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

Type: advisorySource: Official CVE List1 source record

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 > /dev/null done ) & sleep 4 wg setconf wg0 <(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: 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

Announced Source revision 1
Original source ↗

CVE-2024-26951

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2024-26951

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
        "lessThan": "f52be46e3e6ecefc2539119784324f0cbc09620a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
        "lessThan": "710a177f347282eea162aec8712beb1f42d5ad87",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
        "lessThan": "b7cea3a9af0853fdbb1b16633a458f991dde6aac",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
        "lessThan": "13d107794304306164481d31ce33f8fdb25a9c04",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
        "lessThan": "7bedfe4cfa38771840a355970e4437cd52d4046b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
        "lessThan": "302b2dfc013baca3dea7ceda383930d9297d231d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
        "lessThan": "55b6c738673871c9b0edae05d0c97995c1ff08c4",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/wireguard/netlink.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.215",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.154",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.84",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.8.*"
      },
      {
        "status": "unaffected",
        "version": "6.9",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/wireguard/netlink.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-26951

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#26466 · Revision 1
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Publisher date
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