7.8

CVE-2026-31580: linux Use After Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2026-31580DEBIAN-CVE-2026-31580CGA-8p72-3h47-hrff
Published 24-04-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-31580 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.4% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 41 · Related 42
OPENSUSE-SU-2026:10703-1OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22043-1SUSE-SU-2026:22433-1SUSE-SU-2026:22458-1SUSE-SU-2026:22742-1

Timeline

  1. 24-04-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: bcache: fix cached_dev.sb_bio use-after-free and crash In our production environment, we have received multiple crash reports regarding libceph, which have caught our attention: ``` [6888366.280350] Call Trace: [6888366.280452] blk_update_request+0x14e/0x370 [6888366.280561] blk_mq_end_request+0x1a/0x130 [6888366.280671] rbd_img_handle_request+0x1a0/0x1b0 [rbd] [6888366.280792] rbd_obj_handle_request+0x32/0x40 [rbd] [6888366.280903] __complete_request+0x22/0x70 [libceph] [6888366.281032] osd_dispatch+0x15e/0xb40 [libceph] [6888366.281164] ? inet_recvmsg+0x5b/0xd0 [6888366.281272] ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph] [6888366.281405] ceph_con_process_message+0x79/0x140 [libceph] [6888366.281534] ceph_con_v1_try_read+0x5d7/0xf30 [libceph] [6888366.281661] ceph_con_workfn+0x329/0x680 [libceph] ``` After analyzing the coredump file, we found that the address of dc->sb_bio has been freed. We know that cached_dev is only freed when it is stopped. Since sb_bio is a part of struct cached_dev, rather than an alloc every time. If the device is stopped while writing to the superblock, the released address will be accessed at endio. This patch hopes to wait for sb_write to complete in cached_dev_free. It should be noted that we analyzed the cause of the problem, then tell all details to the QWEN and adopted the modifications it made.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu158 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136 | < 7.0.0-27.27
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64 | < 7.0.0-1008.8
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard10 products
  • linux-aws-6.12< 6.12.85-r0
  • linux-aws-6.18< 6.18.31-r0
  • linux-azure-6.18< 6.18.31-r0
  • linux-gcp-6.12< 6.12.85-r0
  • linux-gcp-6.18< 6.18.31-r0
Linux2 products
  • linux≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < 81f44ed8c3f54abb7561ece774ea4cca5070b2f2 | ≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < f50e7c325ab1207fe941555bcff659f6d7050572 | ≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < 9467d360be70e6ee55b0c1cd2a1f1424f57b5b85 | ≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < 47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1 | ≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < add4982510f3b7c318a2dd7438bdc9c63171e753 | ≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < 2d6965581e164fa2ba3f7652ddae5535f6336576 | ≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < 4f71c8ba2dc009042493021d94a9718fbe2ebf27 | ≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < 383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9 | ≥ cafe563591446cf80bfbc2fe3bc72a2e36cf1060, < fec114a98b8735ee89c75216c45a78e28be0f128 | 3.10
  • linux_kernel< 6.6.136 | ≥ 6.12, < 6.12.83 | ≥ 6.13, < 6.18.24 | ≥ 6.19, < 6.19.14 | ≥ 7.0, < 7.0.1
Debian1 product
  • linux< 6.1.176-1 | < 6.12.85-1 | < 6.19.14-1

4 vendors · 171 products

References

45 links
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