CVE-2024-26951 (GCVE-0-2024-26951)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:18 – Updated: 2025-05-04 09:00
VLAI?
Title
wireguard: netlink: check for dangling peer via is_dead instead of empty list
Summary
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: <TASK> 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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e7096c131e5161fa3b8e52a650d7719d2857adfd , < f52be46e3e6ecefc2539119784324f0cbc09620a (git)
Affected: e7096c131e5161fa3b8e52a650d7719d2857adfd , < 710a177f347282eea162aec8712beb1f42d5ad87 (git)
Affected: e7096c131e5161fa3b8e52a650d7719d2857adfd , < b7cea3a9af0853fdbb1b16633a458f991dde6aac (git)
Affected: e7096c131e5161fa3b8e52a650d7719d2857adfd , < 13d107794304306164481d31ce33f8fdb25a9c04 (git)
Affected: e7096c131e5161fa3b8e52a650d7719d2857adfd , < 7bedfe4cfa38771840a355970e4437cd52d4046b (git)
Affected: e7096c131e5161fa3b8e52a650d7719d2857adfd , < 302b2dfc013baca3dea7ceda383930d9297d231d (git)
Affected: e7096c131e5161fa3b8e52a650d7719d2857adfd , < 55b6c738673871c9b0edae05d0c97995c1ff08c4 (git)
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    Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.215 , ≤ 5.10.* (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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\"https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b\"}, {\"url\": \"https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d\"}, {\"url\": \"https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwireguard: netlink: check for dangling peer via is_dead instead of empty list\\n\\nIf all peers are removed via wg_peer_remove_all(), rather than setting\\npeer_list to empty, the peer is added to a temporary list with a head on\\nthe stack of wg_peer_remove_all(). If a netlink dump is resumed and the\\ncursored peer is one that has been removed via wg_peer_remove_all(), it\\nwill iterate from that peer and then attempt to dump freed peers.\\n\\nFix this by instead checking peer-\u003eis_dead, which was explictly created\\nfor this purpose. Also move up the device_update_lock lockdep assertion,\\nsince reading is_dead relies on that.\\n\\nIt can be reproduced by a small script like:\\n\\n    echo \\\"Setting config...\\\"\\n    ip link add dev wg0 type wireguard\\n    wg setconf wg0 /big-config\\n    (\\n            while true; do\\n                    echo \\\"Showing config...\\\"\\n                    wg showconf wg0 \u003e /dev/null\\n            done\\n    ) \u0026\\n    sleep 4\\n    wg setconf wg0 \u003c(printf \\\"[Peer]\\\\nPublicKey=$(wg genkey)\\\\n\\\")\\n\\nResulting in:\\n\\n    BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20\\n    Read of size 8 at addr ffff88811956ec70 by task wg/59\\n    CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5\\n    Call Trace:\\n     \u003cTASK\u003e\\n     dump_stack_lvl+0x47/0x70\\n     print_address_description.constprop.0+0x2c/0x380\\n     print_report+0xab/0x250\\n     kasan_report+0xba/0xf0\\n     __lock_acquire+0x182a/0x1b20\\n     lock_acquire+0x191/0x4b0\\n     down_read+0x80/0x440\\n     get_peer+0x140/0xcb0\\n     wg_get_device_dump+0x471/0x1130\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.215\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.84\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.3\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:00:32.262Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26951\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:00:32.262Z\", \"dateReserved\": \"2024-02-19T14:20:24.198Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:18:34.520Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.