Security readout for executives and security teams
Plain-English summary
CVE-2024-41040 is a Linux kernel use-after-free bug in network traffic-control conntrack handling. It can cause the kernel to reuse freed memory after resolving a conntrack clash. The bundle does not provide CVSS, impact class, or active exploitation evidence, so urgency depends on whether affected kernel versions and this networking path are present.
Executive priority
Schedule remediation in the next regular kernel patch cycle, faster for exposed network infrastructure. There is no provided evidence of active exploitation, but kernel memory-safety bugs in packet paths can carry operational risk.
Technical view
The issue is in net/sched act_ct processing. After conntrack confirmation resolves a clash, the conntrack object may be dropped but still passed to tcf_ct_flow_table_process_conn, producing a KASAN slab-use-after-free. The described fix retrieves ct from skb again after conntrack confirmation.
Likely exposure
Likely exposure is Linux systems running affected kernel builds where traffic control, cls_flower, act_ct, and conntrack paths are used. Network appliances, container hosts, and routing/firewall systems deserve priority review. The supplied version data is incomplete enough that vendor kernel advisories should be treated as authoritative.
Exploitation context
The bundle reports a KASAN-discovered use-after-free and stable kernel fixes. It does not cite public exploitation, proof-of-concept activity, or CISA KEV listing. Do not treat this as known exploited based on the provided evidence.
Researcher notes
Focus analysis on the conntrack clash path through tcf_ct_act, nf_ct_resolve_clash, and tcf_ct_flow_table_process_conn. The evidence supports memory reuse after object drop, but not exploitability level, required privileges, or remote triggerability.
Mitigation direction
- Apply vendor kernel updates that include the referenced stable Linux fixes.
- Check Debian LTS guidance if running affected Debian kernel packages.
- Prioritize systems using tc flower, act_ct, conntrack, routing, or firewall workloads.
- If unable to patch, request supported workarounds from the kernel or distribution vendor.
Validation and detection
- Inventory running kernel versions and compare them with vendor advisories for CVE-2024-41040.
- Check whether tc flower, act_ct, and conntrack are used on exposed systems.
- Confirm patched kernels include one of the referenced stable commits or vendor backports.
- Review kernel logs for related KASAN, UAF, or networking crash reports where available.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2024-41040 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/b81a523d54ea689414f67c9fb81a5b917a41ed55CVE reference, Linux
- https://git.kernel.org/stable/c/2b4d68df3f57ea746c430941ba9c03d7d8b5a23fCVE reference, Linux
- https://git.kernel.org/stable/c/4e71b10a100861fb27d9c5755dfd68f615629faeCVE reference, Linux
- https://git.kernel.org/stable/c/799a34901b634008db4a7ece3900e2b971d4c932CVE reference, Linux
- https://git.kernel.org/stable/c/ef472cc6693b16b202a916482df72f35d94bd69eCVE reference, Linux
- https://git.kernel.org/stable/c/26488172b0292bed837b95a006a3f3431d1898c3CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.htmlCVE reference, CVE
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.