{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2021-47418", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47418", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2024-05-21T15:04:07.333Z", "updatedAt": "2026-05-11T13:54:19.276Z", "importedAt": "2026-10-24T01:56:36.661Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net_sched: fix NULL deref in fifo_set_limit()", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "status": "affected", "versionType": "git", "lessThan": "0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52" }, { "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "status": "affected", "versionType": "git", "lessThan": "08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4" }, { "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "status": "affected", "versionType": "git", "lessThan": "26af64d71b6277841285fa40e3f7164a378dfda9" }, { "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "status": "affected", "versionType": "git", "lessThan": "d07098f45be868a9cdce6c616563c36c64dbbd87" }, { "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "status": "affected", "versionType": "git", "lessThan": "c951a3be5e8803e93bb49a0aca0d30457d3c1b67" }, { "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "status": "affected", "versionType": "git", "lessThan": "acff2d182c0768a713cee77442caeb07668bd68f" }, { "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "status": "affected", "versionType": "git", "lessThan": "fb58cd7991747b5e0b110c98c922d7b0e47a1f14" }, { "version": "fb0305ce1b03f6ff17f84f2c63daccecb45f2805", "status": "affected", "versionType": "git", "lessThan": "560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.27", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.27" }, { "version": "4.4.289", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.4.*" }, { "version": "4.9.287", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.251", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.211", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.153", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.73", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.14.12", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.14.*" }, { "version": "5.15", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }