CVE-2026-46279

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-08. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

mm/alloc_tag: clear codetag for pages allocated before page_ext initialization

Due to initialization ordering, page_ext is allocated and initialized relatively late during boot. Some pages have already been allocated and freed before page_ext becomes available, leaving their codetag uninitialized.

A clear example is in init_section_page_ext(): alloc_page_ext() calls kmemleak_alloc(). If the slab cache has no free objects, it falls back to the buddy allocator to allocate memory. However, at this point page_ext is not yet fully initialized, so these newly allocated pages have no codetag set. These pages may later be reclaimed by KASAN, which causes the warning to trigger when they are freed because their codetag ref is still empty.

Use a global array to track pages allocated before page_ext is fully initialized. The array size is fixed at 8192 entries, and will emit a warning if this limit is exceeded. When page_ext initialization completes, set their codetag to empty to avoid warnings when they are freed later.

This warning is only observed with CONFIG_MEM_ALLOC_PROFILING_DEBUG=Y and mem_profiling_compressed disabled:

[ 9.582133] ------------[ cut here ]------------ [ 9.582137] alloc_tag was not set [ 9.582139] WARNING: ./include/linux/alloc_tag.h:164 at __pgalloc_tag_sub+0x40f/0x550, CPU#5: systemd/1 [ 9.582190] CPU: 5 UID: 0 PID: 1 Comm: systemd Not tainted 7.0.0-rc4 #1 PREEMPT(lazy) [ 9.582192] Hardware name: Red Hat KVM, BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 9.582194] RIP: 0010:__pgalloc_tag_sub+0x40f/0x550 [ 9.582196] Code: 00 00 4c 29 e5 48 8b 05 1f 88 56 05 48 8d 4c ad 00 48 8d 2c c8 e9 87 fd ff ff 0f 0b 0f 0b e9 f3 fe ff ff 48 8d 3d 61 2f ed 03 <67> 48 0f b9 3a e9 b3 fd ff ff 0f 0b eb e4 e8 5e cd 14 02 4c 89 c7 [ 9.582197] RSP: 0018:ffffc9000001f940 EFLAGS: 00010246 [ 9.582200] RAX: dffffc0000000000 RBX: 1ffff92000003f2b RCX: 1ffff110200d806c [ 9.582201] RDX: ffff8881006c0360 RSI: 0000000000000004 RDI: ffffffff9bc7b460 [ 9.582202] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff3a62324 [ 9.582203] R10: ffffffff9d311923 R11: 0000000000000000 R12: ffffea0004001b00 [ 9.582204] R13: 0000000000002000 R14: ffffea0000000000 R15: ffff8881006c0360 [ 9.582206] FS: 00007ffbbcf2d940(0000) GS:ffff888450479000(0000) knlGS:0000000000000000 [ 9.582208] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 9.582210] CR2: 000055ee3aa260d0 CR3: 0000000148b67005 CR4: 0000000000770ef0 [ 9.582211] PKRU: 55555554 [ 9.582212] Call Trace: [ 9.582213] [ 9.582214] ? __pfx___pgalloc_tag_sub+0x10/0x10 [ 9.582216] ? check_bytes_and_report+0x68/0x140 [ 9.582219] __free_frozen_pages+0x2e4/0x1150 [ 9.582221] ? __free_slab+0xc2/0x2b0 [ 9.582224] qlist_free_all+0x4c/0xf0 [ 9.582227] kasan_quarantine_reduce+0x15d/0x180 [ 9.582229] __kasan_slab_alloc+0x69/0x90 [ 9.582232] kmem_cache_alloc_noprof+0x14a/0x500 [ 9.582234] do_getname+0x96/0x310 [ 9.582237] do_readlinkat+0x91/0x2f0 [ 9.582239] ? __pfx_do_readlinkat+0x10/0x10 [ 9.582240] ? get_random_bytes_user+0x1df/0x2c0 [ 9.582244] __x64_sys_readlinkat+0x96/0x100 [ 9.582246] do_syscall_64+0xce/0x650 [ 9.582250] ? __x64_sys_getrandom+0x13a/0x1e0 [ 9.582252] ? __pfx___x64_sys_getrandom+0x10/0x10 [ 9.582254] ? do_syscall_64+0x114/0x650 [ 9.582255] ? ksys_read+0xfc/0x1d0 [ 9.582258] ? __pfx_ksys_read+0x10/0x10 [ 9.582260] ? do_syscall_64+0x114/0x650 [ 9.582262] ? do_syscall_64+0x114/0x650 [ 9.582264] ? __pfx_fput_close_sync+0x10/0x10 [ 9.582266] ? file_close_fd_locked+0x178/0x2a0 [ 9.582268] ? __x64_sys_faccessat2+0x96/0x100 [ 9.582269] ? __x64_sys_close+0x7d/0xd0 [ 9.582271] ? do_syscall_64+0x114/0x650 [ 9.582273] ? do_syscall_64+0x114/0x650 [ 9.582275] ? clear_bhb_loop+0x50/0xa0 [ 9.582277] ? clear_bhb_l ---truncated---

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
The EG Score, 7.8 of 10.
Exploitation0% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability30% × 15%
EchelonGraph's default: CISA has not published Automatable for this CVE.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

