CVE - CVE-2024-50199

CVE-ID
CVE-2024-50199	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: mm/swapfile: skip HugeTLB pages for unuse_vma I got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The problem can be reproduced by the following steps: 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory. 2. Swapout the above anonymous memory. 3. run swapoff and we will get a bad pud error in kernel message: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) We can tell that pud_clear_bad is called by pud_none_or_clear_bad in unuse_pud_range() by ftrace. And therefore the HugeTLB pages will never be freed because we lost it from page table. We can skip HugeTLB pages for unuse_vma to fix it.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b URL:https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b MISC:https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf URL:https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf MISC:https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d URL:https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d MISC:https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496 URL:https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496 MISC:https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8 URL:https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8 MISC:https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7 URL:https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7 MISC:https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87 URL:https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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