CVE-2025-68813 (GCVE-0-2025-68813)
Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-01-13 15:29
VLAI?
Title
ipvs: fix ipv4 null-ptr-deref in route error path
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipvs: fix ipv4 null-ptr-deref in route error path
The IPv4 code path in __ip_vs_get_out_rt() calls dst_link_failure()
without ensuring skb->dev is set, leading to a NULL pointer dereference
in fib_compute_spec_dst() when ipv4_link_failure() attempts to send
ICMP destination unreachable messages.
The issue emerged after commit ed0de45a1008 ("ipv4: recompile ip options
in ipv4_link_failure") started calling __ip_options_compile() from
ipv4_link_failure(). This code path eventually calls fib_compute_spec_dst()
which dereferences skb->dev. An attempt was made to fix the NULL skb->dev
dereference in commit 0113d9c9d1cc ("ipv4: fix null-deref in
ipv4_link_failure"), but it only addressed the immediate dev_net(skb->dev)
dereference by using a fallback device. The fix was incomplete because
fib_compute_spec_dst() later in the call chain still accesses skb->dev
directly, which remains NULL when IPVS calls dst_link_failure().
The crash occurs when:
1. IPVS processes a packet in NAT mode with a misconfigured destination
2. Route lookup fails in __ip_vs_get_out_rt() before establishing a route
3. The error path calls dst_link_failure(skb) with skb->dev == NULL
4. ipv4_link_failure() → ipv4_send_dest_unreach() →
__ip_options_compile() → fib_compute_spec_dst()
5. fib_compute_spec_dst() dereferences NULL skb->dev
Apply the same fix used for IPv6 in commit 326bf17ea5d4 ("ipvs: fix
ipv6 route unreach panic"): set skb->dev from skb_dst(skb)->dev before
calling dst_link_failure().
KASAN: null-ptr-deref in range [0x0000000000000328-0x000000000000032f]
CPU: 1 PID: 12732 Comm: syz.1.3469 Not tainted 6.6.114 #2
RIP: 0010:__in_dev_get_rcu include/linux/inetdevice.h:233
RIP: 0010:fib_compute_spec_dst+0x17a/0x9f0 net/ipv4/fib_frontend.c:285
Call Trace:
<TASK>
spec_dst_fill net/ipv4/ip_options.c:232
spec_dst_fill net/ipv4/ip_options.c:229
__ip_options_compile+0x13a1/0x17d0 net/ipv4/ip_options.c:330
ipv4_send_dest_unreach net/ipv4/route.c:1252
ipv4_link_failure+0x702/0xb80 net/ipv4/route.c:1265
dst_link_failure include/net/dst.h:437
__ip_vs_get_out_rt+0x15fd/0x19e0 net/netfilter/ipvs/ip_vs_xmit.c:412
ip_vs_nat_xmit+0x1d8/0xc80 net/netfilter/ipvs/ip_vs_xmit.c:764
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
ed0de45a1008991fdaa27a0152befcb74d126a8b , < cdeff10851c37a002d87a035818ebd60fdb74447
(git)
Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < 4729ff0581fbb7ad098b6153b76b6f5aac94618a (git) Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < 25ab24df31f7af843c96a38e0781b9165216e1a8 (git) Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < 689a627d14788ad772e0fa24c2e57a23dbc7ce90 (git) Affected: ed0de45a1008991fdaa27a0152befcb74d126a8b , < ad891bb3d079a46a821bf2b8867854645191bab0 (git) Affected: 6c2fa855d8178699706b1192db2f1f8102b0ba1e (git) Affected: fbf569d2beee2a4a7a0bc8b619c26101d1211a88 (git) Affected: ff71f99d5fb2daf54340e8b290d0bc4e6b4c1d38 (git) Affected: 3d988fcddbe7b8673a231958bd2fba61b5a7ced9 (git) Affected: 8a430e56a6485267a1b2d3747209d26c54d1a34b (git) Affected: 6bd1ee0a993fc9574ae43c1994c54a60cb23a380 (git) |
||
{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix ipv4 null-ptr-deref in route error path\n\nThe IPv4 code path in __ip_vs_get_out_rt() calls dst_link_failure()\nwithout ensuring skb-\u003edev is set, leading to a NULL pointer dereference\nin fib_compute_spec_dst() when ipv4_link_failure() attempts to send\nICMP destination unreachable messages.\n\nThe issue emerged after commit ed0de45a1008 (\"ipv4: recompile ip options\nin ipv4_link_failure\") started calling __ip_options_compile() from\nipv4_link_failure(). This code path eventually calls fib_compute_spec_dst()\nwhich dereferences skb-\u003edev. An attempt was made to fix the NULL skb-\u003edev\ndereference in commit 0113d9c9d1cc (\"ipv4: fix null-deref in\nipv4_link_failure\"), but it only addressed the immediate dev_net(skb-\u003edev)\ndereference by using a fallback device. The fix was incomplete because\nfib_compute_spec_dst() later in the call chain still accesses skb-\u003edev\ndirectly, which remains NULL when IPVS calls dst_link_failure().\n\nThe crash occurs when:\n1. IPVS processes a packet in NAT mode with a misconfigured destination\n2. Route lookup fails in __ip_vs_get_out_rt() before establishing a route\n3. The error path calls dst_link_failure(skb) with skb-\u003edev == NULL\n4. ipv4_link_failure() \u2192 ipv4_send_dest_unreach() \u2192\n __ip_options_compile() \u2192 fib_compute_spec_dst()\n5. fib_compute_spec_dst() dereferences NULL skb-\u003edev\n\nApply the same fix used for IPv6 in commit 326bf17ea5d4 (\"ipvs: fix\nipv6 route unreach panic\"): set skb-\u003edev from skb_dst(skb)-\u003edev before\ncalling dst_link_failure().