Security readout for executives and security teams
Plain-English summary
A Linux kernel memory-safety flaw can free a TCP Authentication Option key while it is still being examined. A locally authenticated, low-privilege user may trigger serious confidentiality, integrity, or availability impact. The supplied record rates it 7.8 High.
Executive priority
Treat as a high-priority kernel update for multi-user or locally exposed Linux systems. Schedule prompt remediation through supported vendor channels, while recognizing that no active exploitation evidence is supplied.
Technical view
CVE-2024-27394 is a CWE-416 use-after-free in tcp_ao_connect_init. An RCU grace period may complete during key-list traversal because call_rcu occurs outside the RCU read-side critical section. The resolution replaces the traversal with a safe iterator.
Likely exposure
Prioritize Linux systems matching the supplied affected-version data, especially where untrusted local users can reach the relevant TCP-AO path. The version metadata includes 6.7, 6.8.9, and 6.9, but is insufficiently clear to define a complete affected range.
Exploitation context
The CVSS vector describes local access, low complexity, low privileges, no user interaction, and potentially high impact across confidentiality, integrity, and availability. The supplied record is not in KEV and provides no evidence of active exploitation.
Researcher notes
The stated correction changes hlist_for_each_entry_rcu to hlist_for_each_entry_safe in tcp_ao_connect_init. The bundle supplies two stable-kernel commits but does not clearly map every vulnerable or fixed release. Validate downstream backports by commit or vendor advisory, not version number alone.
Mitigation direction
- Check distribution or kernel-vendor guidance for confirmed affected and fixed releases.
- Upgrade to a vendor-supported kernel containing the official correction.
- Restrict unnecessary local access until remediation is confirmed.
- Apply normal reboot requirements after kernel replacement, following vendor guidance.
Validation and detection
- Inventory running kernel versions across Linux systems.
- Compare each kernel against vendor advisories and the supplied upstream fix commits.
- Confirm the installed kernel contains the relevant correction.
- Verify systems booted into the remediated kernel after updating.
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.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2024-27394 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H1.45.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
7.4HighVector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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/ca4fb6c6764b3f75b4f5aa81db1536291897ff7fCVE reference, Linux
- https://git.kernel.org/stable/c/80e679b352c3ce5158f3f778cfb77eb767e586fbCVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.