L - The attacker controls both sides of the timing window: `NFTA_SET_ELEM_TIMEOUT`/`NFTA_SET_ELEM_EXPIRATION` set the expiry instant at millisecond granularity, and the length of the netlink batch determines how long the transaction runs under `commit_mutex`, so the element can be made to flip to expired at a chosen point mid-transaction with no reliance on uncontrolled conditions.\nPR:L - `nfnetlink` only requires `netlink_net_capable(skb, CAP_NET_ADMIN)`, which is `ns_capable` against the user namespace owning the netns, so an unprivileged user obtains it with `unshare -Urn`. No real root in the init namespace is needed.\nUI:N - The attacker performs every step from their own process \u2014 create the set, add the timed element, submit the batch \u2014 with no victim action of any kind.\nS:U - The corruption is of kernel heap objects and results in privilege escalation within the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The double-free/use-after-free on `nft_rhash_elem`/`nft_rbtree_elem`/`nft_pipapo_elem` lets the attacker reclaim the freed slab chunk with a chosen object and read it back via `NFT_MSG_GETSETELEM` dumps and element counter/quota expressions, yielding an arbitrary kernel-memory read primitive; the `use`-counter underflow additionally exposes freed `nft_chain`/`nft_object` contents.\nI:H - The abort path writes into the freed element (`nft_setelem_data_activate()` + `ops-\u003eactivate()` incrementing refcounts through a dangling pointer) and the duplicate-key/double-free conditions give a controllable heap write primitive suitable for control-flow hijacking and root privilege escalation; the dangling-interval side effect also silently alters firewall verdicts.\nA:H - Even without successful exploitation, the double free and the `nft_use_dec` refcount underflow reliably trigger kernel oops/panic (slab corruption, `refcount_t` warnings, freeing a chain still referenced by the packet path), crashing the system."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:29:31.362Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/f8dfda798650241c1692058713ca4fef8e429061"
            },
            {
              "url": "https://git.kernel.org/stable/c/eaf1a29ea5d7dba8e84e9e9f3b3f47d0cd540bfe"
            },
            {
              "url": "https://git.kernel.org/stable/c/7b17de2a71e56c10335b565cc7ad238e6d984379"
            },
            {
              "url": "https://git.kernel.org/stable/c/0d40e8cb1d1f56a994cdd2e015af622fdca9ed4d"
            },
            {
              "url": "https://git.kernel.org/stable/c/b45176b869673417ace338b87cf9cdb66e2eeb01"
            },
            {
              "url": "https://git.kernel.org/stable/c/7fa2e2960fff8322ce2ded57b5f8e9cbc450b967"
            },
            {
              "url": "https://git.kernel.org/stable/c/383182db8d58c4237772ba0764cded4938a235c3"
            },
            {
              "url": "https://git.kernel.org/stable/c/7395dfacfff65e9938ac0889dafa1ab01e987d15"
            }
          ],
          "title": "netfilter: nf_tables: use timestamp to check for set element timeout",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-27397",
        "datePublished": "2024-05-09T16:37:22.463Z",
        "dateReserved": "2024-02-25T13:47:42.677Z",
        "dateUpdated": "2026-10-15T00:40:17.017Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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