CVE-2025-40246

UNRATEDCVSS · not yet scored

Also known asEUVD-2025-201211 (ENISA EUVD) · GHSA-x6g9-37j8-7qh9 (GitHub Security Advisories)Source: ENISA EUVD

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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

xfs: fix out of bounds memory read error in symlink repair

xfs/286 produced this report on my test fleet:

================================================================== BUG: KFENCE: out-of-bounds read in memcpy_orig+0x54/0x110

Out-of-bounds read at 0xffff88843fe9e038 (184B right of kfence-#184): memcpy_orig+0x54/0x110 xrep_symlink_salvage_inline+0xb3/0xf0 [xfs] xrep_symlink_salvage+0x100/0x110 [xfs] xrep_symlink+0x2e/0x80 [xfs] xrep_attempt+0x61/0x1f0 [xfs] xfs_scrub_metadata+0x34f/0x5c0 [xfs] xfs_ioc_scrubv_metadata+0x387/0x560 [xfs] xfs_file_ioctl+0xe23/0x10e0 [xfs] __x64_sys_ioctl+0x76/0xc0 do_syscall_64+0x4e/0x1e0 entry_SYSCALL_64_after_hwframe+0x4b/0x53

kfence-#184: 0xffff88843fe9df80-0xffff88843fe9dfea, size=107, cache=kmalloc-128

allocated by task 3470 on cpu 1 at 263329.131592s (192823.508886s ago): xfs_init_local_fork+0x79/0xe0 [xfs] xfs_iformat_local+0xa4/0x170 [xfs] xfs_iformat_data_fork+0x148/0x180 [xfs] xfs_inode_from_disk+0x2cd/0x480 [xfs] xfs_iget+0x450/0xd60 [xfs] xfs_bulkstat_one_int+0x6b/0x510 [xfs] xfs_bulkstat_iwalk+0x1e/0x30 [xfs] xfs_iwalk_ag_recs+0xdf/0x150 [xfs] xfs_iwalk_run_callbacks+0xb9/0x190 [xfs] xfs_iwalk_ag+0x1dc/0x2f0 [xfs] xfs_iwalk_args.constprop.0+0x6a/0x120 [xfs] xfs_iwalk+0xa4/0xd0 [xfs] xfs_bulkstat+0xfa/0x170 [xfs] xfs_ioc_fsbulkstat.isra.0+0x13a/0x230 [xfs] xfs_file_ioctl+0xbf2/0x10e0 [xfs] __x64_sys_ioctl+0x76/0xc0 do_syscall_64+0x4e/0x1e0 entry_SYSCALL_64_after_hwframe+0x4b/0x53

CPU: 1 UID: 0 PID: 1300113 Comm: xfs_scrub Not tainted 6.18.0-rc4-djwx #rc4 PREEMPT(lazy) 3d744dd94e92690f00a04398d2bd8631dcef1954 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-4.module+el8.8.0+21164+ed375313 04/01/2014 ==================================================================

On further analysis, I realized that the second parameter to min() is not correct. xfs_ifork::if_bytes is the size of the xfs_ifork::if_data buffer. if_bytes can be smaller than the data fork size because:

(a) the forkoff code tries to keep the data area as large as possible (b) for symbolic links, if_bytes is the ondisk file size + 1 (c) forkoff is always a multiple of 8.

Case in point: for a single-byte symlink target, forkoff will be 8 but the buffer will only be 2 bytes long.

In other words, the logic here is wrong and we walk off the end of the incore buffer. Fix that.

CVSS v3
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the BOD 26-04 block below.

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 4, 2025

Last Modified

October 19, 2026

References (3)

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-realtime-hwe-24.04-edge (6.17.0-1008.9) @ questing2026-10-19ubuntu
ubuntulinux-tools-raspi-6.17 (6.17.0-1010.10) @ questing2026-10-19ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-19.19) @ questing2026-10-19ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1010.10) @ questing2026-10-19ubuntu
ubuntulinux-tools-realtime-hwe-24.04-edge (6.17.0-1008.9~24.04.1) @ noble2026-10-19ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1017.17) @ noble2026-10-19ubuntu
linuxKernel @ 6.12.60 (fixes >=6.10.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.63-1~bpo12+1 (8 versions)
  • every version up to 6.12.63-1: fixed in 6.12.63-1
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Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.17.9-1 (81 versions)
  • every version up to 6.17.10-1: fixed in 6.17.10-1
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All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 40× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 227 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 129 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-06 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-11-05 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-11-04 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  4. 2026-11-03 16:44 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  5. 2026-11-02 16:42 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  6. 2026-11-01 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  7. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  8. 2026-10-30 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  9. 2026-10-29 16:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  10. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  11. 2026-10-28 12:25 UTCOSV refresh
  12. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  13. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  14. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  15. 2026-10-25 16:28 UTCEG score recompute
  16. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  17. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  18. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  19. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  20. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  21. 2026-10-19 20:24 UTCEG score recompute
  22. 2026-10-19 20:24 UTCVendor advisory
  23. 2026-10-19 20:24 UTCGHSA enrichmentGHSA-x6g9-37j8-7qh9
  24. 2026-10-19 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  25. 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
Show 73 more
  1. 2026-10-18 05:34 UTCEG score recompute
  2. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  3. 2026-10-16 16:38 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  4. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  5. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  6. 2026-10-13 16:32 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  7. 2026-10-12 17:06 UTCEG score recompute
  8. 2026-10-11 20:38 UTCEG score recompute
  9. 2026-10-11 18:50 UTCEG score recompute
  10. 2026-10-11 15:26 UTCEG score recompute
  11. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  12. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  13. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  14. 2026-10-08 17:09 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  15. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  16. 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  17. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  18. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  19. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  20. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  21. 2026-10-01 06:40 UTCOSV refresh
  22. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  23. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  24. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  25. 2026-09-26 00:24 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  26. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  27. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  28. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  29. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  30. 2026-09-17 19:29 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  31. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  32. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  33. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  34. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  35. 2026-09-12 07:53 UTCOSV refresh
  36. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  37. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  38. 2026-09-10 09:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  39. 2026-09-08 21:59 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  40. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  41. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  42. 2026-09-04 05:05 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  43. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  44. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  45. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  46. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  47. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  48. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  49. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  50. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  51. 2026-08-24 13:02 UTCOSV refresh
  52. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  53. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
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  55. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  56. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  57. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  58. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  59. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  60. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.2% · 9th percentile
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  62. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  63. 2026-08-08 16:36 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  64. 2026-08-08 08:39 UTCEG score recompute
  65. 2026-08-08 08:39 UTCVendor advisory
  66. 2026-08-08 08:39 UTCGHSA enrichmentGHSA-x6g9-37j8-7qh9
  67. 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  68. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  69. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  70. 2026-08-04 10:37 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  71. 2026-08-03 10:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  72. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  73. 2026-08-01 04:15 UTCEPSS rescoreEPSS 0.2% · 7th percentile

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2025-40246?
CVE-2025-40246 is a vulnerability whose severity is not yet rated; its CVE record was published on December 4, 2025. In the Linux kernel, the following vulnerability has been resolved: xfs: fix out of bounds memory read error in symlink repair xfs/286 produced this report on my test fleet: ================================================================== BUG: KFENCE: out-of-bounds read in memcpy_orig+0x54/0x110…
When was the CVE record for CVE-2025-40246 published?
The CVE record for CVE-2025-40246 was published on December 4, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2025-40246 actively exploited?
CVE-2025-40246 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
How do I remediate CVE-2025-40246?
A fix for CVE-2025-40246 is available: update to the fixed version the vendor names in its advisory.

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