vulnerability

Alma Linux: CVE-2024-26878: Important: kernel security update (Multiple Advisories)

Severity
4
CVSS
(AV:L/AC:M/Au:S/C:N/I:N/A:C)
Published
04/17/2024
Added
08/12/2024
Modified
01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved:

quota: Fix potential NULL pointer dereference

Below race may cause NULL pointer dereference

P1 P2
dquot_free_inode quota_off
drop_dquot_ref
remove_dquot_ref
dquots = i_dquot(inode)
dquots = i_dquot(inode)
srcu_read_lock
dquots[cnt]) != NULL (1)
dquots[type] = NULL (2)
spin_lock(&dquots[cnt]->dq_dqb_lock) (3)
....

If dquot_free_inode(or other routines) checks inode's quota pointers (1)
before quota_off sets it to NULL(2) and use it (3) after that, NULL pointer
dereference will be triggered.

So let's fix it by using a temporary pointer to avoid this issue.

Solution(s)

alma-upgrade-bpftoolalma-upgrade-kernelalma-upgrade-kernel-abi-stablelistsalma-upgrade-kernel-corealma-upgrade-kernel-cross-headersalma-upgrade-kernel-debugalma-upgrade-kernel-debug-corealma-upgrade-kernel-debug-develalma-upgrade-kernel-debug-modulesalma-upgrade-kernel-debug-modules-extraalma-upgrade-kernel-develalma-upgrade-kernel-docalma-upgrade-kernel-headersalma-upgrade-kernel-modulesalma-upgrade-kernel-modules-extraalma-upgrade-kernel-rtalma-upgrade-kernel-rt-corealma-upgrade-kernel-rt-debugalma-upgrade-kernel-rt-debug-corealma-upgrade-kernel-rt-debug-develalma-upgrade-kernel-rt-debug-kvmalma-upgrade-kernel-rt-debug-modulesalma-upgrade-kernel-rt-debug-modules-extraalma-upgrade-kernel-rt-develalma-upgrade-kernel-rt-kvmalma-upgrade-kernel-rt-modulesalma-upgrade-kernel-rt-modules-extraalma-upgrade-kernel-toolsalma-upgrade-kernel-tools-libsalma-upgrade-kernel-tools-libs-develalma-upgrade-kernel-zfcpdumpalma-upgrade-kernel-zfcpdump-corealma-upgrade-kernel-zfcpdump-develalma-upgrade-kernel-zfcpdump-modulesalma-upgrade-kernel-zfcpdump-modules-extraalma-upgrade-perfalma-upgrade-python3-perf
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