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 reiserfs-kmp-64kbUpgrade kernel-rt-optionalUpgrade dlm-kmp-defaultUpgrade dtb-socionextUpgrade kernel-docs-htmlUpgrade gfs2-kmp-defaultUpgrade kernel-rt_debugUpgrade dtb-sprdUpgrade dtb-renesasUpgrade ocfs2-kmp-defaultUpgrade kernel-rt-livepatchUpgrade kernel-azureUpgrade kernel-default-optionalUpgrade ocfs2-kmp-azureUpgrade dtb-nvidiaUpgrade kernel-default-livepatch-develUpgrade kernel-develUpgrade ocfs2-kmp-64kbUpgrade kernel-rt-extraUpgrade kernel-default-base-rebuildUpgrade cluster-md-kmp-rtUpgrade kernel-docsUpgrade kernel-debug-vdsoUpgrade dtb-allwinnerUpgrade kernel-azure-optionalUpgrade reiserfs-kmp-rtUpgrade kernel-kvmsmall-vdsoUpgrade dlm-kmp-rtUpgrade kernel-source-rtUpgrade dtb-rockchipUpgrade kselftests-kmp-rtUpgrade reiserfs-kmp-defaultUpgrade dtb-caviumUpgrade kernel-rt-vdsoUpgrade dtb-broadcomUpgrade kernel-default-baseUpgrade cluster-md-kmp-64kbUpgrade kselftests-kmp-azureUpgrade kernel-source-vanillaUpgrade kernel-rt_debug-develUpgrade kernel-64kb-extraUpgrade dtb-alteraUpgrade kernel-rt_debug-livepatch-develUpgrade reiserfs-kmp-azureUpgrade gfs2-kmp-azureUpgrade kernel-obs-buildUpgrade kernel-defaultUpgrade kernel-symsUpgrade kernel-sourceUpgrade kernel-kvmsmall-develUpgrade kernel-debug-develUpgrade kselftests-kmp-defaultUpgrade kernel-debugUpgrade kernel-rt-livepatch-develUpgrade kernel-kvmsmall-livepatch-develUpgrade gfs2-kmp-64kbUpgrade kernel-azure-extraUpgrade dtb-amlogicUpgrade kernel-kvmsmallUpgrade kernel-devel-rtUpgrade kernel-debug-livepatch-develUpgrade kernel-rt_debug-vdsoUpgrade kernel-azure-develUpgrade kernel-azure-vdsoUpgrade dtb-exynosUpgrade dtb-hisiliconUpgrade dtb-marvellUpgrade dtb-amdUpgrade kernel-64kb-develUpgrade kernel-64kb-optionalUpgrade ocfs2-kmp-rtUpgrade kernel-macrosUpgrade dtb-qcomUpgrade kselftests-kmp-64kbUpgrade kernel-rt-develUpgrade dtb-armUpgrade kernel-default-develUpgrade dtb-lgUpgrade dtb-appleUpgrade cluster-md-kmp-defaultUpgrade dtb-apmUpgrade dtb-freescaleUpgrade kernel-azure-livepatch-develUpgrade kernel-rtUpgrade dtb-amazonUpgrade kernel-default-livepatchUpgrade kernel-source-azureUpgrade cluster-md-kmp-azureUpgrade kernel-default-extraUpgrade dtb-mediatekUpgrade gfs2-kmp-rtUpgrade kernel-64kbUpgrade kernel-syms-azureUpgrade kernel-devel-azureUpgrade dlm-kmp-64kbUpgrade kernel-syms-rtUpgrade kernel-zfcpdumpUpgrade kernel-obs-qaUpgrade kernel-default-vdsoUpgrade dtb-xilinxUpgrade kernel-64kb-livepatch-develUpgrade dlm-kmp-azure | Aug 9, 2024 | May 21, 2024 |
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