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CVE Record

CVE-2024-26824: crypto: algif_hash - Remove bogus SGL free on zero-length error path

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_hash - Remove bogus SGL free on zero-length error path When a zero-length message is hashed by algif_hash, and an error is triggered, it tries to free an SG list that was never allocated in the first place. Fix this by not freeing the SG list on the zero-length error path.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux kernel hashing path can try to free memory metadata that was never allocated when handling a zero-length message after an error. Because this occurs in kernel space, consequences could be serious, reflected by CVSS 7.8. The supplied evidence does not establish a specific real-world outcome or exploitation.

Executive priority

Treat this as high priority on multi-user, shared-compute, development, and other systems allowing untrusted local code. Prioritize supported kernel updates, but avoid declaring fleet-wide exposure until package-specific backport checks are complete.

Technical view

In algif_hash, zero-length hashing followed by an error enters cleanup for an SG list that was never allocated. The correction removes that free from the zero-length error path. The CVSS vector describes a local, low-complexity, low-privilege attack requiring no user interaction, with high confidentiality, integrity, and availability impacts.

Likely exposure

Potentially exposed assets are Linux systems running affected kernel builds where a low-privilege local process can reach algif_hash. The supplied version data is ambiguous and includes repeated identifiers, so confirm exposure through distributor advisories and backport records rather than version strings alone.

Exploitation context

The bundle marks KEV false and supplies no evidence of active exploitation or public exploit availability. The CVSS vector indicates a local attack, making this primarily relevant where an attacker already has low-privilege execution.

Researcher notes

This is an invalid cleanup operation in AF_ALG hash handling. The supplied material identifies no CWE, proof of exploitation, configuration prerequisites, or demonstrated impact beyond the CVSS assessment. Three stable-kernel fix commits are referenced, but the bundle does not map them to distribution packages.

Mitigation direction

  • Inventory running Linux kernels, prioritizing systems that permit untrusted local access.
  • Apply vendor-supported kernel updates incorporating the applicable stable-kernel fix.
  • Consult distributor advisories for package-specific fixed versions and backport information.
  • If updates are delayed, reduce untrusted local access and monitor vendor guidance.

Validation and detection

  • Compare each running kernel package with its distributor's CVE advisory and backport status.
  • Confirm the applicable fix is present in deployed kernel sources or package changelogs.
  • Reboot updated systems and verify the intended kernel version is running.
  • Use controlled regression testing to confirm zero-length ALG_IF error handling completes safely.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2024-26824 mapping review

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Vulnerability profileCVE Program record
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

Official CVE source material

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.

1CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-26824Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxb6d972f6898308fbe7e693bf8d44ebfdb1cd2dc4, b6d972f6898308fbe7e693bf8d44ebfdb1cd2dc4, b6d972f6898308fbe7e693bf8d44ebfdb1cd2dc4unaffected
LinuxLinux6.5, 0, 6.6.18, 6.7.6, 6.8affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.