Security readout for executives and security teams
Plain-English summary
A Linux kernel locking flaw can create a circular dependency when three specific firewall-management operations occur concurrently. This may stall affected networking or firewall administration activity, creating an availability concern. The supplied sources do not quantify impact, assign a severity score, or establish remote reachability.
Executive priority
Prioritize verification on firewalls, gateways, container hosts, and other systems with frequent automated netfilter changes. Urgency is operational rather than evidence of active attacks: patch through normal expedited kernel maintenance where exposure exists, while avoiding an unsupported critical rating given the missing severity and exploitation evidence.
Technical view
The nf_tables reset path used commit_mutex in a way that could deadlock with nfnl_subsys_ipset and nlk_cb_mutex. The conflict requires concurrent nft reset, ipset list, and iptables-nft rule processing using set matching. Referenced stable-kernel commits remove the unnecessary commit_mutex usage because individual reset handlers can safely run concurrently.
Likely exposure
Exposure is limited to Linux systems containing the affected kernel code and exercising the identified netfilter operations concurrently. The source lists versions 6.7, 6.12.101, 6.18.42, 6.19.4, and 7.0 as affected, but also contains an ambiguous affected entry of "0". Distribution backports require vendor-specific verification.
Exploitation context
The CVE is not listed as KEV in the supplied bundle, and no cited source reports active exploitation or a public exploit. Triggering depends on a specific concurrency condition involving nftables, ipset, and iptables-nft set matching. The sources do not establish whether an unprivileged or remote actor can cause it.
Researcher notes
The record describes a lock-ordering defect rather than memory corruption or privilege escalation. Important unanswered questions include the precise vulnerable version ranges, user privileges required to reach each operation, observable failure mode, and distribution backport status. The duplicate hashes and ambiguous "0" version reduce confidence in interpreting the supplied affected-version data.
Mitigation direction
- Install a vendor-supported kernel containing the applicable referenced stable-kernel correction.
- Check distribution advisories because kernel version strings alone may not reveal backported fixes.
- Limit concurrent firewall-management automation involving nft reset, ipset listing, and iptables-nft set matching until remediated.
- Escalate affected firewall hosts where administrative stalls could disrupt critical network operations.
Validation and detection
- Inventory deployed kernels and identify systems using nftables, ipset, or iptables-nft compatibility tooling.
- Confirm whether each distribution kernel includes the applicable corrective commit or vendor backport.
- Review automation and operational logs for overlapping firewall reset, set-listing, and set-matching activity.
- Test remediation in a controlled environment for normal firewall updates and absence of locking warnings.
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
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ATT&CK lookup starting points
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CVE-2026-45901 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/d66bedfe97a2bc321fa8118e669aae988038f729CVE reference, Linux
- https://git.kernel.org/stable/c/f6410d18c1e2da325df02be989d5bca5ed38b086CVE reference, Linux
- https://git.kernel.org/stable/c/ee3978b6a0dcd4215cb7cedcba705a12174786a7CVE reference, Linux
- https://git.kernel.org/stable/c/7f261bb906bf527c4a6e2a646e2d5f3679f2a8bcCVE reference, Linux
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.