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CVE-2023-52618block/rnbd-srv: Check for unlikely string overflow

Description

In the Linux kernel, the following vulnerability has been resolved: block/rnbd-srv: Check for unlikely string overflow Since "dev_search_path" can technically be as large as PATH_MAX, there was a risk of truncation when copying it and a second string into "full_path" since it was also PATH_MAX sized. The W=1 builds were reporting this warning: drivers/block/rnbd/rnbd-srv.c: In function 'process_msg_open.isra': drivers/block/rnbd/rnbd-srv.c:616:51: warning: '%s' directive output may be truncated writing up to 254 bytes into a region of size between 0 and 4095 [-Wformat-truncation=] 616 | snprintf(full_path, PATH_MAX, "%s/%s", | ^~ In function 'rnbd_srv_get_full_path', inlined from 'process_msg_open.isra' at drivers/block/rnbd/rnbd-srv.c:721:14: drivers/block/rnbd/rnbd-srv.c:616:17: note: 'snprintf' output between 2 and 4351 bytes into a destination of size 4096 616 | snprintf(full_path, PATH_MAX, "%s/%s", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 617 | dev_search_path, dev_name); | ~~~~~~~~~~~~~~~~~~~~~~~~~~ To fix this, unconditionally check for truncation (as was already done for the case where "%SESSNAME%" was present).

Timeline

  1. ID reserved

    By Linux

  2. · 12 days later

    Published

  3. · 2 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-52618, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVDNVD · Analyzed3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (exploitation in 30 days)
0.74% · top 45% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Affected products

  • Linux · Linux

    • affected 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 – < 95bc866c11974d3e4a9d922275ea8127ff809cf7
    • affected 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 – < f6abd5e17da33eba15df2bddc93413e76c2b55f7
    • affected 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 – < af7bbdac89739e2e7380387fda598848d3b7010f
    • affected 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 – < 5b9ea86e662035a886ccb5c76d56793cba618827
    • affected 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 – < a2c6206f18104fba7f887bf4dbbfe4c41adc4339
    • affected 2de6c8de192b9341ffa5e84afe1ce6196d4eef41 – < 9e4bf6a08d1e127bcc4bd72557f2dfafc6bc7f41

  • Linux · Linux

    • affected 5.8
    • unaffected < 5.8
    • unaffected 5.10.210 – ≤ 5.10.*
    • unaffected 5.15.149 – ≤ 5.15.*
    • unaffected 6.1.77 – ≤ 6.1.*
    • unaffected 6.6.16 – ≤ 6.6.*
    • unaffected 6.7.4 – ≤ 6.7.*
    • unaffected 6.8 – ≤ *

References

References7

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .