7.8

CVE-2026-52908: RDMA: During rereg_mr ensure that REREG_ACCESS is compatible

Modified
AliasesUBUNTU-CVE-2026-52908DEBIAN-CVE-2026-52908CGA-3hq9-wh82-66f7
Published 19-06-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-52908 is a high (CVSS 7.8) Improper Authorization vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.12%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 30 · Related 30
MGASA-2026-0312OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22521-1SUSE-SU-2026:22522-1SUSE-SU-2026:22665-1SUSE-SU-2026:22666-1

Timeline

  1. 19-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA: During rereg_mr ensure that REREG_ACCESS is compatible If IB_MR_REREG_ACCESS changes from RO to RW then the umem has to be re-evaluated to ensure it is properly pinned as RW. Since the umem is hidden inside each driver's mr struct add a ib_umem_check_rereg() function that each driver has to call before processing IB_MR_REREG_ACCESS. mlx4 has to retain its duplicate ib_access_writable check because it implements IB_MR_REREG_ACCESS | IB_MR_REREG_TRANS by changing both items in place sequentially while the MR is live, so it will continue to not support this combination.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.13% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu141 products
  • linux< 6.8.0-146.146 | All versions (No fix recorded) | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1066.69 | All versions (No fix recorded) | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard6 products
  • linux-azure-6.18< 6.18.38-r0
  • linux-gcp-6.18< 6.18.38-r0
  • linux-gcp-6.18-bootc-boot-installed< 6.18.38-r0
  • linux-qemu-6.18< 6.18.38-r0
  • linux-qemu-6.18-bootc-boot-installed< 6.18.38-r0
Linux2 products
  • linux≥ b40656aa7d559adc1fe689396dc58b92a9a27286, < 09dc18894148381d3bfc550083b1236043870dce | ≥ b40656aa7d559adc1fe689396dc58b92a9a27286, < eba5df21eda0fe7418efbea2f799f8ea1b8ca94c | ≥ b40656aa7d559adc1fe689396dc58b92a9a27286, < 2904e985a2917b5dac65df82733065e78a65fc9d | ≥ b40656aa7d559adc1fe689396dc58b92a9a27286, < 50334a05a950840b39a1ce3d2a173b4183db9b3e | ≥ b40656aa7d559adc1fe689396dc58b92a9a27286, < badad6fad60def1b9805559dd81dbab3d97b82aa | 6.2
  • linux_kernel≥ 6.2, < 6.6.143 | ≥ 6.7, < 6.12.94 | ≥ 6.13, < 6.18.36 | ≥ 6.19, < 7.0.13 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5 | 7.1:rc6 | 7.1:rc7
Debian1 product
  • linux< 6.12.94-1 | < 7.0.13-1

4 vendors · 150 products

References

30 links
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