Improper Update of Reference Count The advisory has been revoked - it doesn't affect any version of package rtla (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS10-RTLA-21321872
- published21 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
CVE-2026-93105 (opens in a new tab)Amendment
The Centos security team deemed this advisory irrelevant for Centos:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rtla package and not the rtla package as distributed by Centos.
In the Linux kernel, the following vulnerability has been resolved:
esp: do not unref managed frag pages in esp_ssg_unref()
esp_ssg_unref() releases the page references held on the source scatterlist after the AEAD operation completes. It calls skb_page_unref() on every frag page for an out-of-place transform (req->src != req->dst), and in the error path of esp_output_tail() (already_unref == true) on the request's own scatterlist.
This is wrong when the skb carries managed frags (SKBFL_MANAGED_FRAG_REFS). Managed frags are owned by a zerocopy ubuf and the skb does not hold a per-frag page reference; io_uring SEND_ZC with a registered buffer attaches the bvec pages this way via io_sg_from_iter(). The rest of the stack honours this invariant: skb_release_data() skips the per-frag unref when SKBFL_MANAGED_FRAG_REFS is set, and skb_zcopy_managed() is the guard used at the other unref sites.
esp_ssg_unref() is missing that guard, so for a managed-frag skb it drops a page reference the skb never acquired. This can underflow the page reference count and free a page that is still in use.
Guard the function with skb_zcopy_managed() so both unref paths are skipped for managed-frag skbs, matching skb_release_data().
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2536750
- https://access.redhat.com/security/cve/CVE-2026-93105
- https://git.kernel.org/stable/c/21697720ff43b8dfa25b8e8d9ca7f56f4597fc80
- https://git.kernel.org/stable/c/26b6b14c7a0368e317a1e9fb5144ebe6f8d495cf
- https://git.kernel.org/stable/c/1ad6456898f6e6cf58be83bdb607acb1119a9cd1
- https://git.kernel.org/stable/c/201bdf10ae92e7cbd524adf8c0323e2a963d5fd7
- https://git.kernel.org/stable/c/3ec55f0c8a6a543cf660584d1346e11f6311ee59
- https://git.kernel.org/stable/c/cb375965800d474c0281a2e92c43c724fce9f463