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TI-2025-25753 Aliases CVE-2025-38415GHSA-j3rr-hppv-g55q

Squashfs: check return result of sb_min_blocksize

Priority LOW 33CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 48 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: Squashfs: check return result of sb_min_blocksize Syzkaller reports an "UBSAN: shift-out-of-bounds in squashfs_bio_read" bug. Syzkaller forks multiple processes which after mounting the Squashfs filesystem, issues an ioctl("/dev/loop0", LOOP_SET_BLOCK_SIZE, 0x8000). Now if this ioctl occurs at the same time another process is in the process of mounting a Squashfs filesystem on /dev/loop0, the failure occurs. When this happens the following code in squashfs_fill_super() fails. ---- msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); msblk->devblksize_log2 = ffz(~msblk->devblksize); ---- sb_min_blocksize() returns 0, which means msblk->devblksize is set to 0. As a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2 is set to 64. This subsequently causes the UBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36 shift exponent 64 is too large for 64-bit type 'u64' (aka 'unsigned long long') This commit adds a check for a 0 return by sb_min_blocksize().

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00225 13th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.295, 5.10.239, 5.15.186 +5Red Hat: 17 advisoriesRed Hat: 48 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux2.6.29 and later5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15.3, 6.16Patch availableCNA
  • Linux VendorLinux Affected 2.6.29 and later Fixed in 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15.3, 6.16 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.29 to before 5.4.295; 5.5 to before 5.10.239; 5.11 to before 5.15.186; 5.16 to before 6.1.142; 6.2 to before 6.6.94; 6.7 to before 6.12.34; 6.13 to before 6.15.3VulnerableLinux
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.29 to before 5.4.295; 5.5 to before 5.10.239; 5.11 to before 5.15.186; 5.16 to before 6.1.142; 6.2 to before 6.6.94; 6.7 to before 6.12.34; 6.13 to before 6.15.3 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15.3, 6.16

