CVE-2025-21719 (GCVE-0-2025-21719)
Vulnerability from cvelistv5
Published
2025-02-27 02:07
Modified
2026-10-15 21:51
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ipmr: do not call mr_mfc_uses_dev() for unres entries syzbot found that calling mr_mfc_uses_dev() for unres entries would crash [1], because c->mfc_un.res.minvif / c->mfc_un.res.maxvif alias to "struct sk_buff_head unresolved", which contain two pointers. This code never worked, lets remove it. [1] Unable to handle kernel paging request at virtual address ffff5fff2d536613 KASAN: maybe wild-memory-access in range [0xfffefff96a9b3098-0xfffefff96a9b309f] Modules linked in: CPU: 1 UID: 0 PID: 7321 Comm: syz.0.16 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline] pc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 lr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [inline] lr : mr_table_dump+0x694/0x8b0 net/ipv4/ipmr_base.c:334 Call trace: mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline] (P) mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 (P) mr_rtm_dumproute+0x254/0x454 net/ipv4/ipmr_base.c:382 ipmr_rtm_dumproute+0x248/0x4b4 net/ipv4/ipmr.c:2648 rtnl_dump_all+0x2e4/0x4e8 net/core/rtnetlink.c:4327 rtnl_dumpit+0x98/0x1d0 net/core/rtnetlink.c:6791 netlink_dump+0x4f0/0xbc0 net/netlink/af_netlink.c:2317 netlink_recvmsg+0x56c/0xe64 net/netlink/af_netlink.c:1973 sock_recvmsg_nosec net/socket.c:1033 [inline] sock_recvmsg net/socket.c:1055 [inline] sock_read_iter+0x2d8/0x40c net/socket.c:1125 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x740/0x970 fs/read_write.c:565 ksys_read+0x15c/0x26c fs/read_write.c:708
References
Impacted products
Vendor Product Version
Linux Linux Version: cb167893f41e21e6bd283d78e53489289dc0592d
Version: cb167893f41e21e6bd283d78e53489289dc0592d
Version: cb167893f41e21e6bd283d78e53489289dc0592d
Version: cb167893f41e21e6bd283d78e53489289dc0592d
Version: cb167893f41e21e6bd283d78e53489289dc0592d
Version: cb167893f41e21e6bd283d78e53489289dc0592d
Version: cb167893f41e21e6bd283d78e53489289dc0592d
Version: cb167893f41e21e6bd283d78e53489289dc0592d
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          "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-\u003emfc_un.res.minvif / c-\u003emfc_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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              "value": "AV:L - The vulnerable loop is reached only through an RTM_GETROUTE netlink dump (`rtnl_dump_all` \u2192 `ipmr_rtm_dumproute` \u2192 `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 \u2014 creating unresolved MFC entries by sending multicast packets into a vif, and issuing the RTA_OIF-filtered strict-check dump \u2014 and can repeat this arbitrarily until an entry whose aliased pointer halves satisfy `minvif \u003c maxvif` is walked. No condition outside the attacker\u0027s 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-\u003euser_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 \u2014 socket setup, multicast packet injection, and the netlink dump \u2014 with no action by any other user or administrator.\nS:U - The out-of-bounds access and its consequences are confined to the kernel\u0027s 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-\u003evif_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 \u2014 a reliably reproducible kernel crash or hang."
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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 \\u2014 creating unresolved MFC entries by sending multicast packets into a vif, and issuing the RTA_OIF-filtered strict-check dump \\u2014 and can repeat this arbitrarily until an entry whose aliased pointer halves satisfy `minvif \u003c maxvif` is walked. No condition outside the attacker\u0027s 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-\u003euser_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 \\u2014 socket setup, multicast packet injection, and the netlink dump \\u2014 with no action by any other user or administrator.\\nS:U - The out-of-bounds access and its consequences are confined to the kernel\u0027s 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-\u003evif_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 \\u2014 a reliably reproducible kernel crash or hang.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"cb167893f41e21e6bd283d78e53489289dc0592d\", \"lessThan\": \"71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cb167893f41e21e6bd283d78e53489289dc0592d\", \"lessThan\": \"53df27fd38f84bd3cd6b004eb4ff3c4903114f1d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cb167893f41e21e6bd283d78e53489289dc0592d\", \"lessThan\": \"547ef7e8cbb98f966c8719a3e15d4e078aaa9b47\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cb167893f41e21e6bd283d78e53489289dc0592d\", \"lessThan\": \"57177c5f47a8da852f8d76cf6945cf803f8bb9e5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cb167893f41e21e6bd283d78e53489289dc0592d\", \"lessThan\": \"b379b3162ff55a70464c6a934ae9bf0497478a62\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cb167893f41e21e6bd283d78e53489289dc0592d\", \"lessThan\": \"a099834a51ccf9bbba3de86a251b3433539abfde\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cb167893f41e21e6bd283d78e53489289dc0592d\", \"lessThan\": \"26bb7d991f04eeef47dfad23e533834995c26f7a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cb167893f41e21e6bd283d78e53489289dc0592d\", \"lessThan\": \"15a901361ec3fb1c393f91880e1cbf24ec0a88bd\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/ipmr_base.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.20\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.291\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.235\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.179\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.129\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.76\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/ipmr_base.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1\"}, {\"url\": \"https://git.kernel.org/stable/c/53df27fd38f84bd3cd6b004eb4ff3c4903114f1d\"}, {\"url\": \"https://git.kernel.org/stable/c/547ef7e8cbb98f966c8719a3e15d4e078aaa9b47\"}, {\"url\": \"https://git.kernel.org/stable/c/57177c5f47a8da852f8d76cf6945cf803f8bb9e5\"}, {\"url\": \"https://git.kernel.org/stable/c/b379b3162ff55a70464c6a934ae9bf0497478a62\"}, {\"url\": \"https://git.kernel.org/stable/c/a099834a51ccf9bbba3de86a251b3433539abfde\"}, {\"url\": \"https://git.kernel.org/stable/c/26bb7d991f04eeef47dfad23e533834995c26f7a\"}, {\"url\": \"https://git.kernel.org/stable/c/15a901361ec3fb1c393f91880e1cbf24ec0a88bd\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"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-\u003emfc_un.res.minvif / c-\u003emfc_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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.291\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.235\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.179\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.129\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.76\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.13\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.2\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"4.20\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:53:54.833Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21719\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:51:52.573Z\", \"dateReserved\": \"2024-12-29T08:45:45.753Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-27T02:07:28.573Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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