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CVE-2026-98586

Unknown

Last modified

CVE-2026-98586 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: sctp: hold asoc or transport before mod_timer() in timer handlers Take the association or transport reference before rearming a timer in the timer handlers. The existing code calls mod_timer() before taking the reference needed by the rearmed timer without holding the sock lock. This creates a race with timer cleanup: if the timer is deleted after mod_timer() returns but before the reference is taken, the cleanup path can drop the timer's reference and destroy the transport or association.

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: hold asoc or transport before mod_timer() in timer handlers Take the association or transport reference before rearming a timer in the timer handlers. The existing code calls mod_timer() before taking the reference needed by the rearmed timer without holding the sock lock. This creates a race with timer cleanup: if the timer is deleted after mod_timer() returns but before the reference is taken, the cleanup path can drop the timer's reference and destroy the transport or association. The timer handler then takes a reference on the already freed object and eventually drops it, causing a refcount underflow. Hold the object before mod_timer() and drop the reference if mod_timer() reports that the timer was already pending in timer handlers. Apply the same ordering to the proto-unreachable path, which can rearm a transport timer outside the timer handlers without holding the sock lock.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f9d929026d487a988bfa12c065f892e823e5b6ab; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9d3d39da054476e7aa05cd877b93ca73a9a77434; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 27c51a9b55b227309161c903f9ecfbf022516bc2; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 35bf3b23c9a871f44c1453d85f8332be4e088dda; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < cae23ae3f7887a1cf8a75da38edcebeef695040f
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98586?
In the Linux kernel, the following vulnerability has been resolved: sctp: hold asoc or transport before mod_timer() in timer handlers Take the association or transport reference before rearming a timer in the timer handlers. The existing code calls mod_timer() before taking the reference needed by the rearmed timer without holding the sock lock. This creates a race with timer cleanup: if the timer is deleted after mod_timer() returns but before the reference is taken, the cleanup path can drop the timer's reference and destroy the transport or association. The timer handler then takes a reference on the already freed object and eventually drops it, causing a refcount underflow. Hold the object before mod_timer() and drop the reference if mod_timer() reports that the timer was already pending in timer handlers. Apply the same ordering to the proto-unreachable path, which can rearm a transport timer outside the timer handlers without holding the sock lock.
How severe is CVE-2026-98586?
Severity scoring for CVE-2026-98586 is pending analysis.
How do I fix CVE-2026-98586?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST