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vuln-cve/data/2024/39xxx/CVE-2024-39487.json
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{
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"dataVersion": "5.2",
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"cveId": "CVE-2024-39487",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-06-25T14:23:23.747Z",
"datePublished": "2024-07-09T09:52:07.664Z",
"dateUpdated": "2026-10-15T00:44:24.096Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: Fix out-of-bounds read in bond_option_arp_ip_targets_set()\n\nIn function bond_option_arp_ip_targets_set(), if newval->string is an\nempty string, newval->string+1 will point to the byte after the\nstring, causing an out-of-bound read.\n\nBUG: KASAN: slab-out-of-bounds in strlen+0x7d/0xa0 lib/string.c:418\nRead of size 1 at addr ffff8881119c4781 by task syz-executor665/8107\nCPU: 1 PID: 8107 Comm: syz-executor665 Not tainted 6.7.0-rc7 #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:364 [inline]\n print_report+0xc1/0x5e0 mm/kasan/report.c:475\n kasan_report+0xbe/0xf0 mm/kasan/report.c:588\n strlen+0x7d/0xa0 lib/string.c:418\n __fortify_strlen include/linux/fortify-string.h:210 [inline]\n in4_pton+0xa3/0x3f0 net/core/utils.c:130\n bond_option_arp_ip_targets_set+0xc2/0x910\ndrivers/net/bonding/bond_options.c:1201\n __bond_opt_set+0x2a4/0x1030 drivers/net/bonding/bond_options.c:767\n __bond_opt_set_notify+0x48/0x150 drivers/net/bonding/bond_options.c:792\n bond_opt_tryset_rtnl+0xda/0x160 drivers/net/bonding/bond_options.c:817\n bonding_sysfs_store_option+0xa1/0x120 drivers/net/bonding/bond_sysfs.c:156\n dev_attr_store+0x54/0x80 drivers/base/core.c:2366\n sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136\n kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334\n call_write_iter include/linux/fs.h:2020 [inline]\n new_sync_write fs/read_write.c:491 [inline]\n vfs_write+0x96a/0xd80 fs/read_write.c:584\n ksys_write+0x122/0x250 fs/read_write.c:637\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n---[ end trace ]---\n\nFix it by adding a check of string length before using it."
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"value": "AV:L - The only path that reaches the string branch is a write(2) to /sys/class/net/<bond>/bonding/arp_ip_target; the rtnetlink path passes a binary __be32 and cannot set newval->string. This requires local access, not network traffic.\nAC:L - A single deterministic write of one NUL byte produces the empty string and triggers the out-of-bounds strlen() every time — no race, no timing window, and no dependence on memory layout to reach the OOB access.\nPR:L - Verified empirically as uid 1000: inside `unshare -Urnm` the bond netdev's sysfs group is owned by the user namespace's root (net_class.get_ownership → net_ns_get_ownership), which maps to the attacker's real uid, so an unprivileged user can create the bond and write the attribute. No real root or init-namespace capability is needed.\nUI:N - The attacker performs the entire sequence (create netns/userns, create bond device, write the sysfs file) unaided; no victim action is involved.\nS:U - The out-of-bounds read stays within the kernel's own memory and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - strlen() walks adjacent slab memory with no upper bound until it happens to find a NUL byte, and parsed heap bytes forming a dotted quad are stored in bond->params.arp_targets where any user can read them back via the world-readable arp_ip_target attribute or netlink; the pre-fix error path also leaked uninitialized kernel stack through %pI4.\nI:N - The defect is a read-only out-of-bounds access with no write primitive; the only state changed is the bond's own ARP target list, which the same actor could already set legitimately through the identical interface.\nA:H - The unbounded read can run past the end of the slab page into unmapped memory (e.g. with DEBUG_PAGEALLOC/page poisoning) causing an oops, and on KASAN kernels it produces the reported slab-out-of-bounds report/panic, repeatable at will by an unprivileged user."
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