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TI-2025-26992 Aliases CVE-2025-40322GHSA-hcc6-6437-vwm2

fbdev: bitblit: bound-check glyph index in bit_putcs*

Priority LOW 30Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · High
Fix status
Partial Red Hat: 45 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: fbdev: bitblit: bound-check glyph index in bit_putcs* bit_putcs_aligned()/unaligned() derived the glyph pointer from the character value masked by 0xff/0x1ff, which may exceed the actual font's glyph count and read past the end of the built-in font array. Clamp the index to the actual glyph count before computing the address. This fixes a global out-of-bounds read reported by syzbot.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00143 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.302, 5.10.247, 5.15.197 +5Red Hat: 15 advisoriesRed Hat: 45 fixed, 1 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
LinuxLinux2.6.12 and later5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.17.8, 6.18Patch availableCNA
  • Linux VendorLinux Affected 2.6.12 and later Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.17.8, 6.18 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.17.8, 6.18

Red Hat 15 advisories

  • 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-2026:2722 Released 2026-02-16 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.34.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.34.1.el9_7, kernel-64k-devel-5.14.0-611.34.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.34.1.el9_7, kernel-64k-5.14.0-611.34.1.el9_7, kernel-64k-core-5.14.0-611.34.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.34.1.el9_7, libperf-5.14.0-611.34.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.34.1.el9_7, kernel-rt-64k-5.14.0-611.34.1.el9_7, kernel-rt-64k-core-5.14.0-611.34.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.34.1.el9_7, kernel-rt-core-5.14.0-611.34.1.el9_7, kernel-rt-debug-5.14.0-611.34.1.el9_7 +9
  • RHSA-2026:2664 Released 2026-02-12 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.185.1.el8_2, kernel-4.18.0-193.185.1.el8_2, kernel-abi-whitelists-4.18.0-193.185.1.el8_2 +14
Show 12 more Red Hat advisories
  • RHSA-2026:2594 Released 2026-02-12 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.110.1.el9_4, libperf-5.14.0-427.110.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.110.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.110.1.el9_4, kernel-64k-devel-5.14.0-427.110.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.110.1.el9_4, kernel-5.14.0-427.110.1.el9_4, kernel-64k-5.14.0-427.110.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.110.1.el9_4, kernel-rt-core-5.14.0-427.110.1.el9_4, kernel-rt-debug-5.14.0-427.110.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.110.1.el9_4, kernel-rt-core-5.14.0-427.110.1.el9_4, kernel-rt-debug-5.14.0-427.110.1.el9_4 +11
  • RHSA-2026:2560 Released 2026-02-11 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.156.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.156.1.el9_2, kernel-64k-devel-5.14.0-284.156.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.156.1.el9_2, kernel-5.14.0-284.156.1.el9_2, kernel-64k-5.14.0-284.156.1.el9_2 +29
  • RHSA-2026:2583 Released 2026-02-11 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.156.1.rt14.441.el9_2, kernel-rt-core-5.14.0-284.156.1.rt14.441.el9_2, kernel-rt-debug-5.14.0-284.156.1.rt14.441.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.156.1.rt14.441.el9_2, kernel-rt-core-5.14.0-284.156.1.rt14.441.el9_2, kernel-rt-debug-5.14.0-284.156.1.rt14.441.el9_2 +11
  • RHSA-2026:2577 Released 2026-02-11 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-core-5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-debug-5.14.0-70.165.1.rt21.237.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-core-5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-debug-5.14.0-70.165.1.rt21.237.el9_0 +7
  • RHSA-2026:2573 Released 2026-02-11 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.165.1.el9_0, kernel-debug-devel-matched-5.14.0-70.165.1.el9_0, kernel-devel-5.14.0-70.165.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.165.1.el9_0, kernel-5.14.0-70.165.1.el9_0, kernel-abi-stablelists-5.14.0-70.165.1.el9_0 +14
  • RHSA-2026:2535 Released 2026-02-11 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.128.1.el8_8, kernel-4.18.0-477.128.1.el8_8, kernel-abi-stablelists-4.18.0-477.128.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.128.1.el8_8, kernel-4.18.0-477.128.1.el8_8, kernel-abi-stablelists-4.18.0-477.128.1.el8_8 +14
  • RHSA-2026:2490 Released 2026-02-11 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.179.1.el8_6, kernel-4.18.0-372.179.1.el8_6, kernel-abi-stablelists-4.18.0-372.179.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.179.1.el8_6, kernel-4.18.0-372.179.1.el8_6, kernel-abi-stablelists-4.18.0-372.179.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.179.1.el8_6, kernel-4.18.0-372.179.1.el8_6, kernel-abi-stablelists-4.18.0-372.179.1.el8_6 +14
  • RHSA-2026:2352 Released 2026-02-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.86.1.el9_6, libperf-5.14.0-570.86.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.86.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.86.1.el9_6, kernel-64k-devel-5.14.0-570.86.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.86.1.el9_6, kernel-64k-5.14.0-570.86.1.el9_6, kernel-64k-core-5.14.0-570.86.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.86.1.el9_6, kernel-rt-64k-5.14.0-570.86.1.el9_6, kernel-rt-64k-core-5.14.0-570.86.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.86.1.el9_6, kernel-rt-core-5.14.0-570.86.1.el9_6, kernel-rt-debug-5.14.0-570.86.1.el9_6 +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-2026:1727 Released 2026-02-02 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.58.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.58.1.el10_0, kernel-64k-devel-6.12.0-55.58.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.58.1.el10_0, kernel-64k-6.12.0-55.58.1.el10_0, kernel-64k-core-6.12.0-55.58.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.58.1.el10_0, libperf-6.12.0-55.58.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.58.1.el10_0, kernel-rt-64k-6.12.0-55.58.1.el10_0, kernel-rt-64k-core-6.12.0-55.58.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.58.1.el10_0, kernel-rt-core-6.12.0-55.58.1.el10_0, kernel-rt-debug-6.12.0-55.58.1.el10_0 +11
  • 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 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:2594
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:2352
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:2282
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:2722
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:2573
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:2560
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:2594
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:2352
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-2026:2722
Red Hat Enterprise Linux BaseOS AUS (v. 8.2)Fixed RHSA-2026:2664
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:3360
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:2490
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2026:2490
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:2535
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2026:2573
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:2560
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:2594
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:2352
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-2026:2490
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:2535
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-2026:2722
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:1661
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2026:2577
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-2026:2722
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2026:2577
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:2583
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:2594
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:2352
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-2026:2722
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:2583
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:2594
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:2352
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-40322
  2. 2026-10-03 Alias added: GHSA-hcc6-6437-vwm2

References

Other 8

  • 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-2021-02452 Incorrect authorization in Ubuntu linux kernel 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
See all 21727 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences