Linux Kernel up to 7.3-rc3 RDS RDMA Interface rds_ib_cm_connect_complete locking

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.59

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been declared as critical. Affected by this issue is the function rds_ib_cm_connect_complete of the component RDS RDMA Interface. Such manipulation leads to locking. This vulnerability is referenced as CVE-2026-98257. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3 and classified as critical. Affected by this issue is the function rds_ib_cm_connect_complete of the component RDS RDMA Interface. The manipulation with an unknown input leads to a locking vulnerability. Using CWE to declare the problem leads to CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: rds: ib: use rds_conn_drop() on protocol version mismatch rds_ib_cm_connect_complete() runs from the RDMA-CM event handler with conn->c_cm_lock held. When the peer negotiates a protocol version older than RDS_PROTOCOL_COMPAT_VERSION, the handler calls rds_conn_destroy(), which is only safe in the rmmod path: it synchronously tears the connection down and flush_work()es the shutdown work cp_down_w. That shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is the very lock the event handler still holds, so the flush never completes: the two workers wait on each other and the RDS connection workqueues stall for good. All other RDMA-CM failure paths (REJECTED, CONNECT_ERROR, DISCONNECTED) use rds_conn_drop(), which marks the connection RDS_CONN_ERROR and schedules the shutdown work asynchronously. Use it here as well.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-98257 since 09/25/2026. The exploitation is known to be easy. The attack may be launched 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 10/06/2026).

Upgrading to version 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch 424019be3f637da76b74f44a40034669acbb166f/14fb90067d13f4494cff0f03243fae3cf2911cbc/344c72a0bc2703a6de4918ed935850e07dae3af2/b5c9f2951d330d4a198a64d6e60f79b4bd6ef078/d392b16acd0908f077289aad8bba066ff16de336/65ca0a5037152a5a80b8fe6aac80eb80458be573/7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8/f97d8c7bab7843631206a114986c9059da03efeb is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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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: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Locking
CWE: CWE-667
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 5.10.271/5.15.222/6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: 424019be3f637da76b74f44a40034669acbb166f/14fb90067d13f4494cff0f03243fae3cf2911cbc/344c72a0bc2703a6de4918ed935850e07dae3af2/b5c9f2951d330d4a198a64d6e60f79b4bd6ef078/d392b16acd0908f077289aad8bba066ff16de336/65ca0a5037152a5a80b8fe6aac80eb80458be573/7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8/f97d8c7bab7843631206a114986c9059da03efeb

Timelineinfo

09/25/2026 CVE reserved
10/06/2026 +11 days Advisory disclosed
10/06/2026 +0 days VulDB entry created
10/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98257 (🔒)
GCVE (CVE): GCVE-0-2026-98257
GCVE (VulDB): GCVE-100-414140

Entryinfo

Created: 10/06/2026 13:06
Changes: 10/06/2026 13:06 (59)
Complete: 🔍
Cache ID: 216::103

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