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CVE-2025-68813

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : 6.12.64, <ad891bb3d079a46a821bf2b8867854645191bab0, <=6.1.*, <=6.12.*, <cdeff10851c37a002d87a035818ebd60fdb74447, 6c2fa855d8178699706b1192db2f1f8102b0ba1e, <25ab24df31f7af843c96a38e0781b9165216e1a8, 6.1.160, 8a430e56a6485267a1b2d3747209d26c54d1a34b, 6bd1ee0a993fc9574ae43c1994c54a60cb23a380, 0, 4.19.37, 6.6.120, <4.10, 5.15.198, <4.20, <dd72a93c80408f06327dd2d956eb1a656d0b5903, 3.18.139, <=5.10.*, <=6.6.*, ed0de45a1008991fdaa27a0152befcb74d126a8b, 6.18.3, 4.9.171, <4.5, <5.1, fbf569d2beee2a4a7a0bc8b619c26101d1211a88, <=6.18.*, 4.14.114, 5.1, 5.10.248, <4729ff0581fbb7ad098b6153b76b6f5aac94618a, <=*, ff71f99d5fb2daf54340e8b290d0bc4e6b4c1d38, 5.0.10, <=5.15.*, 6.19, <312d7cd88882fc6cadcc08b02287497aaaf94bcd, <3.19, <4.15, 3d988fcddbe7b8673a231958bd2fba61b5a7ced9, 4.4.179, <689a627d14788ad772e0fa24c2e57a23dbc7ce90

Description

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

Gravité et risque d'exploitation

CVE-2025-68813 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.21 %, ce qui la place devant 10.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.12.64, <ad891bb3d079a46a821bf2b8867854645191bab0, <=6.1.*, <=6.12.*, <cdeff10851c37a002d87a035818ebd60fdb74447, 6c2fa855d8178699706b1192db2f1f8102b0ba1e, <25ab24df31f7af843c96a38e0781b9165216e1a8, 6.1.160, 8a430e56a6485267a1b2d3747209d26c54d1a34b, 6bd1ee0a993fc9574ae43c1994c54a60cb23a380, 0, 4.19.37, 6.6.120, <4.10, 5.15.198, <4.20, <dd72a93c80408f06327dd2d956eb1a656d0b5903, 3.18.139, <=5.10.*, <=6.6.*, ed0de45a1008991fdaa27a0152befcb74d126a8b, 6.18.3, 4.9.171, <4.5, <5.1, fbf569d2beee2a4a7a0bc8b619c26101d1211a88, <=6.18.*, 4.14.114, 5.1, 5.10.248, <4729ff0581fbb7ad098b6153b76b6f5aac94618a, <=*, ff71f99d5fb2daf54340e8b290d0bc4e6b4c1d38, 5.0.10, <=5.15.*, 6.19, <312d7cd88882fc6cadcc08b02287497aaaf94bcd, <3.19, <4.15, 3d988fcddbe7b8673a231958bd2fba61b5a7ced9, 4.4.179, <689a627d14788ad772e0fa24c2e57a23dbc7ce90) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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