ext4: fix bug_on in __es_tree_search
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug_on in __es_tree_search Hulk Robot reported a BUG_ON: ================================================================== kernel BUG at fs/ext4/extents_status.c:199! [...] RIP: 0010:ext4_es_end fs/ext4/extents_status.c:199 [inline] RIP: 0010:__es_tree_search+0x1e0/0x260 fs/ext4/extents_status.c:217 [...] Call Trace: ext4_es_cache_extent+0x109/0x340 fs/ext4/extents_status.c:766 ext4_cache_extents+0x239/0x2e0 fs/ext4/extents.c:561 ext4_find_extent+0x6b7/0xa20 fs/ext4/extents.c:964 ext4_ext_map_blocks+0x16b/0x4b70 fs/ext4/extents.c:4384 ext4_map_blocks+0xe26/0x19f0 fs/ext4/inode.c:567 ext4_getblk+0x320/0x4c0 fs/ext4/inode.c:980 ext4_bread+0x2d/0x170 fs/ext4/inode.c:1031 ext4_quota_read+0x248/0x320 fs/ext4/super.c:6257 v2_read_header+0x78/0x110 fs/quota/quota_v2.c:63 v2_check_quota_file+0x76/0x230 fs/quota/quota_v2.c:82 vfs_load_quota_inode+0x5d1/0x1530 fs/quota/dquot.c:2368 dquot_enable+0x28a/0x330 fs/quota/dquot.c:2490 ext4_quota_enable fs/ext4/super.c:6137 [inline] ext4_enable_quotas+0x5d7/0x960 fs/ext4/super.c:6163 ext4_fill_super+0xa7c9/0xdc00 fs/ext4/super.c:4754 mount_bdev+0x2e9/0x3b0 fs/super.c:1158 mount_fs+0x4b/0x1e4 fs/super.c:1261 [...] ================================================================== Above issue may happen as follows: ------------------------------------- ext4_fill_super ext4_enable_quotas ext4_quota_enable ext4_iget __ext4_iget ext4_ext_check_inode ext4_ext_check __ext4_ext_check ext4_valid_extent_entries Check for overlapping extents does't take effect dquot_enable vfs_load_quota_inode v2_check_quota_file v2_read_header ext4_quota_read ext4_bread ext4_getblk ext4_map_blocks ext4_ext_map_blocks ext4_find_extent ext4_cache_extents ext4_es_cache_extent ext4_es_cache_extent __es_tree_search ext4_es_end BUG_ON(es->es_lblk + es->es_len < es->es_lblk) The error ext4 extents is as follows: 0af3 0300 0400 0000 00000000 extent_header 00000000 0100 0000 12000000 extent1 00000000 0100 0000 18000000 extent2 02000000 0400 0000 14000000 extent3 In the ext4_valid_extent_entries function, if prev is 0, no error is returned even if lblock<=prev. This was intended to skip the check on the first extent, but in the error image above, prev=0+1-1=0 when checking the second extent, so even though lblock<=prev, the function does not return an error. As a result, bug_ON occurs in __es_tree_search and the system panics. To solve this problem, we only need to check that: 1. The lblock of the first extent is not less than 0. 2. The lblock of the next extent is not less than the next block of the previous extent. The same applies to extent_idx.
- Published
- Feb 26, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.3% · 18th percentile
- CWE
- CWE-617
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel3.2.55 and later · before 3.3
- linux linux kernel3.4.76 and later · before 3.5
- linux linux kernel3.10.26 and later · before 3.11
- linux linux kernel3.12.7 and later · before 3.13
- linux linux kernel3.13.1 and later · before 5.4.277
- linux linux kernel5.5 and later · before 5.10.121
- linux linux kernel5.11 and later · before 5.15.46
- linux linux kernel5.16 and later · before 5.17.14
- linux linux kernel5.18 and later · before 5.18.3
- linux linux kernel3.13
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 4645e4ee32aee01a85bdc03348982a65c65ce216, a1192c0e5d037def6763f3873d3340615c241fe7, ae21dda05193c441bde106a4bbf88c185a68fbed, ea214c946ee77588c4313be3e9951edd25d6b270, 3.13affected
- 5946d089379a35dda0e531710b48fca05446a196 and later · before d0083459e2b6b07ebd78bea2fe684a19cc0f3d0faffected · git
- 5946d089379a35dda0e531710b48fca05446a196 and later · before 4fd58b5cf118d2d9038a0b8c9cc0e43096297686affected · git
- 5946d089379a35dda0e531710b48fca05446a196 and later · before 3c617827cd51018bc377bd2954e176920ddbcfadaffected · git
- 5946d089379a35dda0e531710b48fca05446a196 and later · before 59cf2fabbfe76de29d88dd7ae69858a25735b59faffected · git
- 5946d089379a35dda0e531710b48fca05446a196 and later · before ea6ea18b3ab0c0d7fefffb3c4d27df758b1c790aaffected · git
- 5946d089379a35dda0e531710b48fca05446a196 and later · before d36f6ed761b53933b0b4126486c10d3da7751e7faffected · git
- 3.2.55 and later · before 3.3affected · semver
- 3.4.76 and later · before 3.5affected · semver
- 3.10.26 and later · before 3.11affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 5.18.5-1 | 5.18.5-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 3.11 | Vendor (CNA) |
| Linux Linux | 3.13 | Vendor (CNA) |
| Linux Linux | 3.3 | Vendor (CNA) |
| Linux Linux | 3.5 | Vendor (CNA) |
| Linux Linux | 3c617827cd51018bc377bd2954e176920ddbcfad | Vendor (CNA) |
| Linux Linux | 4fd58b5cf118d2d9038a0b8c9cc0e43096297686 | Vendor (CNA) |
| Linux Linux | 59cf2fabbfe76de29d88dd7ae69858a25735b59f | Vendor (CNA) |
| Linux Linux | d0083459e2b6b07ebd78bea2fe684a19cc0f3d0f | Vendor (CNA) |
| Linux Linux | d36f6ed761b53933b0b4126486c10d3da7751e7f | Vendor (CNA) |
| Linux Linux | ea6ea18b3ab0c0d7fefffb3c4d27df758b1c790a | Vendor (CNA) |
| debian:linux | 5.18.5-1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-31739429 days apartcrypto: tegra - Add missing CRYPTO_ALG_ASYNC35Monitor
- CVE-2026-52952483 days apartiommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset35Monitor
- CVE-2025-39803201 days apartscsi: ufs: core: Remove WARN_ON_ONCE() call from ufshcd_uic_cmd_compl()31Monitor
- CVE-2023-52621337 days apartbpf: Check rcu_read_lock_trace_held() before calling bpf map helpers31Monitor
- CVE-2026-31398401 days apartmm/rmap: fix incorrect pte restoration for lazyfree folios31Monitor
- CVE-2026-46117456 days apartRDMA/mana: Remove user triggerable WARN_ON() in mana_ib_create_qp_rss()31Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-617 · Reachable AssertionCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/3c617827cd51018bc377bd2954e176920ddbcfad
- git.kernel.org/stable/c/4fd58b5cf118d2d9038a0b8c9cc0e43096297686
- git.kernel.org/stable/c/59cf2fabbfe76de29d88dd7ae69858a25735b59f
- git.kernel.org/stable/c/d0083459e2b6b07ebd78bea2fe684a19cc0f3d0f
- git.kernel.org/stable/c/d36f6ed761b53933b0b4126486c10d3da7751e7f
- git.kernel.org/stable/c/ea6ea18b3ab0c0d7fefffb3c4d27df758b1c790a
Vendor advisories and official records. Exploit/PoC links are deliberately left out.