What’s Vulnerable › Vulnerabilities

CVE-2025-37839: jbd2: remove wrong sb->s_sequence check

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-09 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: jbd2: remove wrong sb->s_sequence check Journal emptiness is not determined by sb->s_sequence == 0 but rather by sb->s_start == 0 (which is set a few lines above). Furthermore 0 is a valid transaction ID so the check can spuriously trigger. Remove the invalid WARN_ON.

Affected products

• Debian Linux: 11.0
• Linux kernel: before 5.4.293; from 5.5 before 5.10.237; from 5.11 before 5.15.181; from 5.16 before 6.1.135; from 6.2 before 6.6.88; from 6.7 before 6.12.24 — fixed in 5.10.237, 5.15.181, 5.4.293, 6.1.135, 6.12.24, 6.13.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.237, 5.15.181, 5.4.293, 6.1.135. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3b4643ffaf72d7a5a357e9bf68b1775f8cfe7e77
• https://git.kernel.org/stable/c/9eaec071f111cd2124ce9a5b93536d3f6837d457
• https://git.kernel.org/stable/c/ad926f735b4d4f10768fec7d080cadeb6d075cac
• https://git.kernel.org/stable/c/b0cca357f85beb6144ab60c62dcc98508cc044bf
• https://git.kernel.org/stable/c/b479839525fe7906966cdc4b5b2afbca048558a1
• https://git.kernel.org/stable/c/c88f7328bb0fff66520fc9164f02b1d06e083c1b
• https://git.kernel.org/stable/c/c98eb9ffb1d9c98237b5e1668eee17654e129fb0
• https://git.kernel.org/stable/c/cf30432f5b3064ff85d85639c2f0106f89c566f6
• https://git.kernel.org/stable/c/e6eff39dd0fe4190c6146069cc16d160e71d1148
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

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