pfcp: fix socket lifetime on netdevice registration failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98849
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:39 UTC
Updated2026-10-19 10:19:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: pfcp: fix socket lifetime on netdevice registration failure pfcp_newlink() creates the UDP socket before register_netdevice(). If registration fails after pfcp_dev_init() succeeds, the core calls pfcp_dev_uninit(), which releases the socket and clears pfcp->sk. The newlink error path then releases it again, causing a NULL pointer dereference. This was observed with failslab fault injection: FAULT_INJECTION: forcing a failure. kobject: kobject_add_internal failed for pfcp0 (error: -12 parent: net) BUG: KASAN: null-ptr-deref in udp_tunnel_sock_release+0x1c/0x50 Read of size 8 at addr 0000000000000120 by task ip/1037 Call trace: show_stack+0x18/0x24 (C) dump_stack_lvl+0x78/0x90 print_report+0x468/0x5cc kasan_report+0xa4/0xf0 __asan_load8+0x7c/0xd0 udp_tunnel_sock_release+0x1c/0x50 pfcp_newlink+0x128/0x184 rtnl_newlink+0x848/0xe44 rtnetlink_rcv_msg+0x468/0x514 netlink_rcv_skb+0xc0/0x1f0 rtnetlink_rcv+0x18/0x24 netlink_unicast+0x4b8/0x558 netlink_sendmsg+0x2b8/0x584 ... Return from pfcp_del_sock() if pfcp->sk is NULL.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 76c8764ef36a5d37ea2e551bda28ac7f028383ba dcb8f6a79c3360a440c399d85df465a6e59351f1 git Not specified
CNA Linux Linux affected 76c8764ef36a5d37ea2e551bda28ac7f028383ba 4b8ce1686dea1a10805a0807bf492409b0300ee1 git Not specified
CNA Linux Linux affected 76c8764ef36a5d37ea2e551bda28ac7f028383ba 2cee3603ec1d9b5ec7f2121ea3efe9488e906f46 git Not specified
CNA Linux Linux affected 76c8764ef36a5d37ea2e551bda28ac7f028383ba 0f17d2e3dd9cda3ee6d94033d5e5489af168920d git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4b8ce1686dea1a10805a0807bf492409b0300ee1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f17d2e3dd9cda3ee6d94033d5e5489af168920d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2cee3603ec1d9b5ec7f2121ea3efe9488e906f46 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dcb8f6a79c3360a440c399d85df465a6e59351f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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