\n\nKASAN: null-ptr-deref in range [0x0000000000000328-0x000000000000032f]\nCPU: 1 PID: 12732 Comm: syz.1.3469 Not tainted 6.6.114 #2\nRIP: 0010:__in_dev_get_rcu include/linux/inetdevice.h:233\nRIP: 0010:fib_compute_spec_dst+0x17a/0x9f0 net/ipv4/fib_frontend.c:285\nCall Trace:\n \u003cTASK\u003e\n spec_dst_fill net/ipv4/ip_options.c:232\n spec_dst_fill net/ipv4/ip_options.c:229\n __ip_options_compile+0x13a1/0x17d0 net/ipv4/ip_options.c:330\n ipv4_send_dest_unreach net/ipv4/route.c:1252\n ipv4_link_failure+0x702/0xb80 net/ipv4/route.c:1265\n dst_link_failure include/net/dst.h:437\n __ip_vs_get_out_rt+0x15fd/0x19e0 net/netfilter/ipvs/ip_vs_xmit.c:412\n ip_vs_nat_xmit+0x1d8/0xc80 net/netfilter/ipvs/ip_vs_xmit.c:764"
}
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{
"url": "https://git.kernel.org/stable/c/cdeff10851c37a002d87a035818ebd60fdb74447"
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"url": "https://git.kernel.org/stable/c/4729ff0581fbb7ad098b6153b76b6f5aac94618a"
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},
{
"url": "https://git.kernel.org/stable/c/ad891bb3d079a46a821bf2b8867854645191bab0"
}
],
"title": "ipvs: fix ipv4 null-ptr-deref in route error path",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"cveId": "CVE-2025-68813",
"datePublished": "2026-01-13T15:29:18.483Z",
"dateReserved": "2025-12-24T10:30:51.047Z",
"dateUpdated": "2026-01-13T15:29:18.483Z",
"state": "PUBLISHED"
},
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"nvd": "{\"cve\":{\"id\":\"CVE-2025-68813\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:16:03.523\",\"lastModified\":\"2026-01-13T16:16:03.523\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipvs: fix ipv4 null-ptr-deref in route error path\\n\\nThe IPv4 code path in __ip_vs_get_out_rt() calls dst_link_failure()\\nwithout ensuring skb-\u003edev is set, leading to a NULL pointer dereference\\nin fib_compute_spec_dst() when ipv4_link_failure() attempts to send\\nICMP destination unreachable messages.\\n\\nThe issue emerged after commit ed0de45a1008 (\\\"ipv4: recompile ip options\\nin ipv4_link_failure\\\") started calling __ip_options_compile() from\\nipv4_link_failure(). This code path eventually calls fib_compute_spec_dst()\\nwhich dereferences skb-\u003edev. An attempt was made to fix the NULL skb-\u003edev\\ndereference in commit 0113d9c9d1cc (\\\"ipv4: fix null-deref in\\nipv4_link_failure\\\"), but it only addressed the immediate dev_net(skb-\u003edev)\\ndereference by using a fallback device. The fix was incomplete because\\nfib_compute_spec_dst() later in the call chain still accesses skb-\u003edev\\ndirectly, which remains NULL when IPVS calls dst_link_failure().\\n\\nThe crash occurs when:\\n1. IPVS processes a packet in NAT mode with a misconfigured destination\\n2. Route lookup fails in __ip_vs_get_out_rt() before establishing a route\\n3. The error path calls dst_link_failure(skb) with skb-\u003edev == NULL\\n4. ipv4_link_failure() \u2192 ipv4_send_dest_unreach() \u2192\\n __ip_options_compile() \u2192 fib_compute_spec_dst()\\n5. fib_compute_spec_dst() dereferences NULL skb-\u003edev\\n\\nApply the same fix used for IPv6 in commit 326bf17ea5d4 (\\\"ipvs: fix\\nipv6 route unreach panic\\\"): set skb-\u003edev from skb_dst(skb)-\u003edev before\\ncalling dst_link_failure().\\n\\nKASAN: null-ptr-deref in range [0x0000000000000328-0x000000000000032f]\\nCPU: 1 PID: 12732 Comm: syz.1.3469 Not tainted 6.6.114 #2\\nRIP: 0010:__in_dev_get_rcu include/linux/inetdevice.h:233\\nRIP: 0010:fib_compute_spec_dst+0x17a/0x9f0 net/ipv4/fib_frontend.c:285\\nCall Trace:\\n \u003cTASK\u003e\\n spec_dst_fill net/ipv4/ip_options.c:232\\n spec_dst_fill net/ipv4/ip_options.c:229\\n __ip_options_compile+0x13a1/0x17d0 net/ipv4/ip_options.c:330\\n ipv4_send_dest_unreach net/ipv4/route.c:1252\\n ipv4_link_failure+0x702/0xb80 net/ipv4/route.c:1265\\n dst_link_failure include/net/dst.h:437\\n __ip_vs_get_out_rt+0x15fd/0x19e0 net/netfilter/ipvs/ip_vs_xmit.c:412\\n ip_vs_nat_xmit+0x1d8/0xc80 net/netfilter/ipvs/ip_vs_xmit.c:764\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/25ab24df31f7af843c96a38e0781b9165216e1a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4729ff0581fbb7ad098b6153b76b6f5aac94618a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/689a627d14788ad772e0fa24c2e57a23dbc7ce90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ad891bb3d079a46a821bf2b8867854645191bab0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdeff10851c37a002d87a035818ebd60fdb74447\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- 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.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- 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.
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