CVE-2024-53097: mm: krealloc: Fix MTE false alarm in __do_krealloc
First published: Mon Nov 25 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: mm: krealloc: Fix MTE false alarm in __do_krealloc This patch addresses an issue introduced by commit 1a83a716ec233 ("mm: krealloc: consider spare memory for __GFP_ZERO") which causes MTE (Memory Tagging Extension) to falsely report a slab-out-of-bounds error. The problem occurs when zeroing out spare memory in __do_krealloc. The original code only considered software-based KASAN and did not account for MTE. It does not reset the KASAN tag before calling memset, leading to a mismatch between the pointer tag and the memory tag, resulting in a false positive. Example of the error: ================================================================== swapper/0: BUG: KASAN: slab-out-of-bounds in __memset+0x84/0x188 swapper/0: Write at addr f4ffff8005f0fdf0 by task swapper/0/1 swapper/0: Pointer tag: [f4], memory tag: [fe] swapper/0: swapper/0: CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12. swapper/0: Hardware name: MT6991(ENG) (DT) swapper/0: Call trace: swapper/0: dump_backtrace+0xfc/0x17c swapper/0: show_stack+0x18/0x28 swapper/0: dump_stack_lvl+0x40/0xa0 swapper/0: print_report+0x1b8/0x71c swapper/0: kasan_report+0xec/0x14c swapper/0: __do_kernel_fault+0x60/0x29c swapper/0: do_bad_area+0x30/0xdc swapper/0: do_tag_check_fault+0x20/0x34 swapper/0: do_mem_abort+0x58/0x104 swapper/0: el1_abort+0x3c/0x5c swapper/0: el1h_64_sync_handler+0x80/0xcc swapper/0: el1h_64_sync+0x68/0x6c swapper/0: __memset+0x84/0x188 swapper/0: btf_populate_kfunc_set+0x280/0x3d8 swapper/0: __register_btf_kfunc_id_set+0x43c/0x468 swapper/0: register_btf_kfunc_id_set+0x48/0x60 swapper/0: register_nf_nat_bpf+0x1c/0x40 swapper/0: nf_nat_init+0xc0/0x128 swapper/0: do_one_initcall+0x184/0x464 swapper/0: do_initcall_level+0xdc/0x1b0 swapper/0: do_initcalls+0x70/0xc0 swapper/0: do_basic_setup+0x1c/0x28 swapper/0: kernel_init_freeable+0x144/0x1b8 swapper/0: kernel_init+0x20/0x1a8 swapper/0: ret_from_fork+0x10/0x20 ==================================================================
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.10.227<5.10.230 | |
| Linux Kernel | >=5.15.168<5.15.173 | |
| Linux Kernel | >=6.1.113<6.1.118 | |
| Linux Kernel | >=6.6.55<6.6.62 | |
| Linux Kernel | >=6.11.3<6.11.9 | |
| Linux Kernel | =6.10.14 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/8ebee7565effdeae6085458f8f8463363120a871
- https://git.kernel.org/stable/c/d02492863023431c31f85d570f718433c22b9311
- https://git.kernel.org/stable/c/d43f1430d47c22a0727c05b6f156ed25fecdfeb4
- https://git.kernel.org/stable/c/486aeb5f1855c75dd810c25036134961bd2a6722
- https://git.kernel.org/stable/c/71548fada7ee0eb50cc6ccda82dff010c745f92c
- https://git.kernel.org/stable/c/3dfb40da84f26dd35dd9bbaf626a2424565b8406
- https://git.kernel.org/stable/c/704573851b51808b45dae2d62059d1d8189138a2
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-53097
- https://nvd.nist.gov/vuln/detail/CVE-2024-53097
- https://launchpad.net/bugs/cve/CVE-2024-53097
- https://security-tracker.debian.org/tracker/CVE-2024-53097
- https://ubuntu.com/security/CVE-2024-53097
- https://git.kernel.org/linus/704573851b51808b45dae2d62059d1d8189138a2
Frequently Asked Questions
What is the severity of CVE-2024-53097?
CVE-2024-53097 has a medium severity rating due to the potential impact on memory handling in the Linux kernel.
How do I fix CVE-2024-53097?
To fix CVE-2024-53097, update the Linux kernel to the latest version that includes the patch addressing this vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-53097?
CVE-2024-53097 affects specific versions of the Linux kernel between 5.10.227 to 5.10.230, 5.15.168 to 5.15.173, and similar ranges for other versions.
What causes the issue described in CVE-2024-53097?
The issue in CVE-2024-53097 is caused by improper handling of memory tagging extensions related to the krealloc function in the Linux kernel.
Is CVE-2024-53097 a remote exploit issue?
CVE-2024-53097 primarily affects local processes and is not typically considered a remote exploit vulnerability.
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