{"id":"CVE-2024-39487","state":"PUBLISHED","title":"bonding: Fix out-of-bounds read in bond_option_arp_ip_targets_set()","description":"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.","publishedAt":"2024-07-09T09:52:07.664Z","updatedAt":"2026-10-15T00:44:24.096Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"6a8a4fd082c439e19fede027e80c79bc4c84bb8e","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"6b21346b399fd1336fe59233a17eb5ce73041ee1","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"707c85ba3527ad6aa25552033576b0f1ff835d7b","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"bfd14e5915c2669f292a31d028e75dcd82f1e7e9","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"c8eb8ab9a44ff0e73492d0a12a643c449f641a9f","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"b75e33eae8667084bd4a63e67657c6a5a0f8d1e8","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"9f835e48bd4c75fdf6a9cff3f0b806a7abde78da","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"e271ff53807e8f2c628758290f0e499dbe51cb3d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_options.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"4.19.318","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.280","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.222","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.163","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.98","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.39","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.9.9","status":"unaffected","lessThanOrEqual":"6.9.*","versionType":"semver"},{"version":"6.10","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_options.c"]}],"references":["https://git.kernel.org/stable/c/6a8a4fd082c439e19fede027e80c79bc4c84bb8e","https://git.kernel.org/stable/c/6b21346b399fd1336fe59233a17eb5ce73041ee1","https://git.kernel.org/stable/c/707c85ba3527ad6aa25552033576b0f1ff835d7b","https://git.kernel.org/stable/c/bfd14e5915c2669f292a31d028e75dcd82f1e7e9","https://git.kernel.org/stable/c/c8eb8ab9a44ff0e73492d0a12a643c449f641a9f","https://git.kernel.org/stable/c/b75e33eae8667084bd4a63e67657c6a5a0f8d1e8","https://git.kernel.org/stable/c/9f835e48bd4c75fdf6a9cff3f0b806a7abde78da","https://git.kernel.org/stable/c/e271ff53807e8f2c628758290f0e499dbe51cb3d","https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html","https://cert-portal.siemens.com/productcert/html/ssa-398330.html","https://cert-portal.siemens.com/productcert/html/ssa-613116.html","https://cert-portal.siemens.com/productcert/html/ssa-355557.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:39.287Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/39xxx/CVE-2024-39487.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-39487","state":"PUBLISHED","datePublished":"2024-07-09T09:52:07.664Z","dateUpdated":"2026-10-15T00:44:24.096Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-06-25T14:23:23.747Z"},"containers":{"cna":{"title":"bonding: Fix out-of-bounds read in bond_option_arp_ip_targets_set()","descriptions":[{"lang":"en","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"6a8a4fd082c439e19fede027e80c79bc4c84bb8e","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"6b21346b399fd1336fe59233a17eb5ce73041ee1","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"707c85ba3527ad6aa25552033576b0f1ff835d7b","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"bfd14e5915c2669f292a31d028e75dcd82f1e7e9","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"c8eb8ab9a44ff0e73492d0a12a643c449f641a9f","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"b75e33eae8667084bd4a63e67657c6a5a0f8d1e8","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"9f835e48bd4c75fdf6a9cff3f0b806a7abde78da","versionType":"git"},{"version":"f9de11a165943a55e0fbda714caf60eaeb276a42","status":"affected","lessThan":"e271ff53807e8f2c628758290f0e499dbe51cb3d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_options.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"4.19.318","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.280","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.222","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.163","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.98","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.39","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.9.9","status":"unaffected","lessThanOrEqual":"6.9.*","versionType":"semver"},{"version":"6.10","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_options.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6a8a4fd082c439e19fede027e80c79bc4c84bb8e"},{"url":"https://git.kernel.org/stable/c/6b21346b399fd1336fe59233a17eb5ce73041ee1"},{"url":"https://git.kernel.org/stable/c/707c85ba3527ad6aa25552033576b0f1ff835d7b"},{"url":"https://git.kernel.org/stable/c/bfd14e5915c2669f292a31d028e75dcd82f1e7e9"},{"url":"https://git.kernel.org/stable/c/c8eb8ab9a44ff0e73492d0a12a643c449f641a9f"},{"url":"https://git.kernel.org/stable/c/b75e33eae8667084bd4a63e67657c6a5a0f8d1e8"},{"url":"https://git.kernel.org/stable/c/9f835e48bd4c75fdf6a9cff3f0b806a7abde78da"},{"url":"https://git.kernel.org/stable/c/e271ff53807e8f2c628758290f0e499dbe51cb3d"}],"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 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 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