CVE-2024-56560

published 2024-12-27

CVE-2024-56560: In the Linux kernel, the following vulnerability has been resolved: slab: Fix too strict alignment check in create_cache() On m68k, where the minimum alignment…

Priority P4 22 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

slab: Fix too strict alignment check in create_cache()

On m68k, where the minimum alignment of unsigned long is 2 bytes:

Kernel panic - not syncing: __kmem_cache_create_args: Failed to create slab 'io_kiocb'. Error -22
CPU: 0 UID: 0 PID: 1 Comm: swapper Not tainted 6.12.0-atari-03776-g7eaa1f99261a #1783
Stack from 0102fe5c:
0102fe5c 00514a2b 00514a2b ffffff00 00000001 0051f5ed 00425e78 00514a2b
0041eb74 ffffffea 00000310 0051f5ed ffffffea ffffffea 00601f60 00000044
0102ff20 000e7a68 0051ab8e 004383b8 0051f5ed ffffffea 000000b8 00000007
01020c00 00000000 000e77f0 0041e5f0 005f67c0 0051f5ed 000000b6 0102fef4
00000310 0102fef4 00000000 00000016 005f676c 0060a34c 00000010 00000004
00000038 0000009a 01000000 000000b8 005f668e 0102e000 00001372 0102ff88
Call Trace: [] dump_stack+0xc/0x10
[] panic+0xd8/0x26c
[] __kmem_cache_create_args+0x278/0x2e8
[] __kmem_cache_create_args+0x0/0x2e8
[] memset+0x0/0x8c
[] io_uring_init+0x54/0xd2

The minimal alignment of an integral type may differ from its size,
hence is not safe to assume that an arbitrary freeptr_t (which is
basically an unsigned long) is always aligned to 4 or 8 bytes.

As nothing seems to require the additional alignment, it is safe to fix
this by relaxing the check to the actual minimum alignment of freeptr_t.

Affected

7 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.12.5-1 (forky)	linux 6.12.5-1 (forky)
linux	linux	—	—
linux	linux	>= d345bd2e9834e2da505977e154a1c179c793b7b2 < 8b5aea5e5186733fa4e5aa4293b0a65a933f1a16	8b5aea5e5186733fa4e5aa4293b0a65a933f1a16
linux	linux	>= d345bd2e9834e2da505977e154a1c179c793b7b2 < 9008fe8fad8255edfdbecea32d7eb0485d939d0d	9008fe8fad8255edfdbecea32d7eb0485d939d0d
linux	linux_kernel	>= 0 < 6.12.5-1	6.12.5-1
linux	linux_kernel	>= 0 < 6.12.5-1	6.12.5-1
linux	linux_kernel	>= 6.12 < 6.12.4	6.12.4

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 LOW

vendor_redhat 5.5 MEDIUM

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