In the Linux kernel, the following vulnerability has been resolved:
afs: Fix page leak
There's a loop in afs_extend_writeback() that adds extra pages to a write we want to make to improve the efficiency of the writeback by making it larger. This loop stops, however, if we hit a page we can't write back from immediately, but it doesn't get rid of the page ref we speculatively acquired.
This was caused by the removal of the cleanup loop when the code switched from using find_get_pages_contig() to xarray scanning as the latter only gets a single page at a time, not a batch.
Fix this by putting the page on a ref on an early break from the loop. Unfortunately, we can't just add that page to the pagevec we're employing as we'll go through that and add those pages to the RPC call.
This was found by the generic/074 test. It leaks ~4GiB of RAM each time it is run - which can be observed with "top".
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 21, 2024 |
| Suse | — | Upgrade kernel-rt-livepatchUpgrade reiserfs-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade ocfs2-kmp-azureUpgrade kernel-azureUpgrade kselftests-kmp-azureUpgrade gfs2-kmp-defaultUpgrade dtb-sprdUpgrade kernel-rt-optionalUpgrade dtb-alteraUpgrade reiserfs-kmp-azureUpgrade dtb-renesasUpgrade dtb-nvidiaUpgrade kernel-kvmsmall-vdsoUpgrade dlm-kmp-defaultUpgrade dtb-broadcomUpgrade reiserfs-kmp-64kbUpgrade kernel-64kb-extraUpgrade kernel-default-livepatch-develUpgrade dtb-socionextUpgrade kernel-develUpgrade kernel-azure-optionalUpgrade kernel-default-optionalUpgrade kernel-rt-extraUpgrade kernel-docs-htmlUpgrade kernel-docsUpgrade kernel-rt_debug-develUpgrade kselftests-kmp-rtUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-rockchipUpgrade dlm-kmp-rtUpgrade dtb-allwinnerUpgrade kernel-source-rtUpgrade ocfs2-kmp-64kbUpgrade gfs2-kmp-azureUpgrade kernel-debug-vdsoUpgrade kernel-default-base-rebuildUpgrade cluster-md-kmp-rtUpgrade kernel-obs-buildUpgrade cluster-md-kmp-64kbUpgrade kernel-rt_debugUpgrade dtb-caviumUpgrade reiserfs-kmp-defaultUpgrade kernel-source-vanillaUpgrade kernel-default-baseUpgrade kernel-rt-vdsoUpgrade kernel-defaultUpgrade dtb-amlogicUpgrade kernel-kvmsmall-livepatch-develUpgrade dtb-xilinxUpgrade dtb-armUpgrade dtb-amazonUpgrade dtb-freescaleUpgrade ocfs2-kmp-rtUpgrade dtb-amdUpgrade dtb-marvellUpgrade kernel-azure-vdsoUpgrade kernel-azure-develUpgrade kernel-macrosUpgrade kernel-64kbUpgrade kernel-debug-develUpgrade kernel-64kb-optionalUpgrade kernel-64kb-develUpgrade dtb-qcomUpgrade dtb-hisiliconUpgrade dlm-kmp-azureUpgrade kselftests-kmp-defaultUpgrade kernel-rtUpgrade kernel-devel-azureUpgrade kernel-debug-livepatch-develUpgrade kernel-rt_debug-vdsoUpgrade kernel-source-azureUpgrade kernel-symsUpgrade kernel-debugUpgrade gfs2-kmp-64kbUpgrade dtb-mediatekUpgrade cluster-md-kmp-defaultUpgrade kernel-rt-livepatch-develUpgrade dtb-lgUpgrade kernel-devel-rtUpgrade kernel-default-develUpgrade kernel-azure-livepatch-develUpgrade dtb-appleUpgrade dtb-apmUpgrade cluster-md-kmp-azureUpgrade kernel-sourceUpgrade kernel-kvmsmall-develUpgrade kernel-zfcpdumpUpgrade kernel-default-livepatchUpgrade kernel-obs-qaUpgrade kernel-64kb-livepatch-develUpgrade dlm-kmp-64kbUpgrade kernel-syms-rtUpgrade kernel-default-vdsoUpgrade kernel-azure-extraUpgrade kernel-syms-azureUpgrade gfs2-kmp-rtUpgrade kernel-default-extraUpgrade dtb-exynosUpgrade kernel-kvmsmallUpgrade kernel-rt-develUpgrade kselftests-kmp-64kb | Aug 9, 2024 | May 21, 2024 |
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