Medium 5.3Published Apr 17, 2024

CVE-2024-26901do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak

Updated under an hour ago (Oct 27, 2026, 4:30 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak syzbot identified a kernel information leak vulnerability in do_sys_name_to_handle() and issued the following report [1]. [1] "BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _copy_to_user+0xbc/0x100 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:191 [inline] do_sys_name_to_handle fs/fhandle.c:73 [inline] __do_sys_name_to_handle_at fs/fhandle.c:112 [inline] __se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94 __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94 ... Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0x121/0x3c0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] do_sys_name_to_handle fs/fhandle.c:39 [inline] __do_sys_name_to_handle_at fs/fhandle.c:112 [inline] __se_sys_name_to_handle_at+0x441/0xb10 fs/fhandle.c:94 __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94 ... Bytes 18-19 of 20 are uninitialized Memory access of size 20 starts at ffff888128a46380 Data copied to user address 0000000020000240" Per Chuck Lever's suggestion, use kzalloc() instead of kmalloc() to solve the problem.

CVSS: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	990d6c2d7aee921e3bce22b2d6a750fd552262be builds before 4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1; 990d6c2d7aee921e3bce22b2d6a750fd552262be builds before 772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b; from 990d6c2d7aee921e3bce22b2d6a750fd552262be before cde76b3af247f615447bcfecf610bb76c3529126; 990d6c2d7aee921e3bce22b2d6a750fd552262be builds before 423b6bdf19bbc5e1f7e7461045099917378f7e71; from 990d6c2d7aee921e3bce22b2d6a750fd552262be before e6450d5e46a737a008b4885aa223486113bf0ad6; from 990d6c2d7aee921e3bce22b2d6a750fd552262be before c1362eae861db28b1608b9dc23e49634fe87b63b; from 990d6c2d7aee921e3bce22b2d6a750fd552262be before cba138f1ef37ec6f961baeab62f312dedc7cf730; from 990d6c2d7aee921e3bce22b2d6a750fd552262be before bf9ec1b24ab4e94345aa1c60811dd329f069c38b; and 1 more ranges	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1.1	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.39 before 4.19.311; from 4.20 before 5.4.273; from 5.5 before 5.10.214; from 5.11 before 5.15.153; from 5.16 before 6.1.83; from 6.2 before 6.6.23; from 6.7 before 6.7.11; from 6.8 before 6.8.2	NVD

References

References

https://git.kernel.org/stable/c/4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1	patch
https://git.kernel.org/stable/c/772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b	patch
https://git.kernel.org/stable/c/cde76b3af247f615447bcfecf610bb76c3529126	patch
https://git.kernel.org/stable/c/423b6bdf19bbc5e1f7e7461045099917378f7e71	patch
https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6	patch
https://git.kernel.org/stable/c/c1362eae861db28b1608b9dc23e49634fe87b63b	patch
https://git.kernel.org/stable/c/cba138f1ef37ec6f961baeab62f312dedc7cf730	patch
https://git.kernel.org/stable/c/bf9ec1b24ab4e94345aa1c60811dd329f069c38b	patch
https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43	patch
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.