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vuln-cve/data/2025/21xxx/CVE-2025-21719.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-21719",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-12-29T08:45:45.753Z",
"datePublished": "2025-02-27T02:07:28.573Z",
"dateUpdated": "2026-10-15T21:51:52.573Z"
},
"containers": {
"cna": {
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"shortName": "Linux",
"dateUpdated": "2026-08-05T11:53:54.833Z"
},
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipmr: do not call mr_mfc_uses_dev() for unres entries\n\nsyzbot found that calling mr_mfc_uses_dev() for unres entries\nwould crash [1], because c->mfc_un.res.minvif / c->mfc_un.res.maxvif\nalias to \"struct sk_buff_head unresolved\", which contain two pointers.\n\nThis code never worked, lets remove it.\n\n[1]\nUnable to handle kernel paging request at virtual address ffff5fff2d536613\nKASAN: maybe wild-memory-access in range [0xfffefff96a9b3098-0xfffefff96a9b309f]\nModules linked in:\nCPU: 1 UID: 0 PID: 7321 Comm: syz.0.16 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\npstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline]\n pc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334\n lr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [inline]\n lr : mr_table_dump+0x694/0x8b0 net/ipv4/ipmr_base.c:334\nCall trace:\n mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline] (P)\n mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 (P)\n mr_rtm_dumproute+0x254/0x454 net/ipv4/ipmr_base.c:382\n ipmr_rtm_dumproute+0x248/0x4b4 net/ipv4/ipmr.c:2648\n rtnl_dump_all+0x2e4/0x4e8 net/core/rtnetlink.c:4327\n rtnl_dumpit+0x98/0x1d0 net/core/rtnetlink.c:6791\n netlink_dump+0x4f0/0xbc0 net/netlink/af_netlink.c:2317\n netlink_recvmsg+0x56c/0xe64 net/netlink/af_netlink.c:1973\n sock_recvmsg_nosec net/socket.c:1033 [inline]\n sock_recvmsg net/socket.c:1055 [inline]\n sock_read_iter+0x2d8/0x40c net/socket.c:1125\n new_sync_read fs/read_write.c:484 [inline]\n vfs_read+0x740/0x970 fs/read_write.c:565\n ksys_read+0x15c/0x26c fs/read_write.c:708"
}
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{
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"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"baseScore": 7.1,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable loop is reached only through an RTM_GETROUTE netlink dump (`rtnl_dump_all` → `ipmr_rtm_dumproute` → `mr_table_dump`) issued on a local AF_NETLINK socket. Although the unresolved cache entry itself is created by an incoming multicast packet, the crash requires the local netlink request, so the attack vector is Local.\nAC:L - The attacker fully controls both halves — creating unresolved MFC entries by sending multicast packets into a vif, and issuing the RTA_OIF-filtered strict-check dump — and can repeat this arbitrarily until an entry whose aliased pointer halves satisfy `minvif < maxvif` is walked. No condition outside the attacker's influence is required.\nPR:L - Netlink route dumps require no capability at all (rtnetlink only enforces CAP_NET_ADMIN for non-GET messages), and the multicast-routing setup that populates `mfc_unres_queue` is gated on CAP_NET_RAW/`ns_capable(net->user_ns, CAP_NET_ADMIN)`, both obtainable by any unprivileged user via `unshare -Urn`. On a host already running a multicast routing daemon, an unprivileged user needs only the dump.\nUI:N - The attacker performs every step itself — socket setup, multicast packet injection, and the netlink dump — with no action by any other user or administrator.\nS:U - The out-of-bounds access and its consequences are confined to the kernel's own memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The loop performs unbounded, wild out-of-bounds reads of kernel memory at indices derived from a heap pointer, spanning arbitrarily far outside `mrt->vif_table` and the mfc allocation, and the result feeds a userspace-observable dump-filtering decision that acts as an oracle on that out-of-bounds kernel memory.\nI:N - `mr_mfc_uses_dev()` is a purely read-only loop and `mr_fill_mroute()` returns early for unresolved entries, so no kernel memory is written or corrupted by this bug.\nA:H - The wild indexing causes a kernel paging fault / KASAN wild-memory-access oops, as reported by syzbot, and the near-billion-iteration loop runs while holding `mfc_unres_lock` with softirqs disabled, risking soft lockup and RCU stalls — a reliably reproducible kernel crash or hang."
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