CVE-2026-53016NVD status: Modified
Linux: Out-of-bounds Write
CVE-2026-53016 is a high-severity out-of-bounds write vulnerability in Linux, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 939061b2d0f7f15114e34b4ce878ef50ff4089c3, 798d409a8949f3f495f238549b86de2886b129bd, dfb2cf434829819268fe50f41542aad318ad62b2 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.14% chance of exploitation within 30 days, which is low compared with other CVEs.
Next patch cycle
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 939061b2d0f7f15114e34b4ce878ef50ff4089c3 or 798d409a8949f3f495f238549b86de2886b129bd or dfb2cf434829819268fe50f41542aad318ad62b2 or eecee15e263ccb8cd77170a56ab6c969cb54dd6a, whichever matches your release line, or a later version.
- Update Linux Kernel to 5.10.258 or 5.15.209 or 6.1.175 or 6.6.141, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 2b789435d7f36ed918d92db647f3a2f3fec9bb1f up to, but not including, 939061b2d0f7f15114e34b4ce878ef50ff4089c3; 2b789435d7f36ed918d92db647f3a2f3fec9bb1f up to, but not including, 798d409a8949f3f495f238549b86de2886b129bd; 2b789435d7f36ed918d92db647f3a2f3fec9bb1f up to, but not including, dfb2cf434829819268fe50f41542aad318ad62b2; 2b789435d7f36ed918d92db647f3a2f3fec9bb1f up to, but not including, eecee15e263ccb8cd77170a56ab6c969cb54dd6a; 2b789435d7f36ed918d92db647f3a2f3fec9bb1f up to, but not including, bb01d8f1f385bc9034ca114d3508c7fdea24fc9a; 2b789435d7f36ed918d92db647f3a2f3fec9bb1f up to, but not including, df9784bb5b637ac80f4a2768a58ca9a50bef28a9; 2b789435d7f36ed918d92db647f3a2f3fec9bb1f up to, but not including, 227c1e1d9e2aa4cfc65ba446d5690da1f546cda4; 2b789435d7f36ed918d92db647f3a2f3fec9bb1f up to, but not including, a7a1f3cdd64d8a165d9b8c9e9ad7fb46ac19dfc4; and 1 more ranges | 939061b2d0f7f15114e34b4ce878ef50ff4089c3, 798d409a8949f3f495f238549b86de2886b129bd, dfb2cf434829819268fe50f41542aad318ad62b2, eecee15e263ccb8cd77170a56ab6c969cb54dd6a, bb01d8f1f385bc9034ca114d3508c7fdea24fc9a, df9784bb5b637ac80f4a2768a58ca9a50bef28a9 |
| Red Hat | Red Hat Enterprise Linux 9 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 6 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 7 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux AppStream (v. 10) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux AppStream E4S (v.9.2) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux AppStream E4S (v.9.4) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux AppStream EUS (v.9.6) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux AppStream (v. 9) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS (v. 10) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS (v. 8) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux BaseOS (v. 9) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE; 18 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | CNA |
| CVSS 3.1 | 7.0 | High | CNA |
Official description
In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - copy IV using skcipher ivsize AF_ALG rfc3686-ctr-aes-ccp requests pass an 8-byte IV to the driver. ccp_aes_complete() restores AES_BLOCK_SIZE bytes into the caller's IV buffer while RFC3686 skciphers expose an 8-byte IV, so the restore overruns the provided buffer. Use crypto_skcipher_ivsize() to copy only the algorithm's IV length.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer. Be wary that a language's interface to native code may still be subject to overflows, even if the language itself is theoretically safe.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Examples include the Safe C String Library (SafeStr) by Messier and Viega, and the Strsafe.h library from Microsoft. These libraries provide safer versions of overflow-prone string-handling functions.
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/227c1e1d9e2aa4cfc65ba446d5690da1f546cda4
- git.kernel.org/stable/c/798d409a8949f3f495f238549b86de2886b129bd
- git.kernel.org/stable/c/939061b2d0f7f15114e34b4ce878ef50ff4089c3
- git.kernel.org/stable/c/a7a1f3cdd64d8a165d9b8c9e9ad7fb46ac19dfc4
- git.kernel.org/stable/c/bb01d8f1f385bc9034ca114d3508c7fdea24fc9a
- git.kernel.org/stable/c/df9784bb5b637ac80f4a2768a58ca9a50bef28a9
- git.kernel.org/stable/c/dfb2cf434829819268fe50f41542aad318ad62b2
- git.kernel.org/stable/c/eecee15e263ccb8cd77170a56ab6c969cb54dd6a
Third-party and government advisories
- access.redhat.com/errata/RHSA-2026:38491Third Party Advisory
- access.redhat.com/errata/RHSA-2026:39494Third Party Advisory
- access.redhat.com/security/cve/CVE-2026-53016Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2492269Third Party Advisory
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53016.jsonThird Party Advisory
Other references
- access.redhat.com/errata/RHSA-2026:55764
- access.redhat.com/errata/RHSA-2026:55765
- access.redhat.com/errata/RHSA-2026:56574
- access.redhat.com/errata/RHSA-2026:59473
- access.redhat.com/errata/RHSA-2026:59544
- access.redhat.com/errata/RHSA-2026:61256
- access.redhat.com/errata/RHSA-2026:64767
- access.redhat.com/errata/RHSA-2026:65710
- access.redhat.com/errata/RHSA-2026:67721
- access.redhat.com/errata/RHSA-2026:67723
Recent Out-of-bounds Write vulnerabilities
- 7.8 High severity
- 9.1 Critical severity
- 7.1 High severity
- 7.8 High severity
- 9.8 Critical severity
- 7.8 High severity
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