SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
A zero length gss_token results in pages == 0 and in_token->pages[0]
is NULL. The code unconditionally evaluates
page_address(in_token->pages[0]) for the initial memcpy, which can
dereference NULL even when the copy length is 0. Guard the first
memcpy so it only runs when length > 0.
Affected products
Linux · LinuxReferences
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://git.kernel.org/stable/c/1c8bb965e9b0559ff0f5690615a527c30f651dd8https://git.kernel.org/stable/c/4dedb6a11243a5c9eb9dbb97bca3c98bd725e83dhttps://git.kernel.org/stable/c/7452d53f293379e2c38cfa8ad0694aa46fc4788bhttps://git.kernel.org/stable/c/a2c6f25ab98b423f99ccd94874d655b8bcb01a19https://git.kernel.org/stable/c/a8f1e445ce3545c90d69c9e8ff8f7821825fe810https://git.kernel.org/stable/c/d4b69a6186b215d2dc1ebcab965ed88e8d41768dhttps://git.kernel.org/stable/c/f9e53f69ac3bc4ef568b08d3542edac02e83fefd