Linux Kernel up to 6.18.39/7.1.4/7.2-rc1 afs lib/debugobjects.c afs_lock_work race condition

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k1.45+

Summaryinfo

A vulnerability categorized as problematic has been discovered in Linux Kernel up to 6.18.39/7.1.4/7.2-rc1. Affected is the function afs_lock_work of the file lib/debugobjects.c of the component afs. The manipulation results in race condition. This vulnerability is reported as CVE-2026-72375. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.18.39/7.1.4/7.2-rc1. Affected is the function afs_lock_work of the file lib/debugobjects.c of the component afs. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: afs: Fix reinitialisation of the inode, in particular ->lock_work It seems that initalising afs_vnode::lock_work a single time in the slab's init function isn't sufficient for work_structs. This results in the DEBUG_OBJECTS debugging stuff producing a warning occasionally when running the generic/131 xfstest: ODEBUG: activate not available (active state 0) object: 0000000016d8760f object type: work_struct hint: afs_lock_work+0x0/0x220 WARNING: lib/debugobjects.c:629 at debug_print_object+0x4b/0x90, CPU#3: locktest/7695 ... CPU: 3 UID: 0 PID: 7695 Comm: locktest Tainted: G S 7.1.0-build3+ #2771 PREEMPT ... RIP: 0010:debug_print_object+0x65/0x90 ... Call Trace: <TASK> ? __pfx_afs_lock_work+0x10/0x10 debug_object_activate+0x122/0x170 insert_work+0x25/0x60 __queue_work+0x2e0/0x340 queue_delayed_work_on+0x48/0x70 afs_fl_release_private+0x57/0x70 locks_release_private+0x5c/0xa0 locks_free_lock+0xe/0x20 posix_lock_inode+0x55f/0x5b0 locks_lock_inode_wait+0x81/0x140 ? file_write_and_wait_range+0x50/0x70 afs_lock+0xcd/0x110 fcntl_setlk+0x10d/0x260 do_fcntl+0x24e/0x5b0 __do_sys_fcntl+0x6a/0x90 do_syscall_64+0x11e/0x310 entry_SYSCALL_64_after_hwframe+0x71/0x79 Fix this by reinitialising ->lock_work after allocating an inode. Also, flush ->lock_work when the inode is being evicted to make sure it's not still running.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-72375 since 08/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/15/2026).

Upgrading to version 6.18.40, 7.1.5 or 7.2-rc2 eliminates this vulnerability. Applying the patch 63d3f283858fae097fb09ddd4ce46bb0bc1f9d01/ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28/5597fbd1e7c161914f20315a726e54025b0fdadb is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.4
VulDB Temp Score: 5.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

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

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.40/7.1.5/7.2-rc2
Patch: 63d3f283858fae097fb09ddd4ce46bb0bc1f9d01/ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28/5597fbd1e7c161914f20315a726e54025b0fdadb

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72375 (🔒)
GCVE (CVE): GCVE-0-2026-72375
GCVE (VulDB): GCVE-100-390972

Entryinfo

Created: 08/15/2026 16:43
Changes: 08/15/2026 16:43 (60)
Complete: 🔍
Cache ID: 216::103

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