CVE-2025-21719

{"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": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:53:54.833Z"}, "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->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"}], "metrics": [{"cvssV3_1": {"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` \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 < 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 \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'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 \u2014 a reliably reproducible kernel crash or hang."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/ipmr_base.c"], "versions": [{"version": "cb167893f41e21e6bd283d78e53489289dc0592d", "lessThan": "71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1", "status": "affected", "versionType": "git"}, {"version": "cb167893f41e21e6bd283d78e53489289dc0592d", "lessThan": "53df27fd38f84bd3cd6b004eb4ff3c4903114f1d", "status": "affected", "versionType": "git"}, {"version": "cb167893f41e21e6bd283d78e53489289dc0592d", "lessThan": "547ef7e8cbb98f966c8719a3e15d4e078aaa9b47", "status": "affected", "versionType": "git"}, {"version": "cb167893f41e21e6bd283d78e53489289dc0592d", "lessThan": "57177c5f47a8da852f8d76cf6945cf803f8bb9e5", "status": "affected", "versionType": "git"}, {"version": "cb167893f41e21e6bd283d78e53489289dc0592d", "lessThan": "b379b3162ff55a70464c6a934ae9bf0497478a62", "status": "affected", "versionType": "git"}, {"version": "cb167893f41e21e6bd283d78e53489289dc0592d", "lessThan": "a099834a51ccf9bbba3de86a251b3433539abfde", "status": "affected", "versionType": "git"}, {"version": "cb167893f41e21e6bd283d78e53489289dc0592d", "lessThan": "26bb7d991f04eeef47dfad23e533834995c26f7a", "status": "affected", "versionType": "git"}, {"version": "cb167893f41e21e6bd283d78e53489289dc0592d", "lessThan": "15a901361ec3fb1c393f91880e1cbf24ec0a88bd", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/ipmr_base.c"], "versions": [{"version": "4.20", "status": "affected"}, {"version": "0", "lessThan": "4.20", 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"6.13.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.14"}]}]}], "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"}], "title": "ipmr: do not call mr_mfc_uses_dev() for unres entries", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program 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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 < 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 \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'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 \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", 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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"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/ipmr_base.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1", "status": "affected", "version": "cb167893f41e21e6bd283d78e53489289dc0592d", "versionType": "git"}, {"lessThan": "53df27fd38f84bd3cd6b004eb4ff3c4903114f1d", "status": "affected", "version": "cb167893f41e21e6bd283d78e53489289dc0592d", "versionType": "git"}, {"lessThan": "547ef7e8cbb98f966c8719a3e15d4e078aaa9b47", "status": "affected", "version": "cb167893f41e21e6bd283d78e53489289dc0592d", "versionType": "git"}, {"lessThan": "57177c5f47a8da852f8d76cf6945cf803f8bb9e5", "status": "affected", "version": "cb167893f41e21e6bd283d78e53489289dc0592d", "versionType": "git"}, {"lessThan": "b379b3162ff55a70464c6a934ae9bf0497478a62", "status": "affected", "version": "cb167893f41e21e6bd283d78e53489289dc0592d", "versionType": "git"}, {"lessThan": "a099834a51ccf9bbba3de86a251b3433539abfde", "status": "affected", "version": "cb167893f41e21e6bd283d78e53489289dc0592d", "versionType": "git"}, {"lessThan": "26bb7d991f04eeef47dfad23e533834995c26f7a", "status": "affected", "version": "cb167893f41e21e6bd283d78e53489289dc0592d", "versionType": "git"}, {"lessThan": "15a901361ec3fb1c393f91880e1cbf24ec0a88bd", "status": "affected", "version": "cb167893f41e21e6bd283d78e53489289dc0592d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/ipmr_base.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.20"}, {"lessThan": "4.20", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.291", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.235", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.179", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.129", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.76", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.13", "versionType": "semver"}, {"lessThanOrEqual": "6.13.*", "status": "unaffected", "version": "6.13.