CVE-2021-47418

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47418", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:58:30.818Z", "datePublished": "2024-05-21T15:04:07.333Z", "dateUpdated": "2026-05-11T13:54:19.276Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:54:19.276Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: fix NULL deref in fifo_set_limit()\n\nsyzbot reported another NULL deref in fifo_set_limit() [1]\n\nI could repro the issue with :\n\nunshare -n\ntc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit\ntc qd replace dev lo parent 1:0 pfifo_fast\ntc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit\n\npfifo_fast does not have a change() operation.\nMake fifo_set_limit() more robust about this.\n\n[1]\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nPGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0\nOops: 0010 [#1] PREEMPT SMP KASAN\nCPU: 1 PID: 14443 Comm: syz-executor959 Not tainted 5.15.0-rc3-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:0x0\nCode: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\nRSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246\nRAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: ffff888024c27910 RDI: ffff888071e34000\nRBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947\nR10: 0000000000000001 R11: 0000000000000000 R12: ffff888024c27910\nR13: ffff888071e34018 R14: 0000000000000000 R15: ffff88801ef74800\nFS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n fifo_set_limit net/sched/sch_fifo.c:242 [inline]\n fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227\n tbf_change+0x6ec/0x16d0 net/sched/sch_tbf.c:418\n qdisc_change net/sched/sch_api.c:1332 [inline]\n tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634\n rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572\n netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\n netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]\n netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340\n netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929\n sock_sendmsg_nosec net/socket.c:704 [inline]\n sock_sendmsg+0xcf/0x120 net/socket.c:724\n ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409\n ___sys_sendmsg+0xf3/0x170 net/socket.c:2463\n __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_fifo.c"], "versions": [{"version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52", "status": "affected", "versionType": "git"}, {"version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4", "status": "affected", "versionType": "git"}, {"version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "26af64d71b6277841285fa40e3f7164a378dfda9", "status": "affected", "versionType": "git"}, {"version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "d07098f45be868a9cdce6c616563c36c64dbbd87", "status": "affected", "versionType": "git"}, {"version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "c951a3be5e8803e93bb49a0aca0d30457d3c1b67", "status": "affected", "versionType": "git"}, {"version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "acff2d182c0768a713cee77442caeb07668bd68f", "status": "affected", "versionType": "git"}, {"version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "fb58cd7991747b5e0b110c98c922d7b0e47a1f14", "status": "affected", "versionType": "git"}, {"version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc", "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/sched/sch_fifo.c"], "versions": [{"version": "2.6.27", "status": "affected"}, {"version": "0", "lessThan": "2.6.27", "status": "unaffected", "versionType": "semver"}, {"version": "4.4.289", "lessThanOrEqual": "4.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.9.287", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.251", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.211", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.153", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.73", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.12", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52"}, {"url": "https://git.kernel.org/stable/c/08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4"}, {"url": "https://git.kernel.org/stable/c/26af64d71b6277841285fa40e3f7164a378dfda9"}, {"url": "https://git.kernel.org/stable/c/d07098f45be868a9cdce6c616563c36c64dbbd87"}, {"url": "https://git.kernel.org/stable/c/c951a3be5e8803e93bb49a0aca0d30457d3c1b67"}, {"url": "https://git.kernel.org/stable/c/acff2d182c0768a713cee77442caeb07668bd68f"}, {"url": "https://git.kernel.org/stable/c/fb58cd7991747b5e0b110c98c922d7b0e47a1f14"}, {"url": "https://git.kernel.org/stable/c/560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc"}], "title": "net_sched: fix NULL deref in fifo_set_limit()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", 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{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/26af64d71b6277841285fa40e3f7164a378dfda9", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d07098f45be868a9cdce6c616563c36c64dbbd87", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c951a3be5e8803e93bb49a0aca0d30457d3c1b67", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/acff2d182c0768a713cee77442caeb07668bd68f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/fb58cd7991747b5e0b110c98c922d7b0e47a1f14", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.126Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47418", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:37:50.787552Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:13.682Z"}}], "cna": {"title": "net_sched: fix NULL deref in