CVE-2024-53097

mm: krealloc: Fix MTE false alarm in __do_krealloc

State: Published
Severity: 5.5 Medium
Published: Nov 25, 2024
Updated: May 23, 2026
Reserved: Nov 19, 2024

Description

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 ==================================================================

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c383263ee82a01a5a9bc1a466025ccde39a38cae to before 8ebee7565effdeae6085458f8f8463363120a871Affected a543785856249a5ba8c20468098601c0c33b1224 to before d02492863023431c31f85d570f718433c22b9311Affected 44f79667fefd52945a44d2a57a2cd3c554d7f4e0 to before d43f1430d47c22a0727c05b6f156ed25fecdfeb4Affected f8767d10bcbc2529540eb906906c0058e15cd918 to before 486aeb5f1855c75dd810c25036134961bd2a6722Affected e3a9fc1520a6606c6121aca8d6679c6b93de7fd8 to before 71548fada7ee0eb50cc6ccda82dff010c745f92cAffected 3e9a65a38706866bf93e19f5b4936465188add10 to before 3dfb40da84f26dd35dd9bbaf626a2424565b8406Affected 1a83a716ec233990e1fd5b6fbb1200ade63bf450 to before 704573851b51808b45dae2d62059d1d8189138a2Affected 73388659ef0eea51747350530afdeadf8809ce9cAffected 6.10.14 to before 6.11Affected
LinuxLinux	5.10.227 to before 5.10.230Affected 5.15.168 to before 5.15.173Affected 6.1.113 to before 6.1.118Affected 6.6.55 to before 6.6.62Affected 6.11.3 to before 6.11.9Affected

Product

Versions

LinuxLinux

c383263ee82a01a5a9bc1a466025ccde39a38cae to before 8ebee7565effdeae6085458f8f8463363120a871Affected
a543785856249a5ba8c20468098601c0c33b1224 to before d02492863023431c31f85d570f718433c22b9311Affected
44f79667fefd52945a44d2a57a2cd3c554d7f4e0 to before d43f1430d47c22a0727c05b6f156ed25fecdfeb4Affected
f8767d10bcbc2529540eb906906c0058e15cd918 to before 486aeb5f1855c75dd810c25036134961bd2a6722Affected
e3a9fc1520a6606c6121aca8d6679c6b93de7fd8 to before 71548fada7ee0eb50cc6ccda82dff010c745f92cAffected
3e9a65a38706866bf93e19f5b4936465188add10 to before 3dfb40da84f26dd35dd9bbaf626a2424565b8406Affected
1a83a716ec233990e1fd5b6fbb1200ade63bf450 to before 704573851b51808b45dae2d62059d1d8189138a2Affected
73388659ef0eea51747350530afdeadf8809ce9cAffected
6.10.14 to before 6.11Affected

LinuxLinux

5.10.227 to before 5.10.230Affected
5.15.168 to before 5.15.173Affected
6.1.113 to before 6.1.118Affected
6.6.55 to before 6.6.62Affected
6.11.3 to before 6.11.9Affected

References

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