VulnerabilityPublished 19 Jul 2026Updated 6 Nov 2026

CVE-2026-64052: Linux kernel · block: bio-integrity: Fix null-ptr-deref in bio_integrity_map_user()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in 76410790f1491c8e06a451045ae223a61c652455 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in 76410790f1491c8e06a451045ae223a61c652455, 8582792cf23b3d94674d4d838f7cde9a28d0fcaf, 77c059f41e9395793917d067476f549a911d77d3 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to 76410790f1491c8e06a451045ae223a61c652455, 8582792cf23b3d94674d4d838f7cde9a28d0fcaf, 77c059f41e9395793917d067476f549a911d77d3 or 8fa244738641d95ea4d70e6f9a62778bba42a5b7.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 492c5d455969fc2e829f26ed4c83487b068f0dd7, < 76410790f1491c8e06a451045ae223a61c652455	Fixed in 76410790f1491c8e06a451045ae223a61c652455
LinuxLinux	Affected ≥ 492c5d455969fc2e829f26ed4c83487b068f0dd7, < 8582792cf23b3d94674d4d838f7cde9a28d0fcaf	Fixed in 8582792cf23b3d94674d4d838f7cde9a28d0fcaf
LinuxLinux	Affected ≥ 492c5d455969fc2e829f26ed4c83487b068f0dd7, < 77c059f41e9395793917d067476f549a911d77d3	Fixed in 77c059f41e9395793917d067476f549a911d77d3
LinuxLinux	Affected ≥ 492c5d455969fc2e829f26ed4c83487b068f0dd7, < 8fa244738641d95ea4d70e6f9a62778bba42a5b7	Fixed in 8fa244738641d95ea4d70e6f9a62778bba42a5b7
LinuxLinux	Affected =6.8	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: block: bio-integrity: Fix null-ptr-deref in bio_integrity_map_user() pin_user_pages_fast() can partially succeed and return the number of pages that were actually pinned. However, the bio_integrity_map_user() does not handle this partial pinning. This leads to a general protection fault since bvec_from_pages() dereferences an unpinned page address, which is 0. To fix this, add a check to verify that all requested memory is pinned. If partial pinning occurs, unpin the memory and return -EFAULT. Kernel Oops: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 0 PID: 1061 Comm: nvme-passthroug Not tainted 7.0.0-11783-g90957f9314e8-dirty #16 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 RIP: 0010:bio_integrity_map_user.cold+0x1b0/0x9d6

References

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