cbcvebase.
CVE-2025-37922
published 2025-05-20

CVE-2025-37922: In the Linux kernel, the following vulnerability has been resolved: book3s64/radix : Align section vmemmap start address to PAGE_SIZE A vmemmap altmap is a…

PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.17%
6.5th percentile
In the Linux kernel, the following vulnerability has been resolved: book3s64/radix : Align section vmemmap start address to PAGE_SIZE A vmemmap altmap is a device-provided region used to provide backing storage for struct pages. For each namespace, the altmap should belong to that same namespace. If the namespaces are created unaligned, there is a chance that the section vmemmap start address could also be unaligned. If the section vmemmap start address is unaligned, the altmap page allocated from the current namespace might be used by the previous namespace also. During the free operation, since the altmap is shared between two namespaces, the previous namespace may detect that the page does not belong to its altmap and incorrectly assume that the page is a normal page. It then attempts to free the normal page, which leads to a kernel crash. Kernel attempted to read user page (18) - exploit attempt? (uid: 0) BUG: Kernel NULL pointer dereference on read at 0x00000018 Faulting instruction address: 0xc000000000530c7c Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries CPU: 32 PID: 2104 Comm: ndctl Kdump: loaded Tainted: G W NIP: c000000000530c7c LR: c000000000530e00 CTR: 0000000000007ffe REGS: c000000015e57040 TRAP: 0300 Tainted: G W MSR: 800000000280b033 CR: 84482404 CFAR: c000000000530dfc DAR: 0000000000000018 DSISR: 40000000 IRQMASK: 0 GPR00: c000000000530e00 c000000015e572e0 c000000002c5cb00 c00c000101008040 GPR04: 0000000000000000 0000000000000007 0000000000000001 000000000000001f GPR08: 0000000000000005 0000000000000000 0000000000000018 0000000000002000 GPR12: c0000000001d2fb0 c0000060de6b0080 0000000000000000 c0000060dbf90020 GPR16: c00c000101008000 0000000000000001 0000000000000000 c000000125b20f00 GPR20: 0000000000000001 0000000000000000 ffffffffffffffff c00c000101007fff GPR24: 0000000000000001 0000000000000000 0000000000000000 0000000000000000 GPR28: 0000000004040201 0000000000000001 0000000000000000 c00c

Affected

25 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.12.29-1 (forky)linux 6.12.29-1 (forky)
linuxlinux
linuxlinux>= 368a0590d954a659b16ab945328ada0cc10f93a0 < 9a8d4d7072d4df108479b1adc4b0840e96f6f61d9a8d4d7072d4df108479b1adc4b0840e96f6f61d
linuxlinux>= 368a0590d954a659b16ab945328ada0cc10f93a0 < 7f5476d80f2cb364701cd1fa138a14b241ca99e97f5476d80f2cb364701cd1fa138a14b241ca99e9
linuxlinux>= 368a0590d954a659b16ab945328ada0cc10f93a0 < 400be767deaf31a073c6d14c5d151ae5ac2a60e2400be767deaf31a073c6d14c5d151ae5ac2a60e2
linuxlinux>= 368a0590d954a659b16ab945328ada0cc10f93a0 < 9cf7e13fecbab0894f6986fc6986ab2eba8de52e9cf7e13fecbab0894f6986fc6986ab2eba8de52e
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.12.29-16.12.29-1
linuxlinux_kernel>= 0 < 6.12.29-16.12.29-1
linuxlinux_kernel>= 0 < 6.8.0-100.1006.8.0-100.100
linuxlinux_kernel>= 0 < 6.14.0-24.246.14.0-24.24
linuxlinux_kernel>= 6.13 < 6.14.66.14.6
linuxlinux_kernel>= 6.6 < 6.6.906.6.90
linuxlinux_kernel>= 6.7 < 6.12.286.12.28
msrcazl3_kernel_6.6.85.1-4_on_azure_linux_3.0
msrcazl3_kernel_6.6.92.2-1_on_azure_linux_3.0
ubuntulinux-aws
ubuntulinux-aws-6.8
ubuntulinux-gkeop
ubuntulinux-nvidia
ubuntulinux-nvidia-6.8
ubuntulinux-oracle
ubuntulinux-oracle-6.8
ubuntulinux-raspi-realtime
ubuntulinux-realtime

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv7.8HIGH
vendor_ubuntu7.8HIGH
vendor_msrc6.7MEDIUM
vendor_debian5.5LOW
vendor_redhat5.5MEDIUM
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