vulnerability

Ubuntu: (Multiple Advisories) (CVE-2024-26956): Linux kernel vulnerabilities

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
05/01/2024
Added
07/01/2024
Modified
02/20/2025

Description

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

nilfs2: fix failure to detect DAT corruption in btree and direct mappings

Patch series "nilfs2: fix kernel bug at submit_bh_wbc()".

This resolves a kernel BUG reported by syzbot. Since there are two
flaws involved, I've made each one a separate patch.

The first patch alone resolves the syzbot-reported bug, but I think
both fixes should be sent to stable, so I've tagged them as such.

This patch (of 2):

Syzbot has reported a kernel bug in submit_bh_wbc() when writing file data
to a nilfs2 file system whose metadata is corrupted.

There are two flaws involved in this issue.

The first flaw is that when nilfs_get_block() locates a data block using
btree or direct mapping, if the disk address translation routine
nilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata
corruption, it can be passed back to nilfs_get_block(). This causes
nilfs_get_block() to misidentify an existing block as non-existent,
causing both data block lookup and insertion to fail inconsistently.

The second flaw is that nilfs_get_block() returns a successful status in
this inconsistent state. This causes the caller __block_write_begin_int()
or others to request a read even though the buffer is not mapped,
resulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc()
failing.

This fixes the first issue by changing the return value to code -EINVAL
when a conversion using DAT fails with code -ENOENT, avoiding the
conflicting condition that leads to the kernel bug described above. Here,
code -EINVAL indicates that metadata corruption was detected during the
block lookup, which will be properly handled as a file system error and
converted to -EIO when passing through the nilfs2 bmap layer.

Solution(s)

