CVE-2024-26951

2024-05-0106:15:11

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux kernel

wireguard

netlink vulnerability

fixed

cve-2024-26951

security

6.4 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.2%

JSON

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

wireguard: netlink: check for dangling peer via is_dead instead of empty list

If all peers are removed via wg_peer_remove_all(), rather than setting
peer_list to empty, the peer is added to a temporary list with a head on
the stack of wg_peer_remove_all(). If a netlink dump is resumed and the
cursored peer is one that has been removed via wg_peer_remove_all(), it
will iterate from that peer and then attempt to dump freed peers.

Fix this by instead checking peer->is_dead, which was explictly created
for this purpose. Also move up the device_update_lock lockdep assertion,
since reading is_dead relies on that.

It can be reproduced by a small script like:

echo "Setting config..."
ip link add dev wg0 type wireguard
wg setconf wg0 /big-config
(
        while true; do
                echo "Showing config..."
                wg showconf wg0 &gt; /dev/null
        done
) &
sleep 4
wg setconf wg0 &lt;(printf "[Peer]\nPublicKey=$(wg genkey)\n")

Resulting in:

BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20
Read of size 8 at addr ffff88811956ec70 by task wg/59
CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5
Call Trace:
 &lt;TASK&gt;
 dump_stack_lvl+0x47/0x70
 print_address_description.constprop.0+0x2c/0x380
 print_report+0xab/0x250
 kasan_report+0xba/0xf0
 __lock_acquire+0x182a/0x1b20
 lock_acquire+0x191/0x4b0
 down_read+0x80/0x440
 get_peer+0x140/0xcb0
 wg_get_device_dump+0x471/0x1130

Affected configurations

Vulners

Node

linuxlinux_kernelRange5.6–5.10.215

linuxlinux_kernelRange5.11.0–5.15.154

linuxlinux_kernelRange5.16.0–6.1.84

linuxlinux_kernelRange6.2.0–6.6.24

linuxlinux_kernelRange6.7.0–6.7.12

linuxlinux_kernelRange6.8.0–6.8.3

linuxlinux_kernelRange6.9.0≥

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/wireguard/netlink.c"
    ],
    "versions": [
      {
        "version": "e7096c131e51",
        "lessThan": "f52be46e3e6e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e7096c131e51",
        "lessThan": "710a177f3472",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e7096c131e51",
        "lessThan": "b7cea3a9af08",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e7096c131e51",
        "lessThan": "13d107794304",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e7096c131e51",
        "lessThan": "7bedfe4cfa38",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e7096c131e51",
        "lessThan": "302b2dfc013b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e7096c131e51",
        "lessThan": "55b6c7386738",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/wireguard/netlink.c"
    ],
    "versions": [
      {
        "version": "5.6",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.6",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.215",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.154",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.84",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.24",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.12",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.3",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]