What’s Vulnerable › Vulnerabilities

CVE-2026-89608: ecryptfs: pass packet set buffer size to parser

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

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.

Affected products

• Linux kernel: 2.6.19 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2
• https://git.kernel.org/stable/c/329de8b9e988b152b938f09224670d97bada0b96
• https://git.kernel.org/stable/c/3bd9bb3e167a7c14a50423f6ff03ee0fb007199d
• https://git.kernel.org/stable/c/66a87559ecb26afe80ad512faf728a158e2b81da
• https://git.kernel.org/stable/c/747fd45be396a6aea3420ab657a0ab4e60185b05
• https://git.kernel.org/stable/c/749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac
• https://git.kernel.org/stable/c/e5d254e654f2311a3c4b9c791d7f216554bcd17a
• https://git.kernel.org/stable/c/e7573b0e3058c6bbdfe81673f22c09900fde9e65

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