Linux Kernel up to 7.2.0 ocfs2 ocfs2_calc_xattr_set_need resource consumption

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5.3	$0-$5k	0.41-

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 7.2.0. The impacted element is the function ocfs2_calc_xattr_set_need of the component ocfs2. Executing a manipulation can lead to resource consumption. The identification of this vulnerability is CVE-2026-80809. The attack can only be executed locally. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 7.2.0. This vulnerability affects the function ocfs2_calc_xattr_set_need of the component ocfs2. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix missing metadata reservation for large xattrs [BUG] lsetxattr() panics the kernel when setting a large xattr value on a fragmented filesystem where the file already has an external xattr block. [CAUSE] ocfs2_calc_xattr_set_need() never reserves metadata blocks for a new xattr value's extent tree when the file already has an external xattr block. The not_found path leaves meta_add at zero, so meta_ac is NULL when ocfs2_xattr_extend_allocation() runs. A new value root has room for a single extent record. On a fragmented filesystem, the allocator cannot satisfy the xattr value in one contiguous run, so each non-contiguous run requires its own extent record. When the value root's extent list is full and meta_ac is NULL, ocfs2_add_clusters_in_btree() returns RESTART_META, and ocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META). [FIX] The case where no xattr block exists yet already calls ocfs2_extend_meta_needed(&def_xv.xv.xr_list) to reserve value tree metadata. Add the same reservation to the case where an xattr block already exists, making the two cases consistent. Replace the BUG_ON with a -ENOSPC return so that if RESTART_META is returned despite the reservation, the error propagates to userspace instead of panicking the kernel.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-80809 since 08/26/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version 5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.47, 7.1.11, 7.2.1 or 7.3-rc1 eliminates this vulnerability. Applying the patch 743ac908282ac97ef6e73ac3a92df2cc8ecb7479/04ba24bce61c917b5b3009f0db470cbb72e26a0d/b4663405ae29d36011cd712d243456f3f9ab700d/6a009f1e61b11d9e23d3c5aa1dacfb010945da45/b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec/6176313622e34fa3e2b66b9d0682d1e1c6b365c5/a3ccb57086dd7652d5ecb826486144198a98a8e9/50f0cbec45b0f3fd7e1263d01916518dbf31eb3f/0cdc7dde00ec63ac714271fa8b2918d630b8da1a is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.266
• 5.15.217
• 6.1.184
• 6.6.153
• 6.12.105
• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 6.18.30
• 6.18.31
• 6.18.32
• 6.18.33
• 6.18.34
• 6.18.35
• 6.18.36
• 6.18.37
• 6.18.38
• 6.18.39
• 6.18.40
• 6.18.41
• 6.18.42
• 6.18.43
• 6.18.44
• 6.18.45
• 6.18.46
• 7.0
• 7.1
• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.1.8
• 7.1.9
• 7.1.10
• 7.2.0

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.267/5.15.218/6.1.185/6.6.154/6.12.106/6.18.47/7.1.11/7.2.1/7.3-rc1
Patch: 743ac908282ac97ef6e73ac3a92df2cc8ecb7479/04ba24bce61c917b5b3009f0db470cbb72e26a0d/b4663405ae29d36011cd712d243456f3f9ab700d/6a009f1e61b11d9e23d3c5aa1dacfb010945da45/b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec/6176313622e34fa3e2b66b9d0682d1e1c6b365c5/a3ccb57086dd7652d5ecb826486144198a98a8e9/50f0cbec45b0f3fd7e1263d01916518dbf31eb3f/0cdc7dde00ec63ac714271fa8b2918d630b8da1a

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80809 (🔒)
GCVE (CVE): GCVE-0-2026-80809
GCVE (VulDB): GCVE-100-398944

Entryinfo

Created: 09/04/2026 18:27
Changes: 09/04/2026 18:27 (59)
Complete: 🔍
Cache ID: 216::103

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Discussion

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