CVE-2024-47723: jfs: fix out-of-bounds in dbNextAG() and diAlloc()
In the Linux kernel, the following vulnerability has been resolved:
jfs: fix out-of-bounds in dbNextAG() and diAlloc()
In dbNextAG() , there is no check for the case where bmp->dbnumag is greater or same than MAXAG due to a polluted image, which causes an out-of-bounds. Therefore, a bounds check should be added in dbMount().
And in dbNextAG(), a check for the case where agpref is greater than bmp->dbnumag should be added, so an out-of-bounds exception should be prevented.
Additionally, a check for the case where agno is greater or same than MAXAG should be added in diAlloc() to prevent out-of-bounds.
Other sources
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— Launchpad
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1 - Upgrade
Upgrade
debian/linux-6.1to a version that resolves this vulnerability.Fixed in 6.1.129-1~deb11u1 - Configuration
Add in diAlloc() a check for the case where agno is greater or same than MAXAG; add in dbNextAG() a check where agpref is greater than bmp->db_numag; and add/ensure bounds checks related to bmp->db_numag vs MAXAG (per the resolved issue description) so polluted images cannot trigger out-of-bounds in dbNextAG() and diAlloc().
Linux kernel - JFS (jfs) Add bounds checks in functions dbNextAG(), diAlloc() and dbMount() = Implement missing checks for agno/ agpref and bmp->db_numag vs MAXAG to prevent out-of-bounds
Event History
Frequently Asked Questions
What is the severity of CVE-2024-47723?
CVE-2024-47723 has been classified with a medium severity level due to its potential for causing out-of-bounds access.
How do I fix CVE-2024-47723?
To resolve CVE-2024-47723, it is recommended to update the Linux kernel to versions that include the patch, such as 6.1.123-1 or 6.12.12-1.
Which versions of the Linux kernel are affected by CVE-2024-47723?
CVE-2024-47723 affects multiple versions of the Linux kernel ranging from 2.6.12 to 6.11.2.
What is the impact of CVE-2024-47723?
The impact of CVE-2024-47723 can lead to potential crashes or unexpected behaviors in systems using the affected versions of the Linux kernel.
Is there a workaround for CVE-2024-47723?
There may not be any effective workarounds besides applying the necessary kernel updates to mitigate CVE-2024-47723.