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CVE-2026-31515

Updated on 22 Apr 2026

Severity

5.5 Medium severity

Details

CVSS score
5.5
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

af_key: validate families in pfkey_send_migrate()

syzbot was able to trigger a crash in skb_put() [1]

Issue is that pfkey_send_migrate() does not check old/new families, and that set_ipsecrequest() @family argument was truncated, thus possibly overfilling the skb.

Validate families early, do not wait set_ipsecrequest().

[1]

skbuff: skb_over_panic: text:ffffffff8a752120 len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev: kernel BUG at net/core/skbuff.c:214 ! Call Trace: skb_over_panic net/core/skbuff.c:219 [inline] skb_put+0x159/0x210 net/core/skbuff.c:2655 skb_put_zero include/linux/skbuff.h:2788 [inline] set_ipsecrequest net/key/af_key.c:3532 [inline] pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636 km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848 xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705 xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150

Details

Affected product:
AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 6 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 7 ELS , Debian 10 ELS , Oracle Linux 6 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
Affected packages:
kernel @ 3.10.0 (+18 more)

Fixes

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
AlmaLinux 9.2 ESU Released
17 kernels
  • 5.14.0-284.1101.el9_2.tuxcare.7.els20
  • 5.14.0-284.1101.el9_2.tuxcare.7.els21
  • 5.14.0-284.1101.el9_2.tuxcare.7.els23
  • 5.14.0-284.1101.el9_2.tuxcare.7.els22
  • 5.14.0-284.1101.el9_2.tuxcare.7.els14
  • 5.14.0-284.1101.el9_2.tuxcare.7.els18
  • 5.14.0-284.1101.el9_2.tuxcare.7.els16
  • 5.14.0-284.1101.el9_2.tuxcare.7.els15
  • 5.14.0-284.1101.el9_2.tuxcare.7.els17
  • 5.14.0-284.1101.el9_2.tuxcare.7.els19
  • 5.14.0-284.1101.el9_2.tuxcare.7.els24
  • 5.14.0-284.1101.el9_2.tuxcare.7.els25
  • 5.14.0-284.1101.el9_2.tuxcare.7.els26
  • 5.14.0-284.1101.el9_2.tuxcare.7.els27
  • 5.14.0-284.1101.el9_2.tuxcare.7.els28
  • 5.14.0-284.1101.el9_2.tuxcare.7.els29
  • 5.14.0-284.1101.el9_2.tuxcare.7.els30
AlmaLinux 9.6 ESU Released
11 kernels
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els1
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els2
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els3
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els4
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els5
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els6
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els7
  • 5.14.0-570.62.1.el9_6.tuxcare.5.els1
  • 5.14.0-570.62.1.el9_6.tuxcare.5.els2
  • 5.14.0-570.62.1.el9_6.tuxcare.5.els3
  • 5.14.0-570.62.1.el9_6.tuxcare.5.els4
Amazon Linux 2023 Planned —
Debian 11 Released
37 kernels
  • 5.10.46-5
  • 5.10.70-1
  • 5.10.46-4
  • 5.10.84-1
  • 5.10.92-1
  • 5.10.92-2
  • 5.10.103-1
  • 5.10.106-1
  • 5.10.113-1
  • 5.10.120-1
  • 5.10.127-1
  • 5.10.127-2
  • 5.10.136-1
  • 5.10.140-1
  • 5.10.149-1
  • 5.10.149-2
  • 5.10.158-2
  • 5.10.162-1
  • 5.10.179-1
  • 5.10.179-2
  • 5.10.179-3
  • 5.10.179-5
  • 5.10.191-1
  • 5.10.197-1
  • 5.10.178-3
  • 5.10.205-2
  • 5.10.205-1
  • 5.10.209-2
  • 5.10.216-1
  • 5.10.218-1
  • 5.10.221-1
  • 5.10.223-1
  • 5.10.226-1
  • 5.10.234-1
  • 5.10.237-1
  • 5.10.244-1
  • 5.10.247-1
Debian 11 cloud Released
17 kernels
  • 5.10.113-1
  • 5.10.179-2
  • 5.10.179-3
  • 5.10.179-5
  • 5.10.191-1
  • 5.10.197-1
  • 5.10.205-2
  • 5.10.209-2
  • 5.10.216-1
  • 5.10.218-1
  • 5.10.221-1
  • 5.10.223-1
  • 5.10.226-1
  • 5.10.234-1
  • 5.10.237-1
  • 5.10.244-1
  • 5.10.247-1
Debian 12 Released
35 kernels
  • 6.1.38-1
  • 6.1.38-2
  • 6.1.38-4
  • 6.1.52-1
  • 6.1.55-1
  • 6.1.64-1
  • 6.1.66-1
  • 6.1.69-1
  • 6.1.76-1
  • 6.1.27-1
  • 6.1.67-1
  • 6.1.85-1
  • 6.1.90-1
  • 6.1.94-1
  • 6.1.99-1
  • 6.1.106-3
  • 6.1.112-1
  • 6.1.115-1
  • 6.1.119-1
  • 6.1.123-1
  • 6.1.128-1
  • 6.1.124-1
  • 6.1.129-1
  • 6.1.133-1
  • 6.1.135-1
  • 6.1.137-1
  • 6.1.140-1
  • 6.1.139-1
  • 6.1.147-1
  • 6.1.148-1
  • 6.1.153-1
  • 6.1.158-1
  • 6.1.159-1
  • 6.1.162-1
  • 6.1.164-1
Debian 13 Planned —
Ubuntu 22.04 Planned —
Ubuntu 24.04 Planned —