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CVE-2026-89608

HIGHCVSS 7.1/10EPSS 0.16%

Last modified

CVE-2026-89608 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ecryptfs: pass packet set buffer size to parser ecryptfs_parse_packet_set() receives a pointer into the file header, but it calculates the remaining packet buffer size from PAGE_SIZE - 8. For version 1 headers the packet set starts later in the header, so this can overstate the available buffer. Pass the actual packet set buffer length from the caller and calculate per-packet limits from the remaining bytes in that buffer. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: ecryptfs: pass packet set buffer size to parser ecryptfs_parse_packet_set() receives a pointer into the file header, but it calculates the remaining packet buffer size from PAGE_SIZE - 8. For version 1 headers the packet set starts later in the header, so this can overstate the available buffer. Pass the actual packet set buffer length from the caller and calculate per-packet limits from the remaining bytes in that buffer. Recompute the remaining length after consuming a tag 3 packet before parsing the following tag 11 packet.

Metrics

CVSS 3.1
7.1/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS Probability
0.16%

5.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= 237fead619984cc48818fe12ee0ceada3f55b012, < e7573b0e3058c6bbdfe81673f22c09900fde9e65; >= 237fead619984cc48818fe12ee0ceada3f55b012, < 66a87559ecb26afe80ad512faf728a158e2b81da; >= 237fead619984cc48818fe12ee0ceada3f55b012, < 3bd9bb3e167a7c14a50423f6ff03ee0fb007199d; >= 237fead619984cc48818fe12ee0ceada3f55b012, < 749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac; >= 237fead619984cc48818fe12ee0ceada3f55b012, < 329de8b9e988b152b938f09224670d97bada0b96; >= 237fead619984cc48818fe12ee0ceada3f55b012, < e5d254e654f2311a3c4b9c791d7f216554bcd17a; >= 237fead619984cc48818fe12ee0ceada3f55b012, < 747fd45be396a6aea3420ab657a0ab4e60185b05; >= 237fead619984cc48818fe12ee0ceada3f55b012, < 2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2
LinuxLinux2.6.19

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89608?
In the Linux kernel, the following vulnerability has been resolved: ecryptfs: pass packet set buffer size to parser ecryptfs_parse_packet_set() receives a pointer into the file header, but it calculates the remaining packet buffer size from PAGE_SIZE - 8. For version 1 headers the packet set starts later in the header, so this can overstate the available buffer. Pass the actual packet set buffer length from the caller and calculate per-packet limits from the remaining bytes in that buffer. Recompute the remaining length after consuming a tag 3 packet before parsing the following tag 11 packet.
How severe is CVE-2026-89608?
CVE-2026-89608 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89608?
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