VulnerabilityPublished 9 Nov 2024Updated 4 Nov 2025

CVE-2024-50250: Linux kernel · fsdax: dax_unshare_iter needs to copy entire blocks

Source GCVE Database

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Not known to be exploited · CVSS 7.1 High.

Data as of 29 Oct 2026, 23:00 UTC

CVSS 3.1 base score

7.1High

How severe the flaw is on the 0–10 CVSS scale.

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

Attack Vector: Local
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Nov 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-prf6-fvr5-qhc9

What to do

AI-suggested

A fix has been implemented in the Linux kernel to address this issue by aligning copy operations to page boundaries and adding calls to invalidate inode page ranges after unshare operations. Users and administrators should apply the official kernel updates that include this fix. Since this is not a cloud service, manual patching is required. Patch status is confirmed by the vendor advisory indicating resolution. No additional mitigations are specified beyond applying the patch.

Description

CVE-2024-50250 is a high-severity vulnerability in the Linux kernel's fsdax subsystem involving the dax_unshare_iter function. The flaw causes improper copying of data blocks when file positions and lengths are not aligned to fsblock boundaries, leading to data corruption and exposure of stale persistent memory contents. The issue arises because dax_iomap_direct_access returns pointers to the start of pages regardless of the requested position, causing misaligned copying and partial block updates. Additionally, the lack of invalidation of inode pages after unsharing can cause processes to access outdated memory mappings. The vulnerability has been resolved by ensuring copy operations are aligned to page boundaries and addressing the missing invalidation step.

Impact

This vulnerability can lead to data corruption and exposure of stale persistent memory contents, which compromises both data integrity and confidentiality. Specifically, user data may be corrupted due to copying to incorrect locations, and stale data may be exposed because partial blocks are not fully updated. The lack of memory mapping invalidation can cause processes to continue accessing outdated data after unshare operations.

References

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