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TI-2026-55549 Aliases CVE-2026-80536GHSA-qwxm-39mx-rx8g

xfs: bounds-check buffer log item's dirty bitmap

Priority LOW 37Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 16 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: xfs: bounds-check buffer log item's dirty bitmap xlog_recover_do_reg_buffer() replays each dirty region described by a buffer log item's bitmap into the buffer read for that item: memcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT), item->ri_buf[i].iov_base, nbits << XFS_BLF_SHIFT); The destination offset (bit/nbits, from the logged dirty bitmap) and the buffer size (from the logged blf_len) are both attacker-controlled and otherwise unrelated, yet the only thing bounding the copy is an ASSERT(), which compiles away on production kernels. A crafted image logging a small blf_len together with a bitmap bit past the end of that buffer drives the memcpy() past the buffer's allocation, corrupting adjacent kernel heap during mount-time log recovery. This is reachable by anyone who can get a crafted image mounted -- the malicious-filesystem threat model XFS already guards against elsewhere. Turn the ASSERT() into a real XFS_IS_CORRUPT() check that aborts recovery of the buffer with -EFSCORRUPTED, consistent with the validate-and-fail idiom already used in xlog_recover_do_inode_buffer() and xfs_dquot_item_recover.c. xlog_recover_do_reg_buffer() therefore becomes STATIC int and its three callers propagate the error. Found and confirmed with KASAN on a CONFIG_XFS_DEBUG=n build: the crafted image trips a slab-out-of-bounds write before this change and fails recovery cleanly with -EFSCORRUPTED after it.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00142 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.267, 5.15.218, 6.1.185 +5Red Hat: 4 advisoriesRed Hat: 16 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 later5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.46, 7.1.10, 7.2Patch availableCNA
  • Linux VendorLinux Affected 2.6.12 and later Fixed in 5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.46, 7.1.10, 7.2 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 5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.46, 7.1.10, 7.2

Red Hat 4 advisories

  • RHSA-2026:88477 Released 2026-10-23 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • 10Base-SMTV kernel-modules-internal-6.12.0-211.68.1.el10_2
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.68.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.68.1.el10_2, kernel-64k-devel-6.12.0-211.68.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.68.1.el10_2, kernel-64k-6.12.0-211.68.1.el10_2, kernel-64k-core-6.12.0-211.68.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.68.1.el10_2, libperf-6.12.0-211.68.1.el10_2
    • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.68.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.68.1.el10_2, kernel-rt-64k-6.12.0-211.68.1.el10_2, kernel-rt-64k-core-6.12.0-211.68.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.68.1.el10_2, kernel-rt-core-6.12.0-211.68.1.el10_2, kernel-rt-debug-6.12.0-211.68.1.el10_2 +9
  • RHSA-2026:87805 Released 2026-10-22 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.60.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.60.1.el9_8, kernel-64k-devel-5.14.0-687.60.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.60.1.el9_8, kernel-64k-5.14.0-687.60.1.el9_8, kernel-64k-core-5.14.0-687.60.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.60.1.el9_8, libperf-5.14.0-687.60.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.60.1.el9_8, kernel-rt-64k-5.14.0-687.60.1.el9_8, kernel-rt-64k-core-5.14.0-687.60.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.60.1.el9_8, kernel-rt-core-5.14.0-687.60.1.el9_8, kernel-rt-debug-5.14.0-687.60.1.el9_8 +9
  • RHSA-2026:87375 Released 2026-10-21 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.177.1.el8_10, kernel-4.18.0-553.177.1.el8_10, kernel-abi-stablelists-4.18.0-553.177.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.177.1.el8_10
Show 1 more Red Hat advisories
  • RHSA-2026:87374 Released 2026-10-21 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.177.1.rt7.518.el8_10, kernel-rt-core-4.18.0-553.177.1.rt7.518.el8_10, kernel-rt-debug-4.18.0-553.177.1.rt7.518.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.177.1.rt7.518.el8_10, kernel-rt-core-4.18.0-553.177.1.rt7.518.el8_10, kernel-rt-debug-4.18.0-553.177.1.rt7.518.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
10Base-SMTVFixed RHSA-2026:88477
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:87805
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:87375
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:87805
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:87375
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:87805
Red Hat Enterprise Linux Hidden (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:87374
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:87374
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:87805
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:87805
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-80536
  2. 2026-10-03 Alias added: GHSA-qwxm-39mx-rx8g
  3. 2026-10-18 CISA SSVC decision points changed
  4. 2026-10-22 Fix available: RHSA-2026:87374 · Red Hat
  5. 2026-10-22 Fix available: RHSA-2026:87375 · Red Hat
  6. 2026-10-23 Fix available: RHSA-2026:87805 · Red Hat
  7. 2026-10-23 Fix available: RHSA-2026:88477 · Red Hat
  8. 2026-10-23 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9) +13 · Red Hat

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 21741 →

Sources

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