ghsa-968h-6229-65gg
Vulnerability from github
Published
2024-07-12 15:31
Modified
2024-08-28 21:31
Severity ?
Details
In the Linux kernel, the following vulnerability has been resolved:
seg6: fix parameter passing when calling NF_HOOK() in End.DX4 and End.DX6 behaviors
input_action_end_dx4() and input_action_end_dx6() are called NF_HOOK() for PREROUTING hook, in PREROUTING hook, we should passing a valid indev, and a NULL outdev to NF_HOOK(), otherwise may trigger a NULL pointer dereference, as below:
[74830.647293] BUG: kernel NULL pointer dereference, address: 0000000000000090
[74830.655633] #PF: supervisor read access in kernel mode
[74830.657888] #PF: error_code(0x0000) - not-present page
[74830.659500] PGD 0 P4D 0
[74830.660450] Oops: 0000 [#1] PREEMPT SMP PTI
...
[74830.664953] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[74830.666569] RIP: 0010:rpfilter_mt+0x44/0x15e [ipt_rpfilter]
...
[74830.689725] Call Trace:
[74830.690402] <IRQ>
[74830.690953] ? show_trace_log_lvl+0x1c4/0x2df
[74830.692020] ? show_trace_log_lvl+0x1c4/0x2df
[74830.693095] ? ipt_do_table+0x286/0x710 [ip_tables]
[74830.694275] ? __die_body.cold+0x8/0xd
[74830.695205] ? page_fault_oops+0xac/0x140
[74830.696244] ? exc_page_fault+0x62/0x150
[74830.697225] ? asm_exc_page_fault+0x22/0x30
[74830.698344] ? rpfilter_mt+0x44/0x15e [ipt_rpfilter]
[74830.699540] ipt_do_table+0x286/0x710 [ip_tables]
[74830.700758] ? ip6_route_input+0x19d/0x240
[74830.701752] nf_hook_slow+0x3f/0xb0
[74830.702678] input_action_end_dx4+0x19b/0x1e0
[74830.703735] ? input_action_end_t+0xe0/0xe0
[74830.704734] seg6_local_input_core+0x2d/0x60
[74830.705782] lwtunnel_input+0x5b/0xb0
[74830.706690] __netif_receive_skb_one_core+0x63/0xa0
[74830.707825] process_backlog+0x99/0x140
[74830.709538] __napi_poll+0x2c/0x160
[74830.710673] net_rx_action+0x296/0x350
[74830.711860] __do_softirq+0xcb/0x2ac
[74830.713049] do_softirq+0x63/0x90
input_action_end_dx4() passing a NULL indev to NF_HOOK(), and finally trigger a NULL dereference in rpfilter_mt()->rpfilter_is_loopback():
static bool
rpfilter_is_loopback(const struct sk_buff *skb,
const struct net_device *in)
{
// in is NULL
return skb->pkt_type == PACKET_LOOPBACK ||
in->flags & IFF_LOOPBACK;
}
{ "affected": [], "aliases": [ "CVE-2024-40957" ], "database_specific": { "cwe_ids": [ "CWE-476" ], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2024-07-12T13:15:17Z", "severity": "MODERATE" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: fix parameter passing when calling NF_HOOK() in End.DX4 and End.DX6 behaviors\n\ninput_action_end_dx4() and input_action_end_dx6() are called NF_HOOK() for\nPREROUTING hook, in PREROUTING hook, we should passing a valid indev,\nand a NULL outdev to NF_HOOK(), otherwise may trigger a NULL pointer\ndereference, as below:\n\n [74830.647293] BUG: kernel NULL pointer dereference, address: 0000000000000090\n [74830.655633] #PF: supervisor read access in kernel mode\n [74830.657888] #PF: error_code(0x0000) - not-present page\n [74830.659500] PGD 0 P4D 0\n [74830.660450] Oops: 0000 [#1] PREEMPT SMP PTI\n ...\n [74830.664953] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\n [74830.666569] RIP: 0010:rpfilter_mt+0x44/0x15e [ipt_rpfilter]\n ...\n [74830.689725] Call Trace:\n [74830.690402] \u003cIRQ\u003e\n [74830.690953] ? show_trace_log_lvl+0x1c4/0x2df\n [74830.692020] ? show_trace_log_lvl+0x1c4/0x2df\n [74830.693095] ? ipt_do_table+0x286/0x710 [ip_tables]\n [74830.694275] ? __die_body.cold+0x8/0xd\n [74830.695205] ? page_fault_oops+0xac/0x140\n [74830.696244] ? exc_page_fault+0x62/0x150\n [74830.697225] ? asm_exc_page_fault+0x22/0x30\n [74830.698344] ? rpfilter_mt+0x44/0x15e [ipt_rpfilter]\n [74830.699540] ipt_do_table+0x286/0x710 [ip_tables]\n [74830.700758] ? ip6_route_input+0x19d/0x240\n [74830.701752] nf_hook_slow+0x3f/0xb0\n [74830.702678] input_action_end_dx4+0x19b/0x1e0\n [74830.703735] ? input_action_end_t+0xe0/0xe0\n [74830.704734] seg6_local_input_core+0x2d/0x60\n [74830.705782] lwtunnel_input+0x5b/0xb0\n [74830.706690] __netif_receive_skb_one_core+0x63/0xa0\n [74830.707825] process_backlog+0x99/0x140\n [74830.709538] __napi_poll+0x2c/0x160\n [74830.710673] net_rx_action+0x296/0x350\n [74830.711860] __do_softirq+0xcb/0x2ac\n [74830.713049] do_softirq+0x63/0x90\n\ninput_action_end_dx4() passing a NULL indev to NF_HOOK(), and finally\ntrigger a NULL dereference in rpfilter_mt()-\u003erpfilter_is_loopback():\n\n static bool\n rpfilter_is_loopback(const struct sk_buff *skb,\n \t const struct net_device *in)\n {\n // in is NULL\n return skb-\u003epkt_type == PACKET_LOOPBACK ||\n \t in-\u003eflags \u0026 IFF_LOOPBACK;\n }", "id": "GHSA-968h-6229-65gg", "modified": "2024-08-28T21:31:27Z", "published": "2024-07-12T15:31:28Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-40957" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/561475d53aa7e4511ee7cdba8728ded81cf1db1c" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/9a3bc8d16e0aacd65c31aaf23a2bced3288a7779" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/af90e3d73dc45778767b2fb6e7edd57ebe34380d" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/d62df86c172033679d744f07d89e93e367dd11f6" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/ec4d970b597ee5e17b0d8d73b7875197ce9a04d4" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "type": "CVSS_V3" } ] }
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