PT-2022-7381 · Linux+3 · Linux Kernel+3
Syzbot
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Published
2022-09-02
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Updated
2024-10-30
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CVE-2022-48689
CVSS v3.1
7.0
High
| Vector | AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to the version that includes the fix for the issue.
Description
The issue is related to the misuse of pfmemalloc page status in TCP zerocopy paths. Using
page is pfmemalloc() in this context can give false positives. The problem is more probable after a specific commit that added a signature in the struct page, causing page is pfmemalloc() to use a low-order bit from page->lru.next, which can change more often than page->index. The KCSAN report is mostly a false positive because the low-order bit should never be set for lru.next when used as an anchor in the LRU list.Recommendations
To resolve the issue, backport the commit 84ce071e38a6 ("net: introduce skb fill page desc noacc") as a prerequisite. This change removes the use of
page is pfmemalloc() in the TCP zerocopy path, thus preventing the potential misuse and related issues. Apply this backport to ensure the stability and security of the Linux kernel.Exploit
Fix
Race Condition
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Linux Kernel
Red Os
Suse