ubuntu-upgrade-linux-image-5-15-0-1035-xilinx-zynqmpubuntu-upgrade-linux-image-5-15-0-1048-gkeopubuntu-upgrade-linux-image-5-15-0-1058-ibmubuntu-upgrade-linux-image-5-15-0-1058-raspiubuntu-upgrade-linux-image-5-15-0-1060-intel-iotgubuntu-upgrade-linux-image-5-15-0-1060-nvidiaubuntu-upgrade-linux-image-5-15-0-1060-nvidia-lowlatencyubuntu-upgrade-linux-image-5-15-0-1062-gkeubuntu-upgrade-linux-image-5-15-0-1062-kvmubuntu-upgrade-linux-image-5-15-0-1063-oracleubuntu-upgrade-linux-image-5-15-0-1064-gcpubuntu-upgrade-linux-image-5-15-0-1065-awsubuntu-upgrade-linux-image-5-15-0-1065-gcpubuntu-upgrade-linux-image-5-15-0-1068-azureubuntu-upgrade-linux-image-5-15-0-1068-azure-fdeubuntu-upgrade-linux-image-5-15-0-116-genericubuntu-upgrade-linux-image-5-15-0-116-generic-64kubuntu-upgrade-linux-image-5-15-0-116-generic-lpaeubuntu-upgrade-linux-image-5-15-0-116-lowlatencyubuntu-upgrade-linux-image-5-15-0-116-lowlatency-64kubuntu-upgrade-linux-image-5-4-0-1040-iotubuntu-upgrade-linux-image-5-4-0-1047-xilinx-zynqmpubuntu-upgrade-linux-image-5-4-0-1075-ibmubuntu-upgrade-linux-image-5-4-0-1088-bluefieldubuntu-upgrade-linux-image-5-4-0-1095-gkeopubuntu-upgrade-linux-image-5-4-0-1112-raspiubuntu-upgrade-linux-image-5-4-0-1116-kvmubuntu-upgrade-linux-image-5-4-0-1127-oracleubuntu-upgrade-linux-image-5-4-0-1128-awsubuntu-upgrade-linux-image-5-4-0-1132-gcpubuntu-upgrade-linux-image-5-4-0-1133-azureubuntu-upgrade-linux-image-5-4-0-189-genericubuntu-upgrade-linux-image-5-4-0-189-generic-lpaeubuntu-upgrade-linux-image-5-4-0-189-lowlatencyubuntu-upgrade-linux-image-6-8-0-1004-gkeubuntu-upgrade-linux-image-6-8-0-1005-raspiubuntu-upgrade-linux-image-6-8-0-1006-ibmubuntu-upgrade-linux-image-6-8-0-1006-oemubuntu-upgrade-linux-image-6-8-0-1006-oracleubuntu-upgrade-linux-image-6-8-0-1006-oracle-64kubuntu-upgrade-linux-image-6-8-0-1008-azureubuntu-upgrade-linux-image-6-8-0-1008-azure-fdeubuntu-upgrade-linux-image-6-8-0-1008-gcpubuntu-upgrade-linux-image-6-8-0-1009-awsubuntu-upgrade-linux-image-6-8-0-35-genericubuntu-upgrade-linux-image-6-8-0-35-generic-64kubuntu-upgrade-linux-image-6-8-0-35-lowlatencyubuntu-upgrade-linux-image-6-8-0-35-lowlatency-64kubuntu-upgrade-linux-image-awsubuntu-upgrade-linux-image-aws-lts-20-04ubuntu-upgrade-linux-image-aws-lts-22-04ubuntu-upgrade-linux-image-azureubuntu-upgrade-linux-image-azure-cvmubuntu-upgrade-linux-image-azure-fdeubuntu-upgrade-linux-image-azure-fde-lts-22-04ubuntu-upgrade-linux-image-azure-lts-20-04ubuntu-upgrade-linux-image-azure-lts-22-04ubuntu-upgrade-linux-image-bluefieldubuntu-upgrade-linux-image-gcpubuntu-upgrade-linux-image-gcp-lts-20-04ubuntu-upgrade-linux-image-gcp-lts-22-04ubuntu-upgrade-linux-image-genericubuntu-upgrade-linux-image-generic-64kubuntu-upgrade-linux-image-generic-64k-hwe-20-04ubuntu-upgrade-linux-image-generic-64k-hwe-24-04ubuntu-upgrade-linux-image-generic-hwe-18-04ubuntu-upgrade-linux-image-generic-hwe-20-04ubuntu-upgrade-linux-image-generic-hwe-24-04ubuntu-upgrade-linux-image-generic-lpaeubuntu-upgrade-linux-image-generic-lpae-hwe-20-04ubuntu-upgrade-linux-image-gkeubuntu-upgrade-linux-image-gke-5-15ubuntu-upgrade-linux-image-gkeopubuntu-upgrade-linux-image-gkeop-5-15ubuntu-upgrade-linux-image-gkeop-5-4ubuntu-upgrade-linux-image-ibmubuntu-upgrade-linux-image-ibm-classicubuntu-upgrade-linux-image-ibm-lts-20-04ubuntu-upgrade-linux-image-ibm-lts-24-04ubuntu-upgrade-linux-image-intelubuntu-upgrade-linux-image-intel-iotgubuntu-upgrade-linux-image-kvmubuntu-upgrade-linux-image-lowlatencyubuntu-upgrade-linux-image-lowlatency-64kubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04ubuntu-upgrade-linux-image-lowlatency-hwe-18-04ubuntu-upgrade-linux-image-lowlatency-hwe-20-04ubuntu-upgrade-linux-image-nvidiaubuntu-upgrade-linux-image-nvidia-lowlatencyubuntu-upgrade-linux-image-oemubuntu-upgrade-linux-image-oem-20-04ubuntu-upgrade-linux-image-oem-20-04bubuntu-upgrade-linux-image-oem-20-04cubuntu-upgrade-linux-image-oem-20-04dubuntu-upgrade-linux-image-oem-24-04ubuntu-upgrade-linux-image-oem-24-04aubuntu-upgrade-linux-image-oem-osp1ubuntu-upgrade-linux-image-oracleubuntu-upgrade-linux-image-oracle-64kubuntu-upgrade-linux-image-oracle-lts-20-04ubuntu-upgrade-linux-image-oracle-lts-22-04ubuntu-upgrade-linux-image-raspiubuntu-upgrade-linux-image-raspi-hwe-18-04ubuntu-upgrade-linux-image-raspi-nolpaeubuntu-upgrade-linux-image-raspi2ubuntu-upgrade-linux-image-snapdragon-hwe-18-04ubuntu-upgrade-linux-image-virtualubuntu-upgrade-linux-image-virtual-hwe-18-04ubuntu-upgrade-linux-image-virtual-hwe-20-04ubuntu-upgrade-linux-image-virtual-hwe-24-04ubuntu-upgrade-linux-image-xilinx-zynqmp
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