Linux: Out-of-bounds Read
CVE-2024-38599 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 2904e1d9b64f72d291095e3cbb31634f08788b11, 526235dffcac74c7823ed504dfac4f88d84ba5df, f0eea095ce8c959b86e1e57fe36ca4fea5ae54f8 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 0.24% 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 2904e1d9b64f72d291095e3cbb31634f08788b11 or 526235dffcac74c7823ed504dfac4f88d84ba5df or f0eea095ce8c959b86e1e57fe36ca4fea5ae54f8 or a1d21bcd78cf4a4353e1e835789429c6b76aca8b, whichever matches your release line, or a later version.
- Update SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to V1.1.1 or a later version.
- Update Linux Kernel to 4.19.316 or 5.4.278 or 5.10.219 or 5.15.161, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | aa98d7cf59b5b0764d3502662053489585faf2fe up to, but not including, 2904e1d9b64f72d291095e3cbb31634f08788b11; aa98d7cf59b5b0764d3502662053489585faf2fe up to, but not including, 526235dffcac74c7823ed504dfac4f88d84ba5df; aa98d7cf59b5b0764d3502662053489585faf2fe up to, but not including, f0eea095ce8c959b86e1e57fe36ca4fea5ae54f8; aa98d7cf59b5b0764d3502662053489585faf2fe up to, but not including, a1d21bcd78cf4a4353e1e835789429c6b76aca8b; aa98d7cf59b5b0764d3502662053489585faf2fe up to, but not including, f06969df2e40ab1dc8f4364a5de967830c74a098; aa98d7cf59b5b0764d3502662053489585faf2fe up to, but not including, af82d8d2179b7277ad627c39e7e0778f1c86ccdb; aa98d7cf59b5b0764d3502662053489585faf2fe up to, but not including, 8d431391320c5c5398ff966fb3a95e68a7def275; aa98d7cf59b5b0764d3502662053489585faf2fe up to, but not including, 978a12c91b38bf1a213e567f3c20e2beef215f07; and 2 more ranges | 2904e1d9b64f72d291095e3cbb31634f08788b11, 526235dffcac74c7823ed504dfac4f88d84ba5df, f0eea095ce8c959b86e1e57fe36ca4fea5ae54f8, a1d21bcd78cf4a4353e1e835789429c6b76aca8b, f06969df2e40ab1dc8f4364a5de967830c74a098, af82d8d2179b7277ad627c39e7e0778f1c86ccdb |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | before V1.1.1 | V1.1.1 |
| Linux | Linux Kernel | 2.6.18 up to, but not including, 4.19.316; 4.20 up to, but not including, 5.4.278; 5.5 up to, but not including, 5.10.219; 5.11 up to, but not including, 5.15.161; 5.16 up to, but not including, 6.1.93; 6.2 up to, but not including, 6.6.33; 6.7 up to, but not including, 6.8.12; 6.9 up to, but not including, 6.9.3 | 4.19.316, 5.4.278, 5.10.219, 5.15.161, 6.1.93, 6.6.33 |
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 | 7.8 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: jffs2: prevent xattr node from overflowing the eraseblock Add a check to make sure that the requested xattr node size is no larger than the eraseblock minus the cleanmarker. Unlike the usual inode nodes, the xattr nodes aren't split into parts and spread across multiple eraseblocks, which means that a xattr node must not occupy more than one eraseblock. If the requested xattr value is too large, the xattr node can spill onto the next eraseblock, overwriting the nodes and causing errors such as: jffs2: argh. node added in wrong place at 0x0000b050(2) jffs2: nextblock 0x0000a000, expected at 0000b00c jffs2: error: (823) do_verify_xattr_datum: node CRC failed at 0x01e050, read=0xfc892c93, calc=0x000000 jffs2: notice: (823) jffs2_get_inode_nodes: Node header CRC failed at 0x01e00c. {848f,2fc4,0fef511f,59a3d171} jffs2: Node at 0x0000000c with length 0x00001044 would run over the end of the erase block jffs2: Perhaps the file system was created with the wrong erase size? jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000010: 0x1044 instead This breaks the filesystem and can lead to KASAN crashes such as: BUG: KASAN: slab-out-of-bounds in jffs2_sum_add_kvec+0x125e/0x15d0 Read of size 4 at addr ffff88802c31e914 by task repro/830 CPU: 0 PID: 830 Comm: repro Not tainted 6.9.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0xc6/0x120 print_report+0xc4/0x620 ? __virt_addr_valid+0x308/0x5b0 kasan_report+0xc1/0xf0 ? jffs2_sum_add_kvec+0x125e/0x15d0 ? jffs2_sum_add_kvec+0x125e/0x15d0 jffs2_sum_add_kvec+0x125e/0x15d0 jffs2_flash_direct_writev+0xa8/0xd0 jffs2_flash_writev+0x9c9/0xef0 ? __x64_sys_setxattr+0xc4/0x160 ? do_syscall_64+0x69/0x140 ? entry_SYSCALL_64_after_hwframe+0x76/0x7e [...] Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
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/2904e1d9b64f72d291095e3cbb31634f08788b11
- git.kernel.org/stable/c/526235dffcac74c7823ed504dfac4f88d84ba5df
- git.kernel.org/stable/c/8d431391320c5c5398ff966fb3a95e68a7def275
- git.kernel.org/stable/c/978a12c91b38bf1a213e567f3c20e2beef215f07
- git.kernel.org/stable/c/a1d21bcd78cf4a4353e1e835789429c6b76aca8b
- git.kernel.org/stable/c/af82d8d2179b7277ad627c39e7e0778f1c86ccdb
- git.kernel.org/stable/c/c6854e5a267c28300ff045480b5a7ee7f6f1d913
- git.kernel.org/stable/c/f06969df2e40ab1dc8f4364a5de967830c74a098
- git.kernel.org/stable/c/f0eea095ce8c959b86e1e57fe36ca4fea5ae54f8
Other references
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.5 High severity
- 7.1 High severity
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