fifo_set_limit()", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52", "versionType": "git"}, {"status": "affected", "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4", "versionType": "git"}, {"status": "affected", "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "26af64d71b6277841285fa40e3f7164a378dfda9", "versionType": "git"}, {"status": "affected", "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "d07098f45be868a9cdce6c616563c36c64dbbd87", "versionType": "git"}, {"status": "affected", "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "c951a3be5e8803e93bb49a0aca0d30457d3c1b67", "versionType": "git"}, {"status": "affected", "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "acff2d182c0768a713cee77442caeb07668bd68f", "versionType": "git"}, {"status": "affected", "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "fb58cd7991747b5e0b110c98c922d7b0e47a1f14", "versionType": "git"}, {"status": "affected", "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "lessThan": "560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc", "versionType": "git"}], "programFiles": ["net/sched/sch_fifo.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.27"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.27", "versionType": "semver"}, {"status": "unaffected", "version": "4.4.289", "versionType": "semver", "lessThanOrEqual": "4.4.*"}, {"status": "unaffected", "version": "4.9.287", "versionType": "semver", "lessThanOrEqual": "4.9.*"}, {"status": "unaffected", "version": "4.14.251", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.211", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.153", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.73", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.14.12", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sched/sch_fifo.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52"}, {"url": "https://git.kernel.org/stable/c/08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4"}, {"url": "https://git.kernel.org/stable/c/26af64d71b6277841285fa40e3f7164a378dfda9"}, {"url": "https://git.kernel.org/stable/c/d07098f45be868a9cdce6c616563c36c64dbbd87"}, {"url": "https://git.kernel.org/stable/c/c951a3be5e8803e93bb49a0aca0d30457d3c1b67"}, {"url": "https://git.kernel.org/stable/c/acff2d182c0768a713cee77442caeb07668bd68f"}, {"url": "https://git.kernel.org/stable/c/fb58cd7991747b5e0b110c98c922d7b0e47a1f14"}, {"url": "https://git.kernel.org/stable/c/560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: fix NULL deref in fifo_set_limit()\n\nsyzbot reported another NULL deref in fifo_set_limit() [1]\n\nI could repro the issue with :\n\nunshare -n\ntc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit\ntc qd replace dev lo parent 1:0 pfifo_fast\ntc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit\n\npfifo_fast does not have a change() operation.\nMake fifo_set_limit() more robust about this.\n\n[1]\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nPGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0\nOops: 0010 [#1] PREEMPT SMP KASAN\nCPU: 1 PID: 14443 Comm: syz-executor959 Not tainted 5.15.0-rc3-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:0x0\nCode: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\nRSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246\nRAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: ffff888024c27910 RDI: ffff888071e34000\nRBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947\nR10: 0000000000000001 R11: 0000000000000000 R12: ffff888024c27910\nR13: ffff888071e34018 R14: 0000000000000000 R15: ffff88801ef74800\nFS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n fifo_set_limit net/sched/sch_fifo.c:242 [inline]\n fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227\n tbf_change+0x6ec/0x16d0 net/sched/sch_tbf.c:418\n qdisc_change net/sched/sch_api.c:1332 [inline]\n tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634\n rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572\n netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\n netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]\n netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340\n netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929\n sock_sendmsg_nosec net/socket.c:704 [inline]\n sock_sendmsg+0xcf/0x120 net/socket.c:724\n ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409\n ___sys_sendmsg+0xf3/0x170 net/socket.c:2463\n __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.4.289", "versionStartIncluding": "2.6.27"}, {"criteria": 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fix NULL deref in fifo_set_limit()\n\nsyzbot reported another NULL deref in fifo_set_limit() [1]\n\nI could repro the issue with :\n\nunshare -n\ntc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit\ntc qd replace dev lo parent 1:0 pfifo_fast\ntc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit\n\npfifo_fast does not have a change() operation.\nMake fifo_set_limit() more robust about this.\n\n[1]\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nPGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0\nOops: 0010 [#1] PREEMPT SMP KASAN\nCPU: 1 PID: 14443 Comm: syz-executor959 Not tainted 5.15.0-rc3-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:0x0\nCode: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\nRSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246\nRAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: ffff888024c27910 RDI: ffff888071e34000\nRBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947\nR10: 0000000000000001 R11: 0000000000000000 R12: ffff888024c27910\nR13: ffff888071e34018 R14: 0000000000000000 R15: ffff88801ef74800\nFS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n fifo_set_limit net/sched/sch_fifo.c:242 [inline]\n fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227\n tbf_change+0x6ec/0x16d0 net/sched/sch_tbf.c:418\n qdisc_change net/sched/sch_api.c:1332 [inline]\n tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634\n rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572\n netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\n netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]\n netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340\n netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929\n sock_sendmsg_nosec net/socket.c:704 [inline]\n sock_sendmsg+0xcf/0x120 net/socket.c:724\n ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409\n ___sys_sendmsg+0xf3/0x170 net/socket.c:2463\n __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net_sched: corrige el deref NULL en fifo_set_limit() syzbot inform\u00f3 otro deref NULL en fifo_set_limit() [1] Podr\u00eda reproducir el problema con: unshare -n tc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit tc qd reemplazar dev lo parent 1:0 pfifo_fast tc qd cambiar dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit pfifo_fast no tiene una operaci\u00f3n de cambio(). Haga que fifo_set_limit() sea m\u00e1s s\u00f3lido al respecto. [1] BUG: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000000 PGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0 Ups: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 14443 Comm: syz-executor959 No contaminado 5. 15.0-rc3- syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 C\u00f3digo: No se puede acceder a los bytes del c\u00f3digo de operaci\u00f3n en RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: c27910 RDI: ffff888071e34000 RBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947 R10: 00000000000000001 R11: 0000000000000000 R12 : ffff888024c27910 R13: ffff888071e34018 R14: 00000000000000000 R15: ffff88801ef74800 FS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:00000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 50033 CR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 00000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas: fifo_set_limit net/sched/sch_fifo.c:242 [en l\u00ednea] fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227 6ec/0x16d0 net/sched/sch_tbf.c: 418 qdisc_change net/sched/sch_api.c:1332 [en l\u00ednea] tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x153/0x42 0 red/enlace de red /af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [en l\u00ednea] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/ socket.c:704 [en l\u00ednea] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0 x1b0 neto /socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [en l\u00ednea] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 Entry_SYSCALL_64_after_hwframe+0x44/0xae"}], "id": "CVE-2021-47418", "lastModified": "2026-06-17T04:17:25.597", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47418", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:37:50.787552Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:27.257", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": 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{"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/26af64d71b6277841285fa40e3f7164a378dfda9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/acff2d182c0768a713cee77442caeb07668bd68f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c951a3be5e8803e93bb49a0aca0d30457d3c1b67"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d07098f45be868a9cdce6c616563c36c64dbbd87"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb58cd7991747b5e0b110c98c922d7b0e47a1f14"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net_sched: fix NULL deref in fifo_set_limit()", "id": "2282316", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282316"}, "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"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet_sched: fix NULL deref in fifo_set_limit()\nsyzbot reported another NULL deref in fifo_set_limit() [1]\nI could repro the issue with :\nunshare -n\ntc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit\ntc qd replace dev lo parent 1:0 pfifo_fast\ntc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit\npfifo_fast does not have a change() operation.\nMake fifo_set_limit() more robust about this.\n[1]\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nPGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0\nOops: 0010 [#1] PREEMPT SMP KASAN\nCPU: 1 PID: 14443 Comm: syz-executor959 Not tainted 5.15.0-rc3-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:0x0\nCode: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\nRSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246\nRAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: ffff888024c27910 RDI: ffff888071e34000\nRBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947\nR10: 0000000000000001 R11: 0000000000000000 R12: ffff888024c27910\nR13: ffff888071e34018 R14: 0000000000000000 R15: ffff88801ef74800\nFS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\nfifo_set_limit net/sched/sch_fifo.c:242 [inline]\nfifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227\ntbf_change+0x6ec/0x16d0 net/sched/sch_tbf.c:418\nqdisc_change net/sched/sch_api.c:1332 [inline]\ntc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634\nrtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572\nnetlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\nnetlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]\nnetlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340\nnetlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929\nsock_sendmsg_nosec net/socket.c:704 [inline]\nsock_sendmsg+0xcf/0x120 net/socket.c:724\n____sys_sendmsg+0x6e8/0x810 net/socket.c:2409\n___sys_sendmsg+0xf3/0x170 net/socket.c:2463\n__sys_sendmsg+0xe5/0x1b0 net/socket.c:2492\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x44/0xae"], "name": "CVE-2021-47418", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47418\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47418\nhttps://lore.kernel.org/linux-cve-announce/2024052154-CVE-2021-47418-342e@gregkh/T"], "threat_severity": "Low"}

{}