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"defaultStatus": "unknown", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0621B0C8-6B2C-4585-A573-E22908F29576", "versionEndExcluding": "5.4.291", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "545121FA-DE31-4154-9446-C2000FB4104D", "versionEndExcluding": "5.10.235", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C708062C-4E1B-465F-AE6D-C09C46400875", "versionEndExcluding": "5.15.179", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2DA5009C-C9B9-4A1D-9B96-78427E8F232C", "versionEndExcluding": "6.1.129", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A6D70701-9CB6-4222-A957-00A419878993", "versionEndExcluding": "6.6.76", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2897389C-A8C3-4D69-90F2-E701B3D66373", "versionEndExcluding": "6.12.13", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6D4116B1-1BFD-4F23-BA84-169CC05FC5A3", "versionEndExcluding": "6.13.2", "versionStartIncluding": "6.13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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->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"}, {"lang": "es", "value": "En el n\u00facleo de Linux, se ha resuelto la siguiente vulnerabilidad: ipmr: no llamar a mr_mfc_uses_dev() para entradas no resueltas syzbot descubri\u00f3 que llamar a mr_mfc_uses_dev() para entradas no resueltas provocar\u00eda un bloqueo [1], porque c-&gt;mfc_un.res.minvif / c-&gt;mfc_un.res.maxvif son alias de \"struct sk_buff_head unresolved\", que contienen dos punteros. Este c\u00f3digo nunca funcion\u00f3, elimin\u00e9moslo. [1] No se puede manejar la solicitud de paginaci\u00f3n del kernel en la direcci\u00f3n virtual ffff5fff2d536613 KASAN: tal vez un acceso a memoria salvaje en el rango [0xfffefff96a9b3098-0xfffefff96a9b309f] M\u00f3dulos vinculados: CPU: 1 UID: 0 PID: 7321 Comm: syz.0.16 No contaminado 6.13.0-rc7-syzkaller-g1950a0af2d55 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 13/09/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [en l\u00ednea] pc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 lr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [en l\u00ednea] lr : mr_table_dump+0x694/0x8b0 net/ipv4/ipmr_base.c:334 Rastreo de llamadas: mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [en l\u00ednea] (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 [en l\u00ednea] sock_recvmsg net/socket.c:1055 [en l\u00ednea] sock_read_iter+0x2d8/0x40c net/socket.c:1125 new_sync_read fs/read_write.c:484 [en l\u00ednea] vfs_read+0x740/0x970 fs/read_write.c:565 ksys_read+0x15c/0x26c fs/read_write.c:708"}], "id": "CVE-2025-21719", "lastModified": "2026-10-15T22:18:08.073", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-21719", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:42:48.262327Z", "version": "2.0.3"}}]}, "published": "2025-02-27T02:15:15.580", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/15a901361ec3fb1c393f91880e1cbf24ec0a88bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/26bb7d991f04eeef47dfad23e533834995c26f7a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53df27fd38f84bd3cd6b004eb4ff3c4903114f1d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/547ef7e8cbb98f966c8719a3e15d4e078aaa9b47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/57177c5f47a8da852f8d76cf6945cf803f8bb9e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a099834a51ccf9bbba3de86a251b3433539abfde"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b379b3162ff55a70464c6a934ae9bf0497478a62"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipmr: do not call mr_mfc_uses_dev() for unres entries", "id": "2348570", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348570"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipmr: do not call mr_mfc_uses_dev() for unres entries\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.\nThis code never worked, lets remove it.\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=--)\npc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline]\npc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334\nlr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [inline]\nlr : mr_table_dump+0x694/0x8b0 net/ipv4/ipmr_base.c:334\nCall trace:\nmr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline] (P)\nmr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 (P)\nmr_rtm_dumproute+0x254/0x454 net/ipv4/ipmr_base.c:382\nipmr_rtm_dumproute+0x248/0x4b4 net/ipv4/ipmr.c:2648\nrtnl_dump_all+0x2e4/0x4e8 net/core/rtnetlink.c:4327\nrtnl_dumpit+0x98/0x1d0 net/core/rtnetlink.c:6791\nnetlink_dump+0x4f0/0xbc0 net/netlink/af_netlink.c:2317\nnetlink_recvmsg+0x56c/0xe64 net/netlink/af_netlink.c:1973\nsock_recvmsg_nosec net/socket.c:1033 [inline]\nsock_recvmsg net/socket.c:1055 [inline]\nsock_read_iter+0x2d8/0x40c net/socket.c:1125\nnew_sync_read fs/read_write.c:484 [inline]\nvfs_read+0x740/0x970 fs/read_write.c:565\nksys_read+0x15c/0x26c fs/read_write.c:708"], "name": "CVE-2025-21719", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21719\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21719\nhttps://lore.kernel.org/linux-cve-announce/2025022646-CVE-2025-21719-dbee@gregkh/T"], "threat_severity": "Low"}

{}