{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26815", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.180Z", "datePublished": "2024-04-10T11:07:03.182Z", "dateUpdated": "2026-08-05T11:27:36.126Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:36.126Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: taprio: proper TCA_TAPRIO_TC_ENTRY_INDEX check\n\ntaprio_parse_tc_entry() is not correctly checking\nTCA_TAPRIO_TC_ENTRY_INDEX attribute:\n\n\tint tc; // Signed value\n\n\ttc = nla_get_u32(tb[TCA_TAPRIO_TC_ENTRY_INDEX]);\n\tif (tc >= TC_QOPT_MAX_QUEUE) {\n\t\tNL_SET_ERR_MSG_MOD(extack, \"TC entry index out of range\");\n\t\treturn -ERANGE;\n\t}\n\nsyzbot reported that it could fed arbitary negative values:\n\nUBSAN: shift-out-of-bounds in net/sched/sch_taprio.c:1722:18\nshift exponent -2147418108 is negative\nCPU: 0 PID: 5066 Comm: syz-executor367 Not tainted 6.8.0-rc7-syzkaller-00136-gc8a5c731fd12 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024\nCall Trace:\n \n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106\n ubsan_epilogue lib/ubsan.c:217 [inline]\n __ubsan_handle_shift_out_of_bounds+0x3c7/0x420 lib/ubsan.c:386\n taprio_parse_tc_entry net/sched/sch_taprio.c:1722 [inline]\n taprio_parse_tc_entries net/sched/sch_taprio.c:1768 [inline]\n taprio_change+0xb87/0x57d0 net/sched/sch_taprio.c:1877\n taprio_init+0x9da/0xc80 net/sched/sch_taprio.c:2134\n qdisc_create+0x9d4/0x1190 net/sched/sch_api.c:1355\n tc_modify_qdisc+0xa26/0x1e40 net/sched/sch_api.c:1776\n rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6617\n netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543\n netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\n netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367\n netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:745\n ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584\n ___sys_sendmsg net/socket.c:2638 [inline]\n __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667\n do_syscall_64+0xf9/0x240\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\nRIP: 0033:0x7f1b2dea3759\nCode: 48 83 c4 28 c3 e8 d7 19 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007ffd4de452f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 00007f1b2def0390 RCX: 00007f1b2dea3759\nRDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004\nRBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000\nR10: 0000555500000000 R11: 0000000000000246 R12: 00007ffd4de45340\nR13: 00007ffd4de45310 R14: 0000000000000001 R15: 00007ffd4de45340" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached through an RTM_NEWQDISC message on an AF_NETLINK/NETLINK_ROUTE socket, i.e. a local syscall (sendmsg) on the local system. No remote or adjacent network input reaches taprio's qdisc configuration path.\nAC:L - The attacker fully controls both the out-of-bounds index (any value with bit 31 set) and the written value (0..dev->max_mtu), with no race, timing window, or uncontrollable memory-layout precondition; the malformed netlink message triggers the write deterministically on every attempt.\nPR:L - The only gate is netlink_net_capable(skb, CAP_NET_ADMIN), which is evaluated against the netns's user_ns, so an unprivileged user obtains it via `unshare -Urn` and then creates the required multi-queue device inside that namespace.\nUI:N - The attacker triggers the entire sequence from their own process via unshare/netlink; no action by any other user or administrator is needed.\nS:U - The out-of-bounds write corrupts kernel memory within the same kernel security authority; there is no VM, IOMMU, or hypervisor boundary crossed.\nC:H - The attacker-controlled out-of-bounds write into and below the kernel stack frame is memory corruption that can be leveraged to overwrite pointers, length fields, or return state and thereby disclose arbitrary kernel memory.\nI:H - This is a direct out-of-bounds write with attacker-chosen offset (down to -8 GiB from the stack array, 4-byte granularity) and attacker-chosen value up to 65535, which can smash the callee's saved return address and canary — a control-flow-hijack-capable primitive.\nA:H - Even without exploitation, the negative-index write corrupts the kernel stack or touches unmapped vmalloc memory, producing a stack-protector panic, KASAN report, or oops, and the UBSAN shift-out-of-bounds path is hit unconditionally." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/sch_taprio.c" ], "versions": [ { "version": "a54fc09e4cba3004443aa05979f8c678196c8226", "lessThan": "bd2474a45df7c11412c2587de3d4e43760531418", "status": "affected", "versionType": "git" }, { "version": "a54fc09e4cba3004443aa05979f8c678196c8226", "lessThan": "6915b1b28fe57e92c78e664366dc61c4f15ff03b", "status": "affected", "versionType": "git" }, { "version": "a54fc09e4cba3004443aa05979f8c678196c8226", "lessThan": "860e838fb089d652a446ced52cbdf051285b68e7", "status": "affected", "versionType": "git" }, { "version": "a54fc09e4cba3004443aa05979f8c678196c8226", "lessThan": "9b720bb1a69a9f12a4a5c86b6f89386fe05ed0f2", "status": "affected", "versionType": "git" }, { "version": "a54fc09e4cba3004443aa05979f8c678196c8226", "lessThan": "343041b59b7810f9cdca371f445dd43b35c740b1", "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_taprio.c" ], "versions": [ { "version": "6.1", "status": "affected" }, { "version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.83", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.23", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.11", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.2", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "6.1", "versionEndExcluding": "6.1.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.7.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.8.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/bd2474a45df7c11412c2587de3d4e43760531418" }, { "url": "https://git.kernel.org/stable/c/6915b1b28fe57e92c78e664366dc61c4f15ff03b" }, { "url": "https://git.kernel.org/stable/c/860e838fb089d652a446ced52cbdf051285b68e7" }, { "url": "https://git.kernel.org/stable/c/9b720bb1a69a9f12a4a5c86b6f89386fe05ed0f2" }, { "url": "https://git.kernel.org/stable/c/343041b59b7810f9cdca371f445dd43b35c740b1" } ], "title": "net/sched: taprio: proper TCA_TAPRIO_TC_ENTRY_INDEX check", "x_generator": { "engine": "bippy-1.2.0" } }, 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"version": "2.0.3", "timestamp": "2024-09-10T15:50:23.957243Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:41.649Z" } } ] } }