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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Run uname -r to see the Linux kernel release that is running now. To determine whether a CVE affects your system—and which package fixes it—also identify your Linux distribution, release, and kernel flavor, then check that distribution’s official security tracker or advisory. A kernel version string by itself is not a reliable security verdict.
Check the kernel that is running
Open a terminal and run:
uname -rThe command prints the release of the kernel currently active on the machine. For a broader system-information line, use:
uname -aThat output can help provide context, but neither command tells you whether a distribution package includes a particular security fix. Also, the running kernel may not yet reflect a recently installed kernel update; the system must be using that kernel for it to appear in uname -r. See the uname manual.
Identify the distribution, release, and kernel flavor
Before looking up a CVE, establish which distribution supplied the running kernel and which release and kernel variant the machine uses. Check the operating system’s release-identification information and package-management records. In practice, record:
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- Distribution and release, such as the specific Ubuntu or Debian release or Red Hat product.
- Kernel flavor or variant, if applicable.
- Architecture and the package or update channel in use.
These details matter because vendor advisories are specific to products and releases, and some distributions publish separate notices for kernel variants. Ubuntu’s Ubuntu Security Notices index, for example, can be filtered by release and includes notices for variants such as GKE, FIPS, and Raspberry Pi kernels.
Look up the CVE in the distribution’s official tracker
Search for the exact CVE identifier in the security portal for the distribution that supplied your kernel. Check that the record covers your product, release, and kernel flavor—not merely a similarly named upstream kernel.
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Ubuntu
Search the Ubuntu Security Notices for the CVE. Confirm the affected Ubuntu release and kernel variant, then follow the notice’s package and update guidance. Ubuntu says it issues a USN when an issue is fixed in an official Ubuntu package. For patch applicability and auditing across Ubuntu releases, its release-specific OVAL data records known vulnerabilities and fixes.
Debian
Use the Debian Security Tracker to inspect the CVE and package status for the Debian release in question. Read the release-specific status rather than assuming a result for one Debian release applies to another.
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Red Hat products
Check the Red Hat CVE database for the relevant product and CVE, then follow the linked security advisory or erratum. Red Hat’s security bulletin index brings together bulletins, diagnostic tools, and updates. Pay attention to the product-specific status and remediation notes on the CVE record.
Interpret the status and fixed-package guidance
On the vendor record, look for the affected product and release, package or kernel flavor, status, fixed package or advisory identifier, and any mitigation. Status labels are not interchangeable: Red Hat, for example, distinguishes “Affected,” “Under investigation,” “Fix deferred,” and “Will not fix.” Use the meanings defined by that vendor instead of treating the labels as universal.
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Do not decide exposure solely by comparing the release shown by uname -r with an upstream kernel version. Distributions can backport a security fix into an older-looking package while retaining their release’s kernel base. Red Hat documents this practice for its packages and warns that scanners relying only on package version can report a package incorrectly as vulnerable—or miss other product-specific context. Vendor assessments can also differ: Red Hat notes that impact and CVSS assessments may vary with shipped versions, build choices, and platforms.
There is another reason a version comparison is not enough: applicability can depend on how a kernel is used and which parts of the source tree are present. The Linux kernel CVE process documentation explains that the kernel CVE team tracks fixes by their original Git commits; automatic CVE assignment follows application of a fix to a stable kernel tree. The team does not determine whether a particular CVE applies to an individual user’s system. For that answer, use the distribution’s product-specific record.
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Apply the vendor’s fix and verify the active kernel
- Follow the advisory for your exact release. Use the distribution’s supported package-update path and install the package identified by the notice or advisory. The appropriate package can depend on the release, kernel flavor, and support channel, so there is no single update command that applies to every Linux system.
- Reboot if the update requires it. Schedule the restart according to your system’s maintenance requirements and the advisory’s instructions.
- Check the active kernel again. After the update—and after any required reboot—run
uname -r. It reports the kernel now running, not a complete record of package security status. - For fleet checks, use applicable vendor data. Ubuntu’s release-specific OVAL data can help assess patch applicability and audit whether fixes have been applied.
Avoid installing an unrelated upstream kernel simply because its version number looks newer. Use the package and update channel supported for your distribution and deployment.
What to include when asking whether a system is affected
A useful CVE question needs more than the output of uname -r. Provide the CVE identifier and the distribution, release, and kernel flavor, along with the relevant vendor-record status or advisory. When comparing systems or releases, compare the same kinds of evidence:
- The exact product, release, and kernel flavor covered by the vendor record.
- The CVE status and the fixed package or advisory identifier.
- Any mitigation offered while a fix is pending.
- The release’s support or lifecycle status.
- Whether the installed distribution package already contains a backported fix, even if its upstream base version looks older.
Security records change as vendors publish notices and update package status. Recheck the official record when making a current exposure or compliance decision; do not carry a fixed-package conclusion from one release or point in time over to another.
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