CVE-2026-31665

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-31665
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: fix use-after-free in timeout object destroy nft_ct_timeout_obj_destroy() frees the timeout object with kfree() immediately after nf_ct_untimeout(), without waiting for an RCU grace period. Concurrent packet processing on other CPUs may still hold RCU-protected references to the timeout object obtained via rcu_dereference() in nf_ct_timeout_data(). Add an rcu_head to struct nf_ct_timeout and use kfree_rcu() to defer freeing until after an RCU grace period, matching the approach already used in nfnetlink_cttimeout.c. KASAN report: BUG: KASAN: slab-use-after-free in nf_conntrack_tcp_packet+0x1381/0x29d0 Read of size 4 at addr ffff8881035fe19c by task exploit/80 Call Trace: nf_conntrack_tcp_packet+0x1381/0x29d0 nf_conntrack_in+0x612/0x8b0 nf_hook_slow+0x70/0x100 __ip_local_out+0x1b2/0x210 tcp_sendmsg_locked+0x722/0x1580 __sys_sendto+0x2d8/0x320 Allocated by task 75: nft_ct_timeout_obj_init+0xf6/0x290 nft_obj_init+0x107/0x1b0 nf_tables_newobj+0x680/0x9c0 nfnetlink_rcv_batch+0xc29/0xe00 Freed by task 26: nft_obj_destroy+0x3f/0xa0 nf_tables_trans_destroy_work+0x51c/0x5c0 process_one_work+0x2c4/0x5a0

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/070abdf1b04325b21a20a2a0c39a2208af107275 Patch
https://git.kernel.org/stable/c/aa7cfa16f98f8ec3e6d47c34e1a8c1ae4b9b8b77 Patch
https://git.kernel.org/stable/c/b42aca3660dc2627a29a38131597ca610dc451f9 Patch
https://git.kernel.org/stable/c/c458fc1c278a65ad5381083121d39a479973ebed Patch
https://git.kernel.org/stable/c/c581e5c8f2b59158f62efe61c1a3dc36189081ff Patch
https://git.kernel.org/stable/c/d0983b48c10d1509fd795c155f8b1e832e1369ff Patch
https://git.kernel.org/stable/c/f16fe84879a5280f05ebbcea593a189ba0f3e79a Patch
https://git.kernel.org/stable/c/f8dca15a1b190787bbd03285304b569631160eda Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.19:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
History

27 Apr 2026, 20:00

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/070abdf1b04325b21a20a2a0c39a2208af107275 - () https://git.kernel.org/stable/c/070abdf1b04325b21a20a2a0c39a2208af107275 - Patch
References () https://git.kernel.org/stable/c/aa7cfa16f98f8ec3e6d47c34e1a8c1ae4b9b8b77 - () https://git.kernel.org/stable/c/aa7cfa16f98f8ec3e6d47c34e1a8c1ae4b9b8b77 - Patch
References () https://git.kernel.org/stable/c/b42aca3660dc2627a29a38131597ca610dc451f9 - () https://git.kernel.org/stable/c/b42aca3660dc2627a29a38131597ca610dc451f9 - Patch
References () https://git.kernel.org/stable/c/c458fc1c278a65ad5381083121d39a479973ebed - () https://git.kernel.org/stable/c/c458fc1c278a65ad5381083121d39a479973ebed - Patch
References () https://git.kernel.org/stable/c/c581e5c8f2b59158f62efe61c1a3dc36189081ff - () https://git.kernel.org/stable/c/c581e5c8f2b59158f62efe61c1a3dc36189081ff - Patch
References () https://git.kernel.org/stable/c/d0983b48c10d1509fd795c155f8b1e832e1369ff - () https://git.kernel.org/stable/c/d0983b48c10d1509fd795c155f8b1e832e1369ff - Patch
References () https://git.kernel.org/stable/c/f16fe84879a5280f05ebbcea593a189ba0f3e79a - () https://git.kernel.org/stable/c/f16fe84879a5280f05ebbcea593a189ba0f3e79a - Patch
References () https://git.kernel.org/stable/c/f8dca15a1b190787bbd03285304b569631160eda - () https://git.kernel.org/stable/c/f8dca15a1b190787bbd03285304b569631160eda - Patch
CWE CWE-416
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.19:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*

27 Apr 2026, 15:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8

24 Apr 2026, 15:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-24 15:16

Updated : 2026-04-27 20:00

NVD link : CVE-2026-31665

Mitre link : CVE-2026-31665

CVE.ORG link : CVE-2026-31665

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

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