Linux Kernel up to 6.12.100/6.18.41/7.1.5/7.2-rc4 RDS TCP net/rds/tcp.c rds_tcp_skbuf_handler use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.7$5k-$25k0.41-

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 6.12.100/6.18.41/7.1.5/7.2-rc4. Affected is the function rds_tcp_skbuf_handler of the file net/rds/tcp.c of the component RDS TCP. The manipulation leads to use after free. This vulnerability is listed as CVE-2026-68290. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.100/6.18.41/7.1.5/7.2-rc4. It has been rated as very critical. This issue affects the function rds_tcp_skbuf_handler of the file net/rds/tcp.c of the component RDS TCP. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: rds: tcp: unregister sysctl before tearing down listen socket rds_tcp_exit_net() frees the per-netns RDS TCP listen socket via rds_tcp_kill_sock() before unregistering the per-netns sysctl table. Since rds_tcp_skbuf_handler() derives the netns from rtn->rds_tcp_listen_sock->sk, a concurrent sysctl write can race with netns teardown and dereference the freed socket/sk. KASAN reports the race as: BUG: KASAN: slab-use-after-free in rds_tcp_skbuf_handler+0x2aa/0x2e0 rds_tcp_skbuf_handler net/rds/tcp.c:721 proc_sys_call_handler fs/proc/proc_sysctl.c vfs_write fs/read_write.c __x64_sys_pwrite64 fs/read_write.c Fix this by unregistering the RDS TCP sysctl table before calling rds_tcp_kill_sock(). unregister_net_sysctl_table() prevents new sysctl handlers from starting and waits for in-flight handlers to finish, so the listen socket can then be released safely. The fix was tested against the linked reproducer.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-68290 since 07/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are necessary for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/10/2026).

Upgrading to version 6.12.101, 6.18.42, 7.1.6 or 7.2-rc5 eliminates this vulnerability. Applying the patch 80fffed08dc1c10e971066941d2daa56253f1552/16df2d154ec82e2f7e7585b4fa154751ba37729a/3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d/167e54c703ccd4fa028feb568b0d1002020cff86 is able to eliminate this problem.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.1
VulDB Temp Score: 8.7
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: Use after free
CWE: CWE-416 / CWE-119
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 6.12.101/6.18.42/7.1.6/7.2-rc5
Patch: 80fffed08dc1c10e971066941d2daa56253f1552/16df2d154ec82e2f7e7585b4fa154751ba37729a/3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d/167e54c703ccd4fa028feb568b0d1002020cff86

Timelineinfo

07/30/2026 CVE reserved
08/10/2026 +11 days Advisory disclosed
08/10/2026 +0 days VulDB entry created
08/10/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-68290 (🔒)
GCVE (CVE): GCVE-0-2026-68290
GCVE (VulDB): GCVE-100-387683

Entryinfo

Created: 08/10/2026 17:35
Changes: 08/10/2026 17:35 (60)
Complete: 🔍
Cache ID: 216::103

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