Published

June 8, 2026

Last Modified

July 8, 2026

Advisory Details (3)

Auto-updated Jul 8, 2026
Patch available.
generic

mm/alloc_tag: clear codetag for pages allocated before page_ext initialization - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d5b495ba9de0423ef39f8bd86729a885870c7efe
generic

mm/alloc_tag: clear codetag for pages allocated before page_ext initialization - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b49dfabc38cad5e50af24f63edd124a10de3ebb6
generic

mm/alloc_tag: clear codetag for pages allocated before page_ext initialization - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6b1842775a460245e97d36d3a67d0cfba7c4ff79

Vendor Advisories for CVE-2026-46279(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-27.27) @ resolute2026-09-14ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1013.13) @ resolute2026-09-14ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-14ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1008.8) @ resolute2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1014.14) @ resolute2026-09-14ubuntu
linuxKernel @ 6.18.27 (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
linux6.12.100-1 ... 7.2~rc7-1~exp1 (181 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.4-1~bpo13+1 (135 versions)
  • every version up to 7.0.4-1: fixed in 7.0.4-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

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 / 26× 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 100 of 255 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. None are among the latest 100 rows. The 155 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  7. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  8. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  9. 2026-10-03 10:39 UTCOSV refresh
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  13. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  14. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  15. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-09-14 04:51 UTCEG score recompute
  22. 2026-09-14 04:51 UTCVendor advisory
  23. 2026-09-14 04:51 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  25. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
Show 75 more
  1. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-08-31 01:56 UTCEG score recompute
  11. 2026-08-31 01:56 UTCVendor advisory
  12. 2026-08-31 01:56 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  13. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-08-25 01:24 UTCEG score recompute
  20. 2026-08-25 01:24 UTCVendor advisory
  21. 2026-08-25 01:24 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-08-24 00:51 UTCVendor advisory
  23. 2026-08-24 00:51 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  24. 2026-08-23 11:51 UTCEG score recompute
  25. 2026-08-23 11:51 UTCVendor advisory
  26. 2026-08-23 11:51 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  27. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  28. 2026-08-22 01:42 UTCEG score recompute
  29. 2026-08-22 01:42 UTCVendor advisory
  30. 2026-08-22 01:42 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  31. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  32. 2026-08-21 12:42 UTCEG score recompute
  33. 2026-08-21 12:42 UTCVendor advisory
  34. 2026-08-21 12:42 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  35. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  36. 2026-08-20 22:30 UTCVendor advisory
  37. 2026-08-20 22:30 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  38. 2026-08-20 09:30 UTCEG score recompute
  39. 2026-08-20 09:30 UTCVendor advisory
  40. 2026-08-20 09:30 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  41. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  42. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  43. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  44. 2026-08-17 03:26 UTCVendor advisory
  45. 2026-08-17 03:26 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  46. 2026-08-16 14:26 UTCEG score recompute
  47. 2026-08-16 14:26 UTCVendor advisory
  48. 2026-08-16 14:26 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  49. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  50. 2026-08-16 01:14 UTCVendor advisory
  51. 2026-08-16 01:14 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  52. 2026-08-15 11:59 UTCEG score recompute
  53. 2026-08-15 11:59 UTCVendor advisory
  54. 2026-08-15 11:59 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  55. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  56. 2026-08-14 17:04 UTCVendor advisory
  57. 2026-08-14 17:04 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  58. 2026-08-14 04:04 UTCEG score recompute
  59. 2026-08-14 04:04 UTCVendor advisory
  60. 2026-08-14 04:04 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  61. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  62. 2026-08-13 15:04 UTCVendor advisory
  63. 2026-08-13 15:04 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  64. 2026-08-13 02:00 UTCEG score recompute
  65. 2026-08-13 02:00 UTCVendor advisory
  66. 2026-08-13 02:00 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  67. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  68. 2026-08-12 13:00 UTCVendor advisory
  69. 2026-08-12 13:00 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  70. 2026-08-11 23:22 UTCEG score recompute
  71. 2026-08-11 23:22 UTCVendor advisory
  72. 2026-08-11 23:22 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8
  73. 2026-08-11 10:22 UTCEG score recompute
  74. 2026-08-11 10:22 UTCVendor advisory
  75. 2026-08-11 10:22 UTCGHSA enrichmentGHSA-q7fc-6xm7-37m9 · GitHub severity HIGH · GitHub CVSS 7.8

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-46279?
CVE-2026-46279 is a high vulnerability published on June 8, 2026. In the Linux kernel, the following vulnerability has been resolved: mm/alloctag: clear codetag for pages allocated before pageext initialization Due to initialization ordering, page_ext is allocated and initialized relatively late during boot. Some pages have already been allocated and freed before…
When was the CVE record for CVE-2026-46279 published?
The CVE record for CVE-2026-46279 was published on June 8, 2026. 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 July 8, 2026; the record at its source may have been updated since.
Is CVE-2026-46279 actively exploited?
CVE-2026-46279 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-46279?
CVE-2026-46279 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-46279?
A fix for CVE-2026-46279 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-46279 are linked in the Vendor Advisories panel on this page.

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