ext4: publish jinode after initialization
In the Linux kernel, the following vulnerability has been resolved: ext4: publish jinode after initialization ext4_inode_attach_jinode() publishes ei->jinode to concurrent users. It used to set ei->jinode before jbd2_journal_init_jbd_inode(), allowing a reader to observe a non-NULL jinode with i_vfs_inode still unset. The fast commit flush path can then pass this jinode to jbd2_wait_inode_data(), which dereferences i_vfs_inode->i_mapping and may crash. Below is the crash I observe: ``` BUG: unable to handle page fault for address: 000000010beb47f4 PGD 110e51067 P4D 110e51067 PUD 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 1 UID: 0 PID: 4850 Comm: fc_fsync_bench_ Not tainted 6.18.0-00764-g795a690c06a5 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.17.0-2-2 04/01/2014 RIP: 0010:xas_find_marked+0x3d/0x2e0 Code: e0 03 48 83 f8 02 0f 84 f0 01 00 00 48 8b 47 08 48 89 c3 48 39 c6 0f 82 fd 01 00 00 48 85 c9 74 3d 48 83 f9 03 77 63 4c 8b 0f <49> 8b 71 08 48 c7 47 18 00 00 00 00 48 89 f1 83 e1 03 48 83 f9 02 RSP: 0018:ffffbbee806e7bf0 EFLAGS: 00010246 RAX: 000000000010beb4 RBX: 000000000010beb4 RCX: 0000000000000003 RDX: 0000000000000001 RSI: 0000002000300000 RDI: ffffbbee806e7c10 RBP: 0000000000000001 R08: 0000002000300000 R09: 000000010beb47ec R10: ffff9ea494590090 R11: 0000000000000000 R12: 0000002000300000 R13: ffffbbee806e7c90 R14: ffff9ea494513788 R15: ffffbbee806e7c88 FS: 00007fc2f9e3e6c0(0000) GS:ffff9ea6b1444000(0000) knlGS:0000000000
CVE-2026-31450
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31450
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a361293f5fedea0016a10599f409631a15d47ee7",
"lessThan": "2d2b648960147d078b000b9a7494017082024366",
"versionType": "git"
},
{
"status": "affected",
"version": "a361293f5fedea0016a10599f409631a15d47ee7",
"lessThan": "e4325e84727e539c8597bd5b8491349f57f7fb17",
"versionType": "git"
},
{
"status": "affected",
"version": "a361293f5fedea0016a10599f409631a15d47ee7",
"lessThan": "be54c0055407a73b60349c093c8ce621cb8fa232",
"versionType": "git"
},
{
"status": "affected",
"version": "a361293f5fedea0016a10599f409631a15d47ee7",
"lessThan": "a070d5a872ffe0e0fe5c46eda6386140ded39adb",
"versionType": "git"
},
{
"status": "affected",
"version": "a361293f5fedea0016a10599f409631a15d47ee7",
"lessThan": "e76bcb727e4874a2f9d0297f8e3f8eced89b0764",
"versionType": "git"
},
{
"status": "affected",
"version": "a361293f5fedea0016a10599f409631a15d47ee7",
"lessThan": "4855a59e21789c79f003a9b5f4135c95a7495c6b",
"versionType": "git"
},
{
"status": "affected",
"version": "a361293f5fedea0016a10599f409631a15d47ee7",
"lessThan": "33f486987af21531a7b18973d11795ede3da9ddd",
"versionType": "git"
},
{
"status": "affected",
"version": "a361293f5fedea0016a10599f409631a15d47ee7",
"lessThan": "1aec30021edd410b986c156f195f3d23959a9d11",
"versionType": "git"
}
],
"programFiles": [
"fs/ext4/fast_commit.c",
"fs/ext4/inode.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ext4/fast_commit.c",
"fs/ext4/inode.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31450
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39881 · Revision 1
- Added to Heist Feed
- Publisher date