Red Hat 17 advisories

  • RHSA-2026:3685 Released 2026-03-03 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.147.1.el7, kernel-3.10.0-1160.147.1.el7, kernel-abi-whitelists-3.10.0-1160.147.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.147.1.el7, kernel-tools-libs-devel-3.10.0-1160.147.1.el7
  • RHSA-2026:3634 Released 2026-03-03 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.147.1.rt56.1299.el7, kernel-rt-debug-3.10.0-1160.147.1.rt56.1299.el7, kernel-rt-debug-devel-3.10.0-1160.147.1.rt56.1299.el7 +4
  • RHSA-2026:3579 Released 2026-03-03 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.62.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.62.1.el10_0, kernel-64k-devel-6.12.0-55.62.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.62.1.el10_0, kernel-64k-6.12.0-55.62.1.el10_0, kernel-64k-core-6.12.0-55.62.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.62.1.el10_0, libperf-6.12.0-55.62.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.62.1.el10_0, kernel-rt-64k-6.12.0-55.62.1.el10_0, kernel-rt-64k-core-6.12.0-55.62.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.62.1.el10_0, kernel-rt-core-6.12.0-55.62.1.el10_0, kernel-rt-debug-6.12.0-55.62.1.el10_0 +11
Show 14 more Red Hat advisories
  • RHSA-2026:3388 Released 2026-02-26 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.187.1.el8_2, kernel-4.18.0-193.187.1.el8_2, kernel-abi-whitelists-4.18.0-193.187.1.el8_2 +14
  • RHSA-2026:3375 Released 2026-02-25 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-core-5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-5.14.0-70.167.1.rt21.239.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-core-5.14.0-70.167.1.rt21.239.el9_0, kernel-rt-debug-5.14.0-70.167.1.rt21.239.el9_0 +7
  • RHSA-2026:3360 Released 2026-02-25 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.186.1.el8_4, kernel-4.18.0-305.186.1.el8_4, kernel-abi-stablelists-4.18.0-305.186.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.186.1.el8_4, kernel-4.18.0-305.186.1.el8_4, kernel-abi-stablelists-4.18.0-305.186.1.el8_4 +14
  • RHSA-2026:3358 Released 2026-02-25 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-core-5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-5.14.0-284.158.1.rt14.443.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-core-5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-5.14.0-284.158.1.rt14.443.el9_2 +11
  • RHSA-2026:3293 Released 2026-02-25 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.167.1.el9_0, kernel-debug-devel-matched-5.14.0-70.167.1.el9_0, kernel-devel-5.14.0-70.167.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.167.1.el9_0, kernel-5.14.0-70.167.1.el9_0, kernel-abi-stablelists-5.14.0-70.167.1.el9_0 +14
  • RHSA-2026:3277 Released 2026-02-25 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.130.1.el8_8, kernel-4.18.0-477.130.1.el8_8, kernel-abi-stablelists-4.18.0-477.130.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.130.1.el8_8, kernel-4.18.0-477.130.1.el8_8, kernel-abi-stablelists-4.18.0-477.130.1.el8_8 +14
  • RHSA-2026:3267 Released 2026-02-25 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.158.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.158.1.el9_2, kernel-64k-devel-5.14.0-284.158.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.158.1.el9_2, kernel-5.14.0-284.158.1.el9_2, kernel-64k-5.14.0-284.158.1.el9_2 +29
  • RHSA-2026:3268 Released 2026-02-25 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.181.1.el8_6, kernel-4.18.0-372.181.1.el8_6, kernel-abi-stablelists-4.18.0-372.181.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.181.1.el8_6, kernel-4.18.0-372.181.1.el8_6, kernel-abi-stablelists-4.18.0-372.181.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.181.1.el8_6, kernel-4.18.0-372.181.1.el8_6, kernel-abi-stablelists-4.18.0-372.181.1.el8_6 +14
  • RHSA-2026:3088 Released 2026-02-23 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.92.1.el9_6, libperf-5.14.0-570.92.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.92.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.92.1.el9_6, kernel-64k-devel-5.14.0-570.92.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.92.1.el9_6, kernel-64k-5.14.0-570.92.1.el9_6, kernel-64k-core-5.14.0-570.92.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.92.1.el9_6, kernel-rt-64k-5.14.0-570.92.1.el9_6, kernel-rt-64k-core-5.14.0-570.92.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.92.1.el9_6, kernel-rt-core-5.14.0-570.92.1.el9_6, kernel-rt-debug-5.14.0-570.92.1.el9_6 +11
  • RHSA-2026:2766 Released 2026-02-17 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.111.1.el9_4, libperf-5.14.0-427.111.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.111.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.111.1.el9_4, kernel-64k-devel-5.14.0-427.111.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.111.1.el9_4, kernel-5.14.0-427.111.1.el9_4, kernel-64k-5.14.0-427.111.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.111.1.el9_4, kernel-rt-core-5.14.0-427.111.1.el9_4, kernel-rt-debug-5.14.0-427.111.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.111.1.el9_4, kernel-rt-core-5.14.0-427.111.1.el9_4, kernel-rt-debug-5.14.0-427.111.1.el9_4 +11
  • RHSA-2026:2282 Released 2026-02-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.35.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.35.1.el10_1, kernel-64k-devel-6.12.0-124.35.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.35.1.el10_1, kernel-64k-6.12.0-124.35.1.el10_1, kernel-64k-core-6.12.0-124.35.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.35.1.el10_1, libperf-6.12.0-124.35.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.35.1.el10_1, kernel-rt-64k-6.12.0-124.35.1.el10_1, kernel-rt-64k-core-6.12.0-124.35.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.35.1.el10_1, kernel-rt-core-6.12.0-124.35.1.el10_1, kernel-rt-debug-6.12.0-124.35.1.el10_1 +9
  • RHSA-2026:2212 Released 2026-02-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.30.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.30.1.el9_7, kernel-64k-devel-5.14.0-611.30.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.30.1.el9_7, kernel-64k-5.14.0-611.30.1.el9_7, kernel-64k-core-5.14.0-611.30.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.30.1.el9_7, libperf-5.14.0-611.30.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.30.1.el9_7, kernel-rt-64k-5.14.0-611.30.1.el9_7, kernel-rt-64k-core-5.14.0-611.30.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.30.1.el9_7, kernel-rt-core-5.14.0-611.30.1.el9_7, kernel-rt-debug-5.14.0-611.30.1.el9_7 +9
  • RHSA-2026:1662 Released 2026-02-02 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.100.1.el8_10, kernel-4.18.0-553.100.1.el8_10, kernel-abi-stablelists-4.18.0-553.100.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.100.1.el8_10
  • RHSA-2026:1661 Released 2026-02-02 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-core-4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-debug-4.18.0-553.100.1.rt7.441.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-core-4.18.0-553.100.1.rt7.441.el8_10, kernel-rt-debug-4.18.0-553.100.1.rt7.441.el8_10 +7

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:2766
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:3088
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:2282
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:2212
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:3293
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:3267
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:3579
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:2766
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:3088
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:2282
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:1662
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:2212
Red Hat Enterprise Linux BaseOS AUS (v. 8.2)Fixed RHSA-2026:3388
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:3360
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:3268
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2026:3268
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:3277
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2026:3293
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:3267
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:3579
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:2766
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:3088
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:3360
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2026:3268
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:3277
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:1662
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:2282
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:2212
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:3579
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:1661
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2026:3375
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:1661
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:2282
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:2212
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2026:3375
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:3358
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:3579
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:2766
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:3088
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:2282
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:2212
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:3358
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:3579
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:2766
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:3088
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:3685
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:3685
Red Hat Enterprise Linux for Real Time (v. 7 ELS)Fixed RHSA-2026:3634

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-38415
  2. 2026-10-03 Alias added: GHSA-j3rr-hppv-g55q

References

Patch 8

Advisory 2

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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