CVE-2024-57839

Revert "readahead: properly shorten readahead when falling back to do_page_cache_ra()"

Description

In the Linux kernel, the following vulnerability has been resolved: Revert "readahead: properly shorten readahead when falling back to do_page_cache_ra()" This reverts commit 7c877586da3178974a8a94577b6045a48377ff25. Anders and Philippe have reported that recent kernels occasionally hang when used with NFS in readahead code. The problem has been bisected to 7c877586da3 ("readahead: properly shorten readahead when falling back to do_page_cache_ra()"). The cause of the problem is that ra->size can be shrunk by read_pages() call and subsequently we end up calling do_page_cache_ra() with negative (read huge positive) number of pages. Let's revert 7c877586da3 for now until we can find a proper way how the logic in read_pages() and page_cache_ra_order() can coexist. This can lead to reduced readahead throughput due to readahead window confusion but that's better than outright hangs.

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/85351e4941a253e4c50fb7048bfc19b60b4ec44b
https://git.kernel.org/stable/c/a220d6b95b1ae12c7626283d7609f0a1438e6437

Frequently Asked Questions

What is the severity of CVE-2024-57839?: CVE-2024-57839 has not yet been assigned a CVSS score.
How to fix CVE-2024-57839?: To fix CVE-2024-57839, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-57839 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-57839 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-57839?: CVE-2024-57839 affects Linux Linux, Linux Linux.

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