Linux: Out-of-bounds Read
CVE-2024-39487 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 6a8a4fd082c439e19fede027e80c79bc4c84bb8e, 6b21346b399fd1336fe59233a17eb5ce73041ee1, 707c85ba3527ad6aa25552033576b0f1ff835d7b as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.25% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 6a8a4fd082c439e19fede027e80c79bc4c84bb8e or 6b21346b399fd1336fe59233a17eb5ce73041ee1 or 707c85ba3527ad6aa25552033576b0f1ff835d7b or bfd14e5915c2669f292a31d028e75dcd82f1e7e9, whichever matches your release line, or a later version.
- Update RUGGEDCOM RST2428P to V3.1 or a later version.
- Update SCALANCE XCM-/XRM-/XCH-/XRH-300 family to V3.1 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | f9de11a165943a55e0fbda714caf60eaeb276a42 up to, but not including, 6a8a4fd082c439e19fede027e80c79bc4c84bb8e; f9de11a165943a55e0fbda714caf60eaeb276a42 up to, but not including, 6b21346b399fd1336fe59233a17eb5ce73041ee1; f9de11a165943a55e0fbda714caf60eaeb276a42 up to, but not including, 707c85ba3527ad6aa25552033576b0f1ff835d7b; f9de11a165943a55e0fbda714caf60eaeb276a42 up to, but not including, bfd14e5915c2669f292a31d028e75dcd82f1e7e9; f9de11a165943a55e0fbda714caf60eaeb276a42 up to, but not including, c8eb8ab9a44ff0e73492d0a12a643c449f641a9f; f9de11a165943a55e0fbda714caf60eaeb276a42 up to, but not including, b75e33eae8667084bd4a63e67657c6a5a0f8d1e8; f9de11a165943a55e0fbda714caf60eaeb276a42 up to, but not including, 9f835e48bd4c75fdf6a9cff3f0b806a7abde78da; f9de11a165943a55e0fbda714caf60eaeb276a42 up to, but not including, e271ff53807e8f2c628758290f0e499dbe51cb3d; and 1 more ranges | 6a8a4fd082c439e19fede027e80c79bc4c84bb8e, 6b21346b399fd1336fe59233a17eb5ce73041ee1, 707c85ba3527ad6aa25552033576b0f1ff835d7b, bfd14e5915c2669f292a31d028e75dcd82f1e7e9, c8eb8ab9a44ff0e73492d0a12a643c449f641a9f, b75e33eae8667084bd4a63e67657c6a5a0f8d1e8 |
| Siemens | RUGGEDCOM RST2428P | before V3.1 | V3.1 |
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family | Not specified in the record | Not stated |
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family | before V3.1 | V3.1 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | V3.1.0 up to, but not including, V3.1.5 | V3.1.5 |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | V3.1.0 up to, but not including, V3.1.5 | V3.1.5 |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | V3.1.0 up to, but not including, V3.1.5 | V3.1.5 |
| Linux | Linux Kernel | 3.13 up to, but not including, 4.19.318; 4.20 up to, but not including, 5.4.280; 5.5 up to, but not including, 5.10.222; 5.11 up to, but not including, 5.15.163; 5.16 up to, but not including, 6.1.98; 6.2 up to, but not including, 6.6.39; 6.7 up to, but not including, 6.9.9; 6.10 | 4.19.318, 5.4.280, 5.10.222, 5.15.163, 6.1.98, 6.6.39 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.1 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: bonding: Fix out-of-bounds read in bond_option_arp_ip_targets_set() In function bond_option_arp_ip_targets_set(), if newval->string is an empty string, newval->string+1 will point to the byte after the string, causing an out-of-bound read. BUG: KASAN: slab-out-of-bounds in strlen+0x7d/0xa0 lib/string.c:418 Read of size 1 at addr ffff8881119c4781 by task syz-executor665/8107 CPU: 1 PID: 8107 Comm: syz-executor665 Not tainted 6.7.0-rc7 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc1/0x5e0 mm/kasan/report.c:475 kasan_report+0xbe/0xf0 mm/kasan/report.c:588 strlen+0x7d/0xa0 lib/string.c:418 __fortify_strlen include/linux/fortify-string.h:210 [inline] in4_pton+0xa3/0x3f0 net/core/utils.c:130 bond_option_arp_ip_targets_set+0xc2/0x910 drivers/net/bonding/bond_options.c:1201 __bond_opt_set+0x2a4/0x1030 drivers/net/bonding/bond_options.c:767 __bond_opt_set_notify+0x48/0x150 drivers/net/bonding/bond_options.c:792 bond_opt_tryset_rtnl+0xda/0x160 drivers/net/bonding/bond_options.c:817 bonding_sysfs_store_option+0xa1/0x120 drivers/net/bonding/bond_sysfs.c:156 dev_attr_store+0x54/0x80 drivers/base/core.c:2366 sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x96a/0xd80 fs/read_write.c:584 ksys_write+0x122/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b ---[ end trace ]--- Fix it by adding a check of string length before using it.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/6a8a4fd082c439e19fede027e80c79bc4c84bb8eMailing List
- git.kernel.org/stable/c/6b21346b399fd1336fe59233a17eb5ce73041ee1Mailing List
- git.kernel.org/stable/c/707c85ba3527ad6aa25552033576b0f1ff835d7bMailing List
- git.kernel.org/stable/c/9f835e48bd4c75fdf6a9cff3f0b806a7abde78daMailing List
- git.kernel.org/stable/c/b75e33eae8667084bd4a63e67657c6a5a0f8d1e8Mailing List
- git.kernel.org/stable/c/bfd14e5915c2669f292a31d028e75dcd82f1e7e9Mailing List
- git.kernel.org/stable/c/c8eb8ab9a44ff0e73492d0a12a643c449f641a9fMailing List
- git.kernel.org/stable/c/e271ff53807e8f2c628758290f0e499dbe51cb3dMailing List
Other references
Recent Out-of-bounds Read vulnerabilities
- 8.8 High severity
- 8.4 High severity
- 8.2 High severity
- 7.8 High severity
- 7.8 High severity
- 8.2